JEMSTAR

Digital Multifunction
Electricity Meter

User Manual
Publication 1083-600
Rev. K
May 2004

AMETEK Power Instruments Tel: (585) 263-7700

255 N. Union Street Fax: (585) 262-4777
Rochester, New York 14605 Web: www.ametek.com
 Important Safety Notice
Installation, operation, and maintenance of this product can present potentially hazardous conditions if
safety procedures are not followed. To ensure that this product is used safely, it is important that you:
• Review, understand, and observe all safety notices and recommendations within this manual.
• Review your company safety procedures for meter installation and service.

DANGER!
Hazardous voltages are present during normal servicing of this device that can cause severe injury or
death. These voltages are present throughout the utility’s potential transformer (PT) and current
transformer (CT) circuits, and the meter’s connection terminals. Only qualified, properly trained
personnel should perform installation and servicing on this equipment.

© 2003 AMETEK Inc., all rights reserved.

Scientific Columbus is a trademark of AMETEK, Inc.

JEM is a registered trademark of AMETEK, Inc.
MicroJoule II is a registered trademark of AMETEK, Inc.
SC-30 is a registered trademark of AMETEK, Inc.
JEMStar, JEMWare, JEMRead are trademarks of AMETEK, Inc.
MV-90 is a trademark of Itron Energy Information Systems, Inc.
Windows is a trademark of Microsoft Corp.
MODBUS is a trademark of Schneider Systems, Inc.
Quantum is a registered trademark of Schlumberger Industries, Inc.
Digitally signed by David
Hinerman

David DN: cn=David

Hinerman, o=Ametek
Power Instruments,
c=US
Date: 2004.07.01

Signature
Not Verified
Hinerman 15:08:09 -04'00'
Reason: I am approving
this document

Power Instruments
APPROVED
 Table of Contents
General Information................................................................................................................1
JEMStar Meter Overview......................................................................................................1
Supporting Software ..........................................................................................................2
Technical Description ............................................................................................................3
Event Recording ................................................................................................................4
Model Number Description ...................................................................................................5
JEMStar Specifications..........................................................................................................6
Meter Forms ......................................................................................................................6
Measured Quantities ..........................................................................................................6
Optional Features...............................................................................................................7
Input Range Limits and Burdens .......................................................................................7
Accuracy............................................................................................................................8
Loss Compensation..........................................................................................................11
Auxiliary Power...............................................................................................................11
Temperature Operating Ranges .......................................................................................12
Frequency Range .............................................................................................................12
Clock Accuracy ...............................................................................................................12
Meter Creep .....................................................................................................................12
Analog Outputs (Option) .................................................................................................13
Pulse/Contact Alarm Outputs (Option) ...........................................................................13
Test Outputs.....................................................................................................................14
Contact Inputs (Option) ...................................................................................................14
Registers ..........................................................................................................................15
Communication Ports ......................................................................................................19
Environmental .................................................................................................................21
Agency Standards and Certification ................................................................................22

Meter Installation...................................................................................................................23
Case Styles...........................................................................................................................23
Size and Weight...............................................................................................................23
Wiring Diagrams..................................................................................................................26
External Connections...........................................................................................................38
Grounding Recommendations .........................................................................................38
Signal Inputs ....................................................................................................................38
Auxiliary Power...............................................................................................................39
Contact Inputs..................................................................................................................39
Signal Output Options .........................................................................................................41
Contact Outputs ...............................................................................................................41
Analog Outputs................................................................................................................45
Communication Ports ..........................................................................................................47
Serial Communications....................................................................................................47
Optical Port......................................................................................................................47
RS-232 .............................................................................................................................48
RS-485 .............................................................................................................................49
Modem.............................................................................................................................50
Call-Home on Power Outage...........................................................................................51
i
 Communication Repeater................................................................................................ 52
Dual Communications Option ........................................................................................ 55

Meter Operation.................................................................................................................... 59
Meter Nameplate and User Interface .................................................................................. 59
Meter Nameplate............................................................................................................. 59
Meter Configuration ....................................................................................................... 60
User Interface.................................................................................................................. 60
The JEMStar Display...................................................................................................... 61
Cold Start ............................................................................................................................ 62
Default Time Displays .................................................................................................... 62
Navigating the Display Menus............................................................................................ 63
Register Display Modes.................................................................................................. 65
Display Format and Auto-Ranging................................................................................. 67
Changing Meter Configurations.......................................................................................... 68
Display Menus .................................................................................................................... 69
VTR/CTR........................................................................................................................ 69
Service, ID, Revision ...................................................................................................... 69
Demand Intervals ............................................................................................................ 69
Date / Time ..................................................................................................................... 70
Health Status ................................................................................................................... 71
Interpreting Status Register Values in the JEMStar Display .......................................... 72
Communication Settings................................................................................................. 74
Preset Meter Registers .................................................................................................... 74
Outputs............................................................................................................................ 75
Contact Input Option ...................................................................................................... 75
Analogs ........................................................................................................................... 76
Configure ........................................................................................................................ 76

Test & Calibration ................................................................................................................ 77

Test Mode ....................................................................................................................... 77
Registration Adjustment ................................................................................................. 77
Test Mode ....................................................................................................................... 79
Enter Test Mode.............................................................................................................. 79
Exit Test Mode................................................................................................................ 79
Navigating in Test Mode ................................................................................................ 80
JEMStar Test Pulse Output............................................................................................. 82

Maintenance........................................................................................................................... 83
JEMStar Servicing .............................................................................................................. 84
Socket-base meters (S- and A-base) ............................................................................... 84
Switchboard Meters ........................................................................................................ 86
Serviceable Parts............................................................................................................. 86
Security Keys.................................................................................................................. 89
Firmware Upgrades......................................................................................................... 91
Health Diagnostics .......................................................................................................... 91
Site Diagnostics................................................................................................................... 92
Installation (Site) Verification ........................................................................................ 92
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 Installation (Site) Monitoring ..........................................................................................93

Advanced Features.................................................................................................................95
Time of Use .........................................................................................................................95
Load Profile .........................................................................................................................96
Typical Load Profile Printout ........................................................................................100
Demand Prediction ............................................................................................................101
Voltage and Current Transformer Gain Correction ...........................................................104
Voltage Sag / Swell Detection and Log.............................................................................105
Totalization ........................................................................................................................109

Appendix A JEMStar Default Settings .................................................................................1

Meter Identification ...........................................................................................................1
Primary Configuration.......................................................................................................1
Display Registers...............................................................................................................2
Load Profile .......................................................................................................................3
Time of Use Setup .............................................................................................................3
Timekeeping and DST Changes ........................................................................................3
Alarms ...............................................................................................................................3
Contact Input / Output .......................................................................................................4
Analog Outputs..................................................................................................................4
Demands ............................................................................................................................4
Serial Communication .......................................................................................................4
Display Setup.....................................................................................................................5
Passwords / Permissions ....................................................................................................5
TLC....................................................................................................................................5
Internal Modem Initialization Commands.........................................................................6

Appendix B Accessories...........................................................................................................1

Appendix C Electrostatic Discharge ......................................................................................1

Electrostatic Discharge Prevention ........................................................................................1
Failure Mode......................................................................................................................1

Appendix D DNP Serial Communications.............................................................................1

Introduction............................................................................................................................1
DNP v3.00 Device Profile .....................................................................................................2
The JEMStar Implementation................................................................................................4
IMPLEMENTATION TABLE..........................................................................................4
Binary Input Points............................................................................................................5
Counters.............................................................................................................................8
Analog Inputs ..................................................................................................................10
Events ..............................................................................................................................16
Time and Date .................................................................................................................16
Configuration...................................................................................................................16

iii
Appendix E MODBUS Communications.............................................................................. 1
MODBUS Introduction......................................................................................................... 1
Communications ............................................................................................................... 2
Serial Port Connections..................................................................................................... 2
Data Transfers using MODBUS (RTU or ASCII)............................................................ 2
LRC Calculation (ASCII mode) ....................................................................................... 3
CRC Calculation (RTU mode).......................................................................................... 3
RTU Message Framing ..................................................................................................... 4
ASCII Message Framing................................................................................................... 4
Communication Errors...................................................................................................... 4
Exception Responses ........................................................................................................ 5
Timeouts ........................................................................................................................... 5
Register Presets................................................................................................................. 6
MODBUS Register Maps ..................................................................................................... 6

Appendix F ANSI Tables Communication ........................................................................... 1

Introduction........................................................................................................................... 1
Table Organization................................................................................................................ 1
Communication Methods...................................................................................................... 2
ANSI Type 2 Optical Port Protocol (C12.18)................................................................... 2
ANSI Telephone Modem Protocol (C12.21) .................................................................... 2
ANSI Network Protocol (C12.22) .................................................................................... 2
ANSI Tables Implementation in JEMStar ............................................................................ 3
Optical Port ....................................................................................................................... 3
Modem Port ...................................................................................................................... 3
Direct-connect (RS-232 or RS-485) Port.......................................................................... 3
Supported Data Tables...................................................................................................... 4

Glossary.................................................................................................................................... 1

iv
 GENERAL INFORMATION
JEMSTAR METER OVERVIEW
The JEMStar Digital Power Meter is a multifunction electricity meter for use in revenue, survey, and
control metering applications. JEMStar is available in a variety of installation styles including Socket-
base (S-base), A-base using an adapter, and Switchboard case.

JEMStar uses DSP (Digital Signal Processing) techniques to provide advanced metering capabilities and
is intended for use in Transmission and Distribution (T&D, Tieline or Substation) and Generation
metering applications. It is also intended to serve the Commercial and Industrial (C&I) revenue metering
market.

JEMStar incorporates features common to modern electronic polyphase meters including:

• Real and reactive power and energy measurement
• Industry standard packaging
• Display of consumption, demand, and "instantaneous" registers
• Load Profile data collection and storage
• Serial data communications options for remote retrieval of registers and Load Profile data, as
well as programming
• Time of Use metering
• Pulse outputs

In addition, JEMStar offers additional features and options not found in many existing meter products:
• Apparent power and energy
• Q measurements
• Per-phase voltage, current, and phase measurements
• Summation of energy measured by external devices (Totalization)
• Loss Compensation (Transformer and Line)
• Voltage and Current Transformer Gain Correction
• Field Diagnostics
• Power Quality monitoring
• Distortion measurement
• Thermal demand emulation
• Demand prediction
• Analog outputs
• Alarm outputs
• Wide Voltage range (55 – 530V)
• 14400 Baud Modem
• Call home on power outage or alarm conditions
• Contact Inputs
• 36 sets of Self-Read registers
• Easy field-upgradeable meter firmware

Note: Certain features may require the installation of an optional module, firmware upgrade, or software
package.
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JEMStar User Manual

Supporting Software
The following packages are available for use with JEMStar:

• JEMWare Configuration Program for setting up the meter’s operation. Also contained within
JEMWare is a Site Diagnostic Tool which will:
Display the Site Diagnostic registers
Plot real time readings on a polar graph

• JEMRead Data Retrieval Program to perform the following functions:

Read and download data registers
Read and download Load Profile data
Read and download system Health and Status information
Read Self-Read Registers
Read Event Logs
Set Time of Day and Date
Perform Billing Period Reset

• UTS MV-90™1 Translation Interface Module (TIM) software that can be added to an
existing MV-90 system. This package will perform the data retrieval functions that are
normally assigned by JEMRead. For further information, contact AMETEK, or go to the
web at www.itron.com.

1
MV-90 is a trademark of Itron Energy Information Systems, Inc.
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 Chapter 1 – General Information

TECHNICAL DESCRIPTION
JEMStar offers a large variety of meter register data that can be viewed from the meter’s display or
retrieved using serial communications. Some of the register types include consumption (summation),
peak demand, time and date of peak demand, coincident demand, average power factor, coincident power
factor, cumulative, continuous cumulative registers, and various status registers including date, time,
health status, and firmware version. JEMStar also has time-of-use capabilities, and most registers can be
associated with a particular time-of-use rate.

The meter has an internal pulse recorder for storing load-profile data. The standard meter provides
enough memory to store four channels of recorded data in 15-minute intervals for 64 days. Utilizing
fewer channels will extend the length of time data may be recorded (for example, reducing the number of
channels by ½ doubles the length of recording time). Special events such as power failures, time sets,
and demand resets are also stored in the load-profile data. This data can be retrieved through serial
communications using JEMReadTM software. Optionally, a custom Translation Interface Module (TIM)
is available for the popular MV-90TM software supplied by Itron, Inc. The JEMStar meter can also
provide analog and contact outputs for external monitoring devices.

Serial communications are performed through an optical port on the front of the meter and a
communication option board (RS-232, RS-485, or the internal modem). The meter has four levels of
password protection with assignable privileges to accommodate read-only applications. A hardware
“key” is also provided in the meter, which if removed prevents any configuration or calibration changes.

JEMStar is software configurable using JEMWare™. This software allows the meter to be scaled for
direct primary readings, demand information, register information, load-profile configuration, and time-
of-use rates. Refer to the JEMWare instruction manual 1083-602 for details on all the different
parameters that can be programmed into the JEMStar.

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JEMStar User Manual

Event Recording
JEMStar maintains records of certain events independent of the Load Profile features. JEMRead is able
to retrieve some of this information independently. However, if you need access to the data for
troubleshooting or historical purposes, it is available in the meter. Contact AMETEK for information
about using the Protocol Command Set Manual 1083-603.

All recorded events include the following information:

• A description of the type of event
• The date and time at which the event occurred
• If applicable, the time after the event

The following events are recorded:

• Power Outage: any recognizable failure of the auxiliary power is recorded with the time
when power went down, the time at which it was restored, and an indication of which voltage
inputs were live (as displayed on the potential indicators) when power went down. The five
most recent power outages are saved in memory.
• Time Set and Daylight Saving Time Change: these are recorded in the same list. They
include the time before the change, the time after the change, and an indication of whether it
was a manual (front panel or serial data) or automatic (Daylight Saving Time) change. The
five most recent time changes are recorded.
• Register Freeze: Each Freeze includes the time the Freeze was performed, as well as an
indication of whether the Freeze was manual (serial command) or automatic. The five most
recent Freezes are recorded.
• Register Preset: The most recent Register Preset is recorded with the time at which the Preset
occurred.
• Test Mode: The most recent Test Mode session is recorded with the time at which the Test
Mode session was entered and left.
• Calibration: The most recent Calibration session is recorded with the time at which the
Calibration occurred.
• Site Monitoring: The 20 most recent Site Monitoring events are recorded. Each one includes
the time at which the condition was detected as well as an indication of the detected
condition.
• Billing Period Reset: The five most recent Billing Period Reset events are recorded. Each one
includes the time at which the reset was performed and an indication of whether the reset was
automatic, a serial command, or a front-panel reset.
• Configuration: The 3 most recent Configuration events are recorded. Each one includes the
time at which the configuration occurred as well as an indication of whether it was a front-
panel or remote (serial) configuration.
• Voltage Sag / Swell: The 100 most recent voltage sags or swells detected by the meter are
logged. Each event records the minimum, maximum, and average voltage and current and the
average power factor for the duration of the event.
*Note that some events (such a power outages and freezes) are reported in the JEMRead Load Profile
download.

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 Chapter 1 – General Information

MODEL NUMBER DESCRIPTION

This user manual is applicable to a broad range of JEMStar meter options. To determine the options on
your meter, read the model number located in the center front of the meter faceplate and compare it to the
following guide.
JEMStar Model Number -
Meter Enclosure Frequency Display Current - Communication Options I/O Options
Form

05=Form 5 A= A Base 5 = 50 Hz 0 = Std. LCD 02 = Class 2 0 = None 0 = None

06=Form 6 R= Switchboard 6 = 60 Hz 1 = Backlit 10 = Class 10 1 = RS-232 1 = DI/DO
08=Form 8 S= Socket LCD Option 20 = Class 20 2 = RS-485 2 = 0-1 mA
09=Form 9 J2= JEM2 3 = Modem 3 = 0-1 mA/DI/DO
Retrofit 4 = Modem/RS-232 4 = 4-20 mA
Q= Quantum® 5 = Modem/RS-485 5 = 4-20 mA/DI/DO
Retrofit 6 = Modem/ RS-485CR 6 = 5-KYZ
7 = Modem/PHPF
8 = Modem/PHPF/RS-232
9 = Modem/PHPF/RS-485
A = Modem/PHPF/RS-485CR
B = RS-232/485 Dual Comm.

Acronym Key
DI = Digital Contact Inputs
DO = Digital Contact Outputs
CR = Communications Repeater
PHPF = Phone Home on Power Failure
KYZ = Form-C contact output

Typical Example
JS - 05R6020 – 93 - DNP
JS = JEMStar-Series meter
05 = Form 5
R = Small Switchboard (Relay) case
6 = 60 Hz operating frequency
0 = Standard LCD Display
20 = Class 20
-9 = Internal Modem with Phone Home on Power Failure, and RS-485 serial comm
3 = 0 – 1 mA Analog Output, Digital Contact Inputs, Digital Contact Outputs
-DNP = Distributed Network Protocol v3.0 option

Additional Firmware Options

• Demand Prediction
• 12 Channels Load Profile (4 are standard)
• DNP 3.0 protocol
• Modbus protocol
• Voltage Sag / Swell Detection and Logging
• External Energy Totalization

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JEMStar User Manual

JEMSTAR SPECIFICATIONS
Product specifications are subject to change. Please consult the factory for updates, improvements, and
new features.

Meter Forms
Form Number Type
Form 5 3 wire wye & delta, network
Form 6 2-1/2 element wye
Form 8 4 wire delta
Form 9 4 wire wye
Current Classes
2 Amp (.0008 – 2A)
10 Amp (.004 – 10A)
20 Amp (.004 – 20A)

Measured Quantities
Integrated quantities
Integrated quantities are power measurement quantities that are integrated over time, and which may be
accumulated. Integrated quantities are used for developing Consumption, Fixed or Sliding Window
Demand (Peak or Coincident), Load Profile, or Pulse Contact outputs.

JEMStar measures the following integrated quantities:

• Watthours delivered/received, per-phase, polyphase total
• VARhours delivered/received, per-phase, polyphase total
• VAhours delivered/received, per-phase, polyphase total
• Amphours, per-phase (up to 3 phases), polyphase total
• Qhours delivered/received, per-phase, polyphase total
• V2hours, A2hours per-phase, polyphase total
Instantaneous quantities
Instantaneous quantities are short-term average or RMS measurements of electrical characteristics in a
circuit. Instantaneous quantities are suitable for Instantaneous Registers, Thermal Demands, or analog
outputs.
JEMStar measures the following instantaneous quantities:
• Watts and VARs delivered, received, or bidirectional per-phase, polyphase
• VA delivered, received, or bidirectional per-phase, polyphase
• Q delivered, received, or bidirectional per-phase, polyphase
• Volts and Volts2 per-phase (up to 3 phases)
• System Volts (average of 2 or 3 phases depending on meter form)
• Amps per-phase, polyphase plus Neutral Current
• Amps2 per-phase, polyphase
• PF per-phase, polyphase
• Frequency
• Volts THD per-phase
• Amps THD per-phase

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 Chapter 1 – General Information

Uncompensated Quantities
JEMStar is able to simultaneously provide both uncompensated and transformer- or line-loss
compensated measurements for Watt / Watthour, VAR / VARhour, VA / VAhour, Q / Qhour, and Power
Factor quantities in Display Registers, Load Profile, and KYZ pulse outputs. Analog outputs are always
loss compensated if compensation is enabled in the meter.

Optional Features
JEMStar can be equipped with the following optional features.
• Additional 8 channels of Load Profile (4 channels included as standard)
• Demand Prediction
• External Energy Totalization
• Voltage Sag / Swell detection and logging
• Modbus and DNP communications protocols

Input Range Limits and Burdens

Current Inputs
Current Input Operation Overload Burden at TA Burden at TA
Class Range Imax S-, A-Base Switchboard
Class 2 .0008–2 A 3.0 A 0.5 VA 0.5 VA
Class 10 .004–10 A 15 A 0.5 VA 1.25 VA
Class 20 .004–20 A 30 A 0.5 VA 2.5 VA

Voltage Inputs
Vmin 55
Vmax 530
Burden* 0.5 VA @ 530V
*Does not include auxiliary power requirements.

Current Overload
1.5x rated class current continuous 20x rated class current for 1 second (250A for 1 second, Class 20
Switchboard only)

Auxiliary Power
55 – 530V
Auxiliary Power Burden
15 VA maximum, 10 VA typical (normally derived from A-phase voltage input on S-base and A-base
meters)

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JEMStar User Manual

Accuracy
The nominal conditions referenced in the specifications are defined as follows:
VINPUT = Nominal Input Voltage
TA = Test Amperes = ½ Class Amps
ICLASS = Meter Class Current
Full Scale = ICLASS x VINPUT

Class 10 and 20:

Class 10 Input Current Class 20 Input Current Accuracy (PF=1) Accuracy (PF=0.5 lag)
0.07 % RD 0.1 % RD
Watthours 0.5 to 10 A 0.5 to 20 A
(0.03% RD typical)
(per phase, 0.2 % RD
polyphase total): 0.3 to 0.5 A 0.3 to 0.5 A 0.1 % RD
0.1 to 0.3 A 0.1 to 0.3 A 0.2 % RD 0.25 % RD
0.05 to 0.1 A 0.05 to 0.1 A 0.25 % RD

Class 10 Input Current Class 20 Input Current Accuracy (PF=0) Accuracy (PF=0.5 lag)
VARhours 0.5 to 10 A 0.5 to 20 A 0.2 % RD 0.2 % RD
(per phase, 0.3 to 0.5 A 0.3 to 0.5 A 0.2 % RD 0.3 % RD
polyphase total): 0.35 % RD
0.1 to 0.3 A 0.1 to 0.3 A 0.3 % RD
0.05 to 0.1 A 0.05 to 0.1 A 0.35 % RD

Class 10 Input Current Class 20 Input Current Accuracy (PF=1) Accuracy (PF=0.5 lag)
VAhours, 0.2 % RD
0.5 to 10 A 0.5 to 20 A 0.2 % RD
Qhours
0.3 to 0.5 A 0.3 to 0.5 A 0.2 % RD 0.3 % RD
(per phase,
polyphase total): 0.1 to 0.3 A 0.1 to 0.3 A 0.3 % RD 0.35 % RD
0.05 to 0.1 A 0.05 to 0.1 A 0.35 % RD

Class 10 Input Current Class 20 Input Current Accuracy (PF=1) Accuracy (PF=0.5 lag)
Instantaneous 0.15 % RD
0.5 to 10 A 0.5 to 20 A 0.15 % RD
Watts (per
0.3 to 0.5 A 0.3 to 0.5 A 0.15 % RD 0.25 % RD
phase,
polyphase total): 0.1 to 0.3 A 0.1 to 0.3 A 0.25 % RD 0.3 % RD
0.05 to 0.1 A 0.05 to 0.1 A 0.3 % RD

Class 10 Input Current Class 20 Input Current Accuracy (PF=0) Accuracy (PF=0.5 lag)
Instantaneous 0.25 % RD
0.5 to 10 A 0.5 to 20 A 0.25 % RD
Vars
0.3 to 0.5 A 0.3 to 0.5 A 0.25 % RD 0.35 % RD
(per phase,
polyphase total): 0.1 to 0.3 A 0.1 to 0.3 A 0.35 % RD 0.4 % RD
0.05 to 0.1 A 0.05 to 0.1 A 0.4 % RD

Class 10 Input Current Class 20 Input Current Accuracy (PF=1) Accuracy (PF=0.5 lag)
Instantaneous 0.25 % RD
0.5 to 10 A 0.5 to 20 A 0.25 % RD
VA, Q (per
0.3 to 0.5 A 0.3 to 0.5 A 0.25 % RD 0.35 % RD
phase,
polyphase total): 0.1 to 0.3 A 0.1 to 0.3 A 0.35 % RD 0.4 % RD
0.05 to 0.1 A 0.05 to 0.1 A 0.4 % RD

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 Chapter 1 – General Information

Class 2:
Class 2 Input Current Accuracy (PF=1) Accuracy (PF=0.5 lag)
Watthours 0.1 to 2 A 0.1 % RD 0.1 % RD
(per phase, 0.05 to 0.1 A 0.1 % RD 0.2 % RD
polyphase total): 0.4 % RD
0.025 to 0.05 A 0.2 % RD
0.01 to 0.025 A 0.3 % RD 0.5 % RD

Class 2 Input Current Accuracy (PF=0) Accuracy (PF=0.5 lag)

Varhours 0.1 to 2 A 0.2 % RD 0.2 % RD
(per phase, 0.05 to 0.1 A 0.2 % RD 0.3 % RD
polyphase total): 0.5 % RD
0.025 to 0.05 A 0.3 % RD
0.01 to 0.025 A 0.4 % RD 0.6 % RD

Class 2 Input Current Accuracy (PF=1) Accuracy (PF=0.5 lag)

VAhours, Qhours 0.1 to 2 A 0.2 % RD 0.2 % RD
(per phase, 0.05 to 0.1 A 0.2 % RD 0.3 % RD
polyphase total): 0.5 % RD
0.025 to 0.05 A 0.3 % RD
0.01 to 0.025 A 0.4 % RD 0.6 % RD

Class 2 Input Current Accuracy (PF=1) Accuracy (PF=0.5 lag)

Instantaneous Watts (per 0.1 to 2 A 0.15 % RD 0.15 % RD
phase, 0.05 to 0.1 A 0.15 % RD 0.25 % RD
polyphase total): 0.45 % RD
0.025 to 0.05 A 0.25 % RD
0.01 to 0.025 A 0.35 % RD 0.55 % RD

Class 2 Input Current Accuracy (PF=0) Accuracy (PF=0.5 lag)

Instantaneous Vars 0.1 to 2 A 0.25 % RD 0.25 % RD
(per phase, 0.05 to 0.1 A 0.25 % RD 0.35 % RD
polyphase total): 0.55 % RD
0.025 to 0.05 A 0.35 % RD
0.01 to 0.025 A 0.45 % RD 0.65% RD

Class 2 Input Current Accuracy (PF=1) Accuracy (PF=0.5 lag)

Instantaneous VA, Q (per 0.1 to 2 A 0.25 % RD 0.25 % RD
phase, 0.05 to 0.1 A 0.25 % RD 0.35 % RD
polyphase total): 0.55 % RD
0.025 to 0.05 A 0.35 % RD
0.01 to 0.025 A 0.45 % RD 0.65% RD

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JEMStar User Manual

Class 2, 10, 20
Instantaneous Volts Class 2 Class 10 Class 20
(per phase, 0.15 % RD 0.15 % RD 0.15 % RD
polyphase total):

Instantaneous Amps Class 2 Class 10 Class 20

(per phase, 0.05 % RD 0.05 % RD 0.05 % RD
polyphase total): + 0.025 % Iclass + 0.05 % Iclass + 0.025 % Iclass

Instantaneous Volts2 Class 2 Class 10 Class 20

(per phase): 0.2 % RD 0.2 % RD 0.2 % RD

Instantaneous Amps2 Class 2 Class 10 Class 20

(per phase, 0.2 % RD 0.2 % RD 0.2 % RD
polyphase total): 2 2 2
+ 0.005 % Iclass + 0.005 % Iclass + 0.005 % Iclass

Volts2 Hours Class 2 Class 10 Class 20

(per phase): 0.2 % RD 0.2 % RD 0.2 % RD

Class 2 Class 10 Class 20

Amphours
Input Current Input Current Input Current Accuracy
(per phase,
polyphase total): 0.1 A to 2 A 1 A to 10 A 1 A to 20 A 0.3 % RD
0.05 A to 0.1 A 0.5 A to 1 A 0.5 A to 1 A 0.6 % RD

Class 2 Class 10 Class 20

Amp2Hours Input Current Input Current Input Current Accuracy
(per phase, 2 A to 10 A 2 A to 20 A 0.3 % RD
polyphase total): 1 A to 2 A 1 A to 2 A 1.0 % RD
0.5 A to 1 A 0.5 A to 1 A 3.0 % RD

Measured Quantity (All):

Instantaneous Power
0.004 * FS / VAphase
Factor (per phase):

Instantaneous Power
Factor (system):
Form 5 0.004 * 2FS / VAsystem
Form 6, 8/9 0.004 * 3FS / VAsystem

Volts THD: 1.0 % absolute

Amps THD: 1.0 % absolute

Frequency
0.03 % RD
(phase A volts):

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 Chapter 1 – General Information

Loss Compensation
Type: Transformer Loss Compensation (TLC)
Line Loss Compensation (LLC)

Features: Separate coefficients for delivered and received power

User-configurable

Compensation Line Watt loss

Characteristics: Transformer copper Watt loss
Transformer copper VAR loss
Transformer iron Watt loss
Transformer iron VAR loss

Loss Compensation Watts, Watthours, VARs, VARhours, VA,

On Registers: VAhours, Q, Qhours, PF

NOTE: Registers, Load Profile channels, or KYZ Pulse outputs that are individually selected to be
"uncompensated" in JEMWare have the following accuracy modifications:

Class 10, 20 Class 2 current accuracy modifier (add to

current range range accuracy listed above)
0.3A to Class 0.03A to Class add 0.05% of reading
Amps Amps
up to 0.3A up to 0.03A add 0.10% of reading

For example, an uncompensated Watthour register will have an accuracy of 0.12% at 10 A and 1.0
PF. If the same register is compensated (even though no compensation is enabled in the meter
overall), that register will have an accuracy of 0.07%. See the JEMWare User Manual (document
1083-602) for details on how to select a register as "uncompensated."

Auxiliary Power
Requirements: 55 – 530 Volts AC
90 – 250 Volts DC (switchboard models only)

Source: S-base and A-base: derived from A-phase voltage input

Switchboard: separate terminals, AC or DC

Auxiliary Power Burden: 15 VA maximum; 10 VA typical

Power Factor Influence: Maximum additional error due to power factor influence is
±0.002%/P.F. for P.F. less than 0.5.

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JEMStar User Manual

Temperature Operating Ranges

External Environment - 30° C to +85° C
(- 30° C to +65° C with backlit display option)

Storage Temperature - 40° C to +85° C

Max. average temperature

coefficient for Watthour,
Qhour, and VARhour: ±75 ppm of reading / °C, from -30°C to +85°C

Frequency Range
50 Hz 45 to 55 Hz
60 Hz 55 to 65 Hz

Clock Accuracy
External tracking
(line frequency): Accuracy of the clock is directly determined by the power system
frequency, except during loss of auxiliary power to the meter.
The internal reference accuracy is applicable for that time period.

Internal tracking: 3 minutes per month maximum error (crystal referenced)

Meter Creep
The meter does not creep No pulses or registration will occur on any function that depends
on current with the current circuit open.

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 Chapter 1 – General Information

Analog Outputs (Option)

Quantity Three independent outputs

Type Factory set for either 0 – 1 mA or 4 – 20 mA

0 – 1 mA Range Source and sink up to 2.4 mA; Compliance ±10V max.
4 – 20 mA Range External 24V loop supply required

Accuracy
0 – 1 mA Range 0.1% of full scale output, derated by an additional
75 ppm of Rated Output per degree C difference from nominal
temperature of 23°C.

4 – 20 mA Range 0.1% of full scale output, derated by an additional

50 ppm of span per degree C difference from nominal temperature
of 23°C.

Usage User-configurable for any instantaneous quantity

Pulse/Contact Alarm Outputs (Option)

Pulse Outputs based on: Watthours, VARhours, VAhours, Qhours, Amphours, V2hours,
A2hours

Analog & Alarm Outputs

based on: Watts, VARs, VA, Q, Amps, Amps2, Volts, Volts2, PF, THD, and
Frequency

Quantity Four outputs using DI/DO board

Five outputs using 5-KYZ board

Type DI/DO: Two-wire, dry Form-A solid-state switching FET,

requires external wetting voltage; configurable for N.O. or N.C.
operation via JEMWare software.
5-KYZ: Three-wire, dry Form-C, solid-state switching FET,
requires external wetting voltage; configurable via JEMWare
software.

Max. open-circuit voltage 200V DC or peak AC

Max. closed-circuit
Saturation voltage drop 2.5 V at 30 mA max

Max. rated switching current 50 mA

TTL-compatible output External 4.7 kΩ pull-up to +5Vdc

Usage User-configurable to monitor:

- Any consumption quantity

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JEMStar User Manual

- Energy pulse constant (KYZ mimic)

- Site Monitor alarm
- Threshold alarm
- Demand Sync
- Voltage Sag / Swell alarm
- System Error alarm

Max. Rate of Operation 20 transitions per second

(e.g.: 10 full close/open pulse cycles per second)

Test Outputs
Type IR LEDs test outputs are provided through the optical port
transmitter, which becomes a test output when the meter is in the
test mode.

Contact Inputs (Option)

Quantity Two independent inputs

Type Two-wire, Form-A contact inputs

(require an external dc current to activate a photo transistor)

Minimum ON Voltage l0 Vdc

Maximum ON Voltage 40 Vdc
Maximum Input Current 50 mA
Maximum Pulse Rate 10 transitions per second

Usage User-configurable for:

- Pulse counter
- Interval Synchronization Pulse
- TOU Rate Override
- Status Input
- Totalization input

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 Chapter 1 – General Information

Registers
Instantaneous Registers
Characteristics - Updated every 1.5 seconds
- Average of 1.5 seconds

Displayed Quantities:
Per Phase and Polyphase W Del, W Rec,, W Bidirectional, VAR Del, VAR Rec, VAR Q1,
VAR Q2, VAR Q3, VAR Q4, VAR Bidirectional, VA Del, VA
Rec, VA Bidirectional, Volts, Amps, Q Del, Q Rec, Q
Bidirectional, PF Del, PF Rec, PF Bidirectional, V2, A2
Per Phase Volts THD, Amps THD
Phase A only Frequency

Consumption Registers
Characteristics - Updated no less than every 2 seconds
- Configurable to be associated with any Time of Use (TOU)
Rate. If associated with any rate other than Total, the
Consumption Register shall accumulate only energy measured
while that rate is active

Displayed Quantities:
Per Phase and Polyphase Wh Del, Wh Rec, VARh Del, VARh Rec, VAh Del, VAh Rec,
VARh per quadrant, Ah, Qh Del, Qh Rec, V2h, A2h

Display scaling In secondary (at meter terminals) or primary (at PT / CT input)

units

Preset Any desired value that may be displayed

Register Retrieval By serial communications

Totalization Registers (optional)

Characteristics - Special-purpose Consumption registers
- Displayed quantities, scaling, preset, and register retrieval are
identical to Consumption registers.
- May be configured to add additional accumulation in response to
energy pulses received on the JEMStar’s Contact Input
channels. See the JEMWare User Manual (document 1083-602)
for details on setting up Totalization registers.

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JEMStar User Manual

Average Power Factor Registers

Characteristics Configurable to be associated with any Time of Use (TOU) Rate.
If associated with any rate other than Total, the Average PF
Register is based only on energy accumulated while that rate is
active. Average Power Factor is available only as a register.

Display Average Power Factor (PF) for the Billing Period.

Calculation The PF is calculated continuously from Watts and VAs

accumulated since the last Billing Period Reset. The
accumulators are cleared on a Billing Period Reset.

Demand (Fixed or Sliding Window) Registers

Displayed Quantities:
Per Phase and Polyphase W Del, W Rec, VAR Del, VAR Rec, VA Del, VA Rec, VAR per
quadrant, A, Q Del, Q Rec

Display scaling In secondary (at meter terminals) or primary (at PT / CT input)

units.

Demand Interval Length 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, or 60 minutes

Configurable for one or more subintervals per interval, as long as
the total interval length (number of subintervals per interval times
subinterval length) equals one of the periods listed above. No
more than 12 subintervals per interval.

Preset Any desired value that can be displayed

Register Retrieval By serial communications

Peak Demand
Displayed Quantities Normal peak, Cumulative Demand, or Continuous Cumulative
Demand

Characteristics Configurable to be associated with any Time of Use (TOU) Rate.

If associated with any rate other than Total, the Peak Demand
Register is calculated only on energy measured while that rate is
active.

Time of Peak Demand

Displayed Quantities Time or Date at which the corresponding Peak Demand occurred

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 Chapter 1 – General Information

Coincident Demand
Displayed Quantities:
Per Phase and Polyphase W Del, W Rec, VAR Del, VAR Rec, VA Del, VA Rec, VAR per
quadrant, A, Q Del, Q Rec

Display scaling In secondary (at meter terminals) or primary (at PT / CT input)

units.

Demand Interval Length Matches the corresponding Peak Demand length

Preset Any desired value that may be displayed

Register Retrieval By serial communications

Coincident Power Factor

Displayed Quantities Average PF over the Demand Interval in which a Peak Demand
was established

Thermal Demand Registers

Types Thermal Demand
Peak Thermal Demand
Time of Peak Thermal Demand

Displayed Quantities:
Per Phase and Polyphase W Del, W Rec, VAR Del, VAR Rec, VA Del, VA Rec, VAR per
quadrant, Volts, A, Q Del, Q Rec, PF
Per Phase Volts THD, Amps THD
Phase A only Frequency

Demand Prediction Registers (optional)

Displayed Quantities:
Per Phase and Polyphase W Del, W Rec, VAR Del, VAR Rec, VA Del, VA Rec,
VAR per quadrant, Amp, Q Del, Q Rec

Periodic Self-Read
Records Displayed Date and time of the Self Read
Health Status summary
Up to 4 Registering quantities

Storage Up to the 36 most recent Self Read records

Configurable for: - Every Demand (Sub)Interval Closure

- Every Hour
- Every Day
- Every Month
- Every Billing Period Reset

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JEMStar User Manual

Status Registers
Storage Time, date, firmware version, comm setting, and health status
Time of Use Registers
Description - Four season schedules
- Nine day types including each day of the week and two holiday
types
- Twenty-year calendar with up to 200 holidays specified
- Each measurement register can be associated with one of nine
time-of-use rates (A – H, and Total)
- Up to eight rate changes can be specified for each day type

Load Profile
Displayed Quantities:
Per Phase and Polyphase Wh Del, Wh Rec, VARh Del, VARh Rec, VAh Del, VAh Rec,
VARh per quadrant, Ah, Qh Del, Qh Rec, Avg. W Del, Avg. W
Rec, Avg. VAR Del, Avg. VAR Rec, Avg. VAR per quadrant

Description - Up to 12 channels of storage (four standard)

- Programmable interval length (1, 2, 3, 4, 5, 6, 10, 12, 15, 30, and
60 minutes); independent of Demand Interval
- May record optional Totalization channels as well. See
Totalization registers above.

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 Chapter 1 – General Information

Communication Ports
Optical Port
Description - Type 2, Front panel mounted
- Mating Sensor can be attached with the meter cover installed
(magnetic type), or cover removed (hanging type)
- Complies with ANSI C12.13-1991, Section 3.6
- Uses JEM Binary Protocol
- User configurable for 300 to 19200 baud

RS-232
Description - Supports Tx, Rx, Gnd, and RTS signals
- Half duplex operation
- Configurable for 300 to 38400 baud
- Mutually exclusive with RS-485 option
- Configurable for all JEMStar protocols

RS-485
Description - Supports Tx, Rx, Gnd signals
- Configurable for 300 to 38400 baud
- Mutually exclusive with RS-232 option
- Configurable for all JEMStar protocols
- Network up to 32 meters with CommRepeater option
- Recommended max. cable length: 4000 feet; actual length is
dependent upon environment

Dual Communication Option

Description - 2 independent serial ports
- User-configurable for RS-232 or RS-485
- Modem is NOT available with this option

Internal Modem Option

Description - Configurable for 300 to 14400 baud
- Configurable answer schedule
- Configurable for JEM Binary protocol

Compliance - CCITT: V.34 bis, V.34, V.32 bis, V.32, V.22 bis,V.22, and V.21
- Bell®: 212A and 103

Speeds - 14400, 9600, 2400, 1200, and 300 bps

- Industry Standard ‘AT’ command set
- V.42/MNP® protocols (Error correction: V.42, MNP® 2-4, and
MNP 10)

Data Compression V.42 bis and MNP 5

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JEMStar User Manual

Call-Home on Power Outage Modem Option

Description - Internal modem that calls up to 4 telephone numbers and
transmits a message during power failure
- User configurable phone numbers and messages

Communication Repeater
Description - Permits up to 32 meters to be grouped using a single internal
modem
- Requires the RS-485 option installed in each meter of a group

20
 Chapter 1 – General Information

Environmental
Specification:
Operable in weather, rain, and salt-spray environments as specified in ANSI Standard
C12.16: Sections 7.2 and 7.4.

Operating Temperature Range

-30º to +85 ºC continuous with no coincident solar influence.
Basic meter accuracy is derated by 75 ppm of Reading per degree C variance from nominal
23ºC.

Display Operating Range

Readable: -20 to +85 ºC with no coincident solar influence

Storage Range
Unpowered: - 40 to +85 ºC

Humidity
5 to 95% relative humidity, non-condensing

External Magnetic Fields

Compliance with ANSI Standard C12.16-1991: American National Standard for Solid-State
Electricity Meters, Section 10.2.4

RF Interference (RFI)
Compliance with ANSI Standard C12.16-1991: American National Standard for Solid-State
Electricity Meters, Section 10.2.10

Electrostatic Discharge (ESD)

Compliance with ANSI Standard C12.16-1991: American National Standard for Solid-State
Electricity Meters, Section 10.2.11

Insulation

Voltage / Current Inputs In accordance with ANSI Standard C12.16-1991: American

National Standard for Solid-State Electricity Meters, Section
10.2.1

Auxiliary Power Input: 1500 Vrms, 60Hz for 1 minute between Aux. Power
(Switchboard only) and voltage input.
2500 Vrms, 60Hz for 1 minute between Aux. Power and all other
inputs, outputs and case.

Contact Inputs 500V RMS, 60Hz for 1 minute between each contact input circuit
and any other contact input circuit
1 kV RMS, 60Hz for 1 minute between each contact input circuit
and all other circuits, terminals, and case
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JEMStar User Manual

Contact Outputs 500V RMS, 60Hz for 1 minute between each contact output
circuit and any other contact output circuit
1 kV RMS, 60Hz for 1 minute between each contact output circuit
and all other circuits, terminals, and case

Communication Ports
RS-232/RS-485: 1 kV RMS, 60Hz for 1 minute between the RS-232/485 circuits
and all other circuits, terminals, and case

Modem 1 kV RMS, 60Hz for 1 minute between the modem telephone line
circuit and all other circuits, terminals, and case

Surge Withstand (SWC)

In compliance with ANSI Standard C37.90.1-1989: IEEE Standard Surge Withstand
Capability (SWC) Tests for Protective Relays and Relay Systems: Section 2.2 (Oscillatory
SWC) and related sections

Fast Transient
In compliance with IEC Standard 687 Section 5.5.4: Fast Transient Burst Test

Agency Standards and Certification

ANSI Tested and certified to comply with ANSI Standard C12.16-1991.

IEC Tested and certified to meet or exceed IEC Standard 687 accuracy
provisions for Accuracy Class 0.2
- specifically the following sections:
4.4.4: Influence of Self Heating
4.6: Accuracy Requirements

FCC The internal modem complies with FCC Part 68

22
 METER INSTALLATION
CASE STYLES
JEMStar is available in the following case styles:

• Socket connected (S base), conforming to ANSI standard C12.10-1987, Section 5

• Small Switchboard case
• Adapter to convert S-base meter to bottom-connected (A-base) style

Size and Weight

• S base: 5.5 pounds
• Meter with A-base adapter: 7.5 pounds
• Small switchboard case: 11.5 pounds

S-Base Meter Dimensions

23
JEMStar User Manual

A-Base Mounting

A-Base Adapter Mounting Dimensions

(With S-base meter installed, total depth in front of mounting panel is 10.25”)

IMPORTANT: When installing the meter locking ring on the A-base adapter, be sure that the ground
tab on the right side of the adapter is securely fitted under the ring.

Ground tab
Ring mounted correctly
with tab underneath

24
 Chapter 2 - Installation

Switchboard Case Mounting

6.80 6.19 .44

9.13
READ

RESET

2.13

Switchboard Case Meter Dimensions

Panel Cutout Dimensions

5.69
.25 DIA.
2.84
(4 Places)

CL

8.63 8.25
CL

4.31 4.13

3.03
6.06
65595-1B

25
JEMStar User Manual

WIRING DIAGRAMS
Form 5S 2 Element 3 Wire Delta

C C A A
C A

Aux. Pwr.
B (or N)

3 Phase
3 Wire Delta

c c a a

L L
I B O
N A
E D
A

Front View
65056-002A

26
 Chapter 2 - Installation

Form 6S 2½ Element 4 Wire Wye

C A
A B C N

A C N

B
3 Phase
4 Wire Wye
Aux. Power

a b c

L L
I B O
N A
E D
C

N
65060-002A

Front View

27
JEMStar User Manual

Form 9S 3 Element 4 Wire Wye

Aux. Pwr.
A B C
C A
N
A B C N

c
a b
B
3 Phase
4 Wire Wye
a b c

B
L L
I O
N A
E C D

Front View

28
 Chapter 2 - Installation

Form 8S 3 Element 4 Wire Delta

Aux. Pwr.
A B C
A
N
A B C

N
C B
C
A b
3 PHASE
4 WIRE DELTA
A b C

B
L L
I O
N A
E C D

Front View

29
JEMStar User Manual

FORM 5A 2 ELEMENT 3 WIRE DELTA

AUX. PWR.

C A
C

C
B (OR N)

3 PHASE
3 WIRE DELTA

N
IC VC IA VA /VB IA IC

L L
I B (N) O
N A
E D
A

FRONT VIEW

30
 Chapter 2 - Installation

FORM 6A 2 1/2 ELEMENT 4 WIRE WYE

AUX. PWR.

C
C

C A

B N

A
B
3 PHASE
A 4 WIRE WYE

A C N

A B C C B A

L B L
I O
N C A
E D

FRONT VIEW

31
JEMStar User Manual

FORM 8A/9A 3 ELEMENT 4 WIRE WYE

AUX. PWR.

C A

B N

B
A
3 PHASE
4 WIRE WYE

A B C N

A B C

L B L
I O
N C A
E D

FRONT VIEW

32
 Chapter 2 - Installation

FORM 8A/9A 3 ELEMENT 4 WIRE DELTA

AUX. PWR.

N
C B

A
3 PHASE
4 WIRE DELTA

A B C N

A B C C B A

L B L
I O
N C A
E D

FRONT VIEW

33
JEMStar User Manual

5R Switchboard 2 Element 3 Wire Delta

C A
LINE
A B C

B (or N)

1 3 25 27
3 Phase
2 4 26 28 3 Wire Delta

Aux. Aux. Power can be:

Pwr.
55 - 530 VAC
or
c a
90 - 250 VDC
(Both are non-polarity sensitive).
a
c

9 7 5 3 1
C C A A

10 8 6 4 2
c c a a

Shorting
Contacts

65076-2C

A B C
LOAD Back View

34
 Chapter 2 - Installation

6R Switchboard 2½ Element 4 Wire Wye

LINE C A
N A B C
N

1 3 25 27

2 4
B
26 28
3 Phase
4 Wire Wye

Aux. Power can be:

Aux.
Pwr. 55 - 530 VAC
or
c a 90 - 250 VDC
(Both are non-polarity sensitive).

c b a

9 7 5 3 1
C C B A A
10 8 6 4 2
c c b a a

Shorting Contacts

65078-003A

N A B C Back View
LOAD

35
JEMStar User Manual

9R Switchboard 3 Element 4 Wire Wye

LINE
N A B C C A
N

1 3 25 27 B
2 4
3 Phase
26 28
4 Wire Wye

Aux.
Pwr. Aux. Power can be:
55 - 530 VAC
or
90 - 250 VDC
(Both are non-polarity sensitive).

Caution:
This is a 3-element meter
in a small switchboard
9 7 5 3 1 case and is not pin-for-pin
B C B A A compatible with the
10 8 6 4 2 20-terminal M1 standard
C c b a N connections.

Shorting Contacts

N A B C
65571-002D
LOAD Back View

36
 Chapter 2 - Installation

Form 8R Wiring Diagram 4-wire Delta

LINE
A B C A
N

C B

1 3 25 27 3 Phase
4
4 Wire Delta
2 26 28

Aux. Power can be:

Aux.
55 - 530 VAC
Pwr.
or
90 - 250 VDC
(Both are non-polarity sensitive).

Caution:
This is a 3-element meter
in a small switchboard
9 7 5 3 1 case and is not pin-for-pin
B C B A A compatible with the
10 8 6 4 2 20-terminal M1 standard
C c b a N connections.

Shorting Contacts

N A B C
6571-003__D
LOAD Back View

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JEMStar User Manual

EXTERNAL CONNECTIONS
JEMStar uses industry-standard power connector configurations consistent with the standards listed in
the Specifications section. JEMStar Switchboard Case power connectors will accept 12 gauge solid wire
or a ring or spade lug.

Connections that are intended to be made and broken during normal meter operation (e.g. temporary data
connections, Test Pulse pickup, etc.) are accessible without exposing the operator to live power terminals
or conductors.

Other JEMStar electrical connections (e.g. Contact Outputs, Contact Inputs, Modem) are brought outside
the meter as pigtail leads (S-base, A-base) of an appropriate wire gauge and insulation to maintain the
electrical requirements of ANSI standards. The Switchboard model provides user connections on rear-
mounted terminal blocks.

Reading the Wire Colors

All output wires are individually color coded to simplify identification of each signal. Each wire can
have one, two, or three colors. The sequence of colors is read as follows:
• Body insulation is the first color
• Heavy stripe is the second color
• Thin tracer stripe is the third color

Body/Heavy Stripe/Tracer Stripe

Grounding Recommendations
It is important to ensure that all conductive outer surfaces of the JEMStar meter are properly grounded.
The S-base and A-base models are constructed with plastic housings, so this is not a concern, however
the Switchboard case is steel and must have a good protective ground. Supply an adequate, low-
impedance ground to the JEMStar case and verify with an ohmmeter. Be sure not to make grounding
connections on painted surfaces. All signal inputs and outputs that will be wired for extended distances
from the JEMStar should be shielded cables, with the shield grounded at one end. The instrument PT
and CT commons should be grounded consistent with your company’s wiring procedures.

Signal Inputs

Voltage Inputs
The meter will operate continuously at any voltage within the nominal range of 55 – 530 volts while still
meeting all operational specifications.

The JEMStar voltage inputs have a burden of less than 0.5 VA each. This does not include the Auxiliary
Power input, which requires less than 15 VA.

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 Chapter 2 - Installation

Current inputs
The JEMStar is configured at manufacture for one of the standard current Class ranges listed in the
Specifications section. Each JEMStar current input can withstand a continuous overload of 1.5 times the
Class current, or 20 times the Class current for 0.5 second without damage or permanent change in
registration. The JEMStar current inputs have a burden of less than 0.5 VA each.

Auxiliary Power
For S-Base and A-base models, Auxiliary Power is connected internally to the Phase A voltage input.
No separate connection is required.

The Switchboard models are designed to obtain Auxiliary Power from a separate connection. This can
be either AC or DC voltage.

• Separate AC Auxiliary Power

AC Auxiliary Power connections are connected to screw terminals on the rear of the case.
Refer to the Switchboard wiring diagrams shown just prior to this section. In this
method, the Aux. Power input will operate from 55 to 530 VAC, and is non-polarity
sensitive.

• Separate DC Auxiliary Power

DC Auxiliary Power connections use the same terminals as the AC Aux. Power. In this
method, the Aux. Power input will operate from 90 to 250 VDC, and is non-polarity
sensitive.

Contact Inputs
JEMStar can include an optional feature that consists of two Form A (N.O.) contact inputs. Each input
can be configured to perform any one of the following functions:
• Input to a pulse counter that is recorded as a channel in Load Profile. Each transition (make or
break) is counted as a pulse.
• Interval synchronization pulse. Each "make" causes the Demand Interval and / or Load Profile (if so
configured) to be re-synchronized.
• TOU Rate Override: Each "make" will cause the present Time of Use rate to change to a user-
configured “override” billing rate.
• Status Input: Each "make/break" of an external contact can be monitored by the meter and will be
logged in the Load Profile data report.
• Totalization input: Each "make" will be cause a configurable amount of energy to be added to a
Totalization register's accumulated total.
NOTE: You may encounter excessive serial communication errors if the JEMStar meter is configured to use
Totalization inputs AND the meter is receiving pulses at a high rate. While the JEMStar communication
protocol uses error checking to prevent data corruption, communication times may be extended. To
temporarily stop the interference, disconnect the contact inputs until communication is complete.

JEMStar does not provide a wetting voltage for the contact inputs; the user must provide an external
wetting source. The external source must have the following characteristics:

• Minimum ON voltage 10VDC

• Maximum ON voltage 40VDC

39
JEMStar User Manual

• Current limited to 50 mA

JEMStar will de-bounce both "make" and "break" transitions on each contact input for at least 20
milliseconds. The maximum detectable pulse rate is 10 transitions per second.

For the S-Base and A-Base meter styles, JEMStar contact input connections are provided via a multi-
conductor cable. The wire colors are as follows.

Contact Input Connections

Color Signal
Wht/Brn/Blk Din 1 -
Wht/Brn Din 1 +
Wht/Blu Din 2 -
Wht/Blu/Blk Din 2 +

For Switchboard style meters, the connections are provided on rear-mounted terminal blocks.

Switchboard Contact Input Connections

Terminal Signal
20 Din 1 -
19 Din 1 +
18 Din 2 -
17 Din 2 +

40
 Chapter 2 - Installation

SIGNAL OUTPUT OPTIONS

Contact Outputs
JEMStar can be equipped with either of two optional contact I/O boards: the DI/DO board that consists
of four Form A (N.O.) contact outputs; or the 5-KYZ board that consists of five Form C (N.O. / N.C.)
contact outputs. Note: Only one type of contact output board can be installed in a JEMStar.

DI/DO Board
Each DI/DO output can be configured to perform any one of the following functions:
• Energy pulse output: configurable for any consumption quantity or energy constant
• End of Demand Interval Output: the output will close for one second when a demand (sub) interval
closes.
• Site Monitoring Alarm output: the output will close when a Site Monitoring alarm condition is
detected.
• Threshold Alarm output: the output will close when the selected Register exceeds a user-configured
upper setpoint. The output will re-open when the Register falls below a user-configured lower
setpoint.
• Sag / Swell Alarm output: the output will close if the optional Sag / Swell Detection system
determines that a voltage sag or swell event is in progress.
• System Error Alarm output: the output will close if a meter System Error condition is present.

JEMStar does not provide a wetting voltage for the contact outputs; external wetting must be applied.
The JEMStar contact closure outputs meet the following specifications:

• Maximum open-circuit voltage is 200 volts, DC or peak AC.

• Maximum closed-circuit voltage drop is 2.5 volts at 30 mA.
• In the closed state, the contact will conduct in either direction.
• The maximum current rating for a closed contact is 50 mA.
• The contact outputs are TTL-compatible when used with an external 4700-ohm pull-up resistor to an
external +5VDC source.
• Maximum output rate is 20 transitions per second. A transition is defined as a single change of state,
either open-to-close or close-to-open. This equates to 10 complete pulse cycles per second.

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JEMStar User Manual

For the S-Base and A-Base meter styles, JEMStar contact output connections are provided via a multi-
conductor cable. The wire colors are as follows.
Contact Output Connections
Color Signal
Wht/Yel/Blk Dout 1 -
Wht/Yel Dout 1 +
Wht/Org/Blk Dout 2 -
Wht/Org Dout 2 +
Wht/Grn Dout 3 -
Wht/Grn/Blk Dout 3 +
Wht/Red Dout 4 -
Wht/Red/Blk Dout 4 +

For Switchboard style meters, the connections are provided on terminal blocks.
Switchboard Contact Output Connections
Terminal Signal
16 Dout 1 -
15 Dout 1 +
14 Dout 2 -
13 Dout 2 +
12 Dout 3 -
11 Dout 3 +
10 Dout 4 -
9 Dout 4 +

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 Chapter 2 - Installation

5-KYZ Option Board

The 5-KYZ board provides five Form-C (KYZ) contact outputs for connection to external devices. The
first four outputs operate with all the same functions as the DI/DO contact outputs, and have all the same
features and specifications (refer to the preceding section for information about output usage). The fifth
contact output can be use for any function except Threshold Alarms. The differences between the two
option boards are described below.

Feature DI/DO Board 5-KYZ Board

Number of Contact Outputs 4 5
Type of Contact Outputs Form A (N.O.) (1) Form C (N.O./N.C.)
Analog Outputs Available Yes No (2)

(1) The Form A contacts on the DI/DO Board can also be programmed for Normally Closed operation using
JEMWare software.
(2) Because all the output wires/terminals are used by contact outputs, the analog output option is not available in
conjunction with the 5-KYZ board.

Refer to JEMWare instruction manual 1083-602 for information about assigning the operating functions
of the contacts.
The following table defines the Input/Output connections for the 5-KYZ board.

Function S-BASE / A-BASE R-BASE

Wire Color Terminal Block
Din1 + WHT/BRN 19
Din1 - WHT/BRN/BLK 20
Din2 + WHT/BLU/BLK 17
Din2 - WHT/BLU 18

K1 WHT/RED/BRN 8
Y1 WHT/BLK 4
Z1 WHT/ORG/GRN 5

K2 WHT/GRY 3
Y2 WHT/ORG/BRN 6
Z2 WHT/RED/GRN 7

K3 WHT/RED 10
Y3 WHT/ORG 13
Z3 WHT/ORG/BLK 14

K4 WHT/GRN 12
Y4 WHT/GRN/BLK 11
Z4 WHT/RED/BLK 9

K5 WHT/YEL/BLK 16
Y5 WHT/YEL 15
Z5 WHT/GRN/BRN n/c *

* Relay #5 provides a single Form A (N.O.) contact in the Switchboard style (R-Base) enclosure.

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JEMStar User Manual

Configuring Contact Outputs on a 5-KYZ board

The configuration of the 5-KYZ Board is the same as setting up a DI/DO Board. However, when you set
up a contact output (in JEMWare) for Normally Open, you are setting the “K-Y” section of the output for
NO, and the “K-Z” section for NC. You may also set the output for reverse operation. That is, if you
configure JEMWare for Normally Closed, you are setting the “K-Y” section for NC, and the “K-Z”
section for NO.

Contact state shown with

JEMWare configured for
Normally Open.

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 Chapter 2 - Installation

Analog Outputs
JEMStar can include an optional feature that consists of three analog output channels. All three channels
are configured at the factory for either 0-1 mA or 4-20 mA output. Each of these channels may be
configured for any instantaneous quantity. Loss Compensation can be utilized with any Analog Output
that is based on Watts, VARs, VA, PF, or Q.

0-1 mA Outputs
A JEMStar meter equipped with 0-1 mA analog outputs has the following characteristics:
• Each output channel will source and sink up to 2.4 mA.
• Each output channel will have a compliance voltage of at least ∀10 volts.
• Analog output accuracy is 0.1% of its full scale output, and is de-rated by an additional 75 ppm of
Rated Output per degree C difference from nominal.
• The output can be configured to indicate bi-directional input quantities.

Example: +
Input Range Analog Output
- 1000 watts -1 mA
0 watts 0 mA
Aout 1 Load
+ 1000 watts +1 mA
-

0 - 1 mA Output
Connection

4-20 mA Outputs
A JEMStar meter equipped with 4-20 mA analog outputs has the following characteristics:
• Each output channel requires a separate, external loop supply of up to 24 volts.
• Analog output accuracy is 0.1% of its full scale output, and is de-rated by an additional
50 ppm of span per degree C difference from nominal.
• The outputs can also be configured to indicate bi-directional input quantities.

Example of bi-directional input range: +

Input Range Analog Output
- 1000 watts 4 mA Aout 1 Load
0 watts 12 mA 24Vdc
+ 1000 watts 20 mA - - External +
Source

4 - 20 mA Output
Connection

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JEMStar User Manual

Analog Output Connections

For the S-Base and A-Base meter styles, JEMStar analog output connections are provided via a 3-foot
multi-conductor cable. The wire colors are as follows.

S- & A-Base Analog Output Connections

Color Signal
Wht/Red/Brn Aout 1 -
Wht/Red/Grn Aout 1 +
Wht/Org/Brn Aout 2 -
Wht/Org/Grn Aout 2 +
Wht/Blk Aout 3 -
Wht/Gry Aout 3 +

For Switchboard style meters, the connections are provided on terminal blocks.

Switchboard Analog Output Connections

Terminal Signal
8 Aout 1 -
7 Aout 1 +
6 Aout 2 -
5 Aout 2 +
4 Aout 3 -
3 Aout 3 +

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 Chapter 2 - Installation

COMMUNICATION PORTS

Serial Communications
JEMStar uses JEM® Binary Protocol on all communication ports. The command set allows for the
following functions:
• Configure the meter
• Read registers
• Read Load Profile
• Check health and status
• Set the time
• Preset registers
• Perform Billing Period Reset
• Read recorded events
• Read Site Diagnostic Data
• Reload the meter register's operating firmware (remote firmware upgrade)
• Validate the user's authorization to perform certain functions. (Password protection)

Configuration commands are structured such that any one command may be used to change a
configurable item without causing the meter to stop running due to a mismatch in the total configuration.
For example, reconfiguring the TOU schedule for all Rate 1 periods without a Rate 1 register does not
cause the meter to stop functioning.

The JEMStar supports up to four passwords, three with definable privileges. The first "master" password
always has total access to meter functions. Privileges for each of the other passwords are configurable
for any or all of these categories:
• Read Normal register list
• Read Alternate register list
• Read any displayable quantity
• Set Time
• Perform Billing Reset
• Enter Test, Site Diagnostic, or Calibrate Mode
• Preset Registers
• Configure meter identity (ID strings, CT / PT ratios, etc.) and Comm parameters
• Configure TOU schedule
• Configure everything else not itemized
• Read any configuration item

Optical Port
JEMStar uses a front panel mounted Type 2 Optical Port. The physical configuration of the port is such
that a magnetic mating probe may be attached with the cover on the meter. With the cover removed, a
wire retaining clip is required. The JEMStar Optical Port incorporates JEM Binary Protocol, and may be
configured for 300, 1200, 2400, 9600 or 19200 baud communications.

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JEMStar User Manual

RS-232
The JEMStar can be optionally equipped with an RS-232 serial port. It is configurable for any valid
communication address supported by the meter, and can be configured for 300, 1200, 2400, 9600, 19.2K,
or 38.4K bps communications. The port is operated in half-duplex mode using four signal wires:
Common, Transmit Data, Receive Data, and Request To Send. The RS-232 option is mutually exclusive
with the RS-485 option; that is, only one or the other can be installed (unless the Dual Comm feature is
installed).

For the S-Base and A-Base meter styles, JEMStar serial output connections are provided via the multi-
conductor cable. The wire colors are as follows.

RS-232 Output Connections

Color Signal
Wht/Grn/Blu Tx
Wht/Red/Blu Rx
Wht/Pur Gnd
Wht/Red/Org RTS

For Switchboard style meters, the connections are provided on rear terminal blocks.

Switchboard RS-232 Connections

Terminal Signal
21 Tx
22 Rx
23 Comm Gnd
24 RTS

50 FT MAX

RS 232
MASTER
JEMSTAR
Tx METER
Rx RS 232
RTS
COMM
GND
OPTION

RS 232 CONNECTION DIAGRAM

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 Chapter 2 - Installation

RS-485
The JEMStar can be optionally equipped with RS-485 serial communications. The RS-485 port operates
in half-duplex mode (e.g.: the Transmit and Receive signals share the same wire). It is configurable for
any valid communication address supported by the meter, and can be configured for 300, 1200, 2400,
9600, 19.2K, or 38.4K bps communications. The maximum reliable distance for RS-485
communications is approximately 4000 feet, however this length can vary depending on the type of cable
used, external electrical interference, etc. The RS-485 option is mutually exclusive with the RS-232
option; that is, only one or the other can be installed (unless the Dual Comm feature is installed).

For the S-Base and A-Base meter styles, JEMStar serial output connections are provided via the multi-
conductor cable. The wire colors are as follows.

RS-485 Output Connections

Color Signal
Wht/Grn/Blu XMT/RCV +
Wht/Red/Blu XMT/RCV -

For Switchboard style meters, the connections are provided on terminal blocks.

Switchboard RS-485 Output Connections

Terminal Signal
21 XMT/RCV +
22 XMT/RCV -

4000 Ft Max

METER #1 METER #31 METER #32

JEMSTAR JEMSTAR JEMSTAR

METER METER METER

RS-485
MASTER
RS-485 RS-485 RS-485
120 W
Tx (+) / Rx (+)

120 W Tx (-) / Rx (-)

TERMINATION
RESISTOR

RS-485 CONNECTION DIAGRAM

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JEMStar User Manual

Modem
JEMStar can be optionally equipped with an internal modem. The port is configurable via JEMWare for
any communication address supported by the meter, and can be set for 300 to 14400 bits per second. A
custom initialization string can also be configured to adapt the modem to specific conditions (see
Appendix A for AT command codes).

Modem tip and ring connections for the S-base and A-base models are made using a standard four-wire
RJ-11 phone jack. For Switchboard style meters, the connections are provided on rear-mounted terminal
blocks.

Switchboard Modem Connections

Terminal Modem
Connection
2 Tip
1 Ring

Answer Modem
The JEMStar internal modem can be programmed to determine the number of rings required before
answering. An answer window, which restricts the modem to answering only during certain times of the
day, is also programmable. The modem will connect at any baud rate up to 14400 bps.

The modem can be configured for two different answering periods (number of rings) per day. When
selected, it will answer after a selected number of rings for a defined period each day, and after some
other number of rings for the rest of the day.

The modem can also detect another telephone device sharing the line going off-hook, and surrender the
line immediately, as long as the shared device is downstream of the modem.

Phone-Home Modem
The JEMStar internal modem has the capability of performing call-originate (“phone-home”) calls. The
meter can be programmed to call-originate as a result of certain events including:
• Demand Threshold
• Site Alarm
• Threshold Alarm
• Data retrieval, and on a scheduled call-in for data retrieval (as supported by MV-90)
• Power Fail (optional)

Each event can be set to call up to four different phone numbers. The modem can be configured to
transmit an ASCII text message, or a series of DTMF tones. The modem can be set up to drop into slave
mode, where it waits to be interrogated using whatever protocol the modem is configured to use.

Phone home operation calls the phone number and reports the information as a text message, without
requiring any special processing software. Once the meter establishes communications, it sends a user-
specified ASCII or DTMF response indicating the meter name and location, the time of call, and which
events occurred. This can be logged either by a computer running terminal-emulation software, or by a
serial printer connected to the modem.

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 Chapter 2 - Installation

FCC Compliance of the Internal Modem

This equipment complies with Part 68 of the FCC rules governing communications devices. On the
meter face is a label that contains the FCC registration number and Ringer Equivalence Number (REN)
for this equipment. This information must be provided to the telephone company, if requested.

This equipment should be connected to a standard RJ11 Telco jack. The REN is used to determine the
quantity of devices that may be connected to a telephone line. Excessive REN's on the telephone line
may result in the devices not ringing in response to an incoming call. In most cases, the sum of the
REN's should not exceed five. To be certain of the number of devices that may be connected to your
specific line (as determined by the number of REN's), contact your local telephone company.

If the modem causes harm to the telephone network, the telephone company will notify you as soon as
possible. In addition, you will be advised of your right to file a complaint with the FCC, should this be
necessary.

The telephone company may make changes in its facilities, equipment, operations, or procedures that
could affect the operation of the equipment. If this happens, the telephone company will provide
advance notice for you to make the necessary modifications so that your service is not interrupted.

If trouble is experienced with this modem, please contact Ametek Power Instruments for repair and
warranty information. If the trouble is affecting the telephone network, the telephone company may
request that you remove the equipment from the network until the problem is resolved. The customer
should not attempt to repair this equipment. The modem cannot be used on public coin service provided
by the telephone company. Connection to Party Line Service is subject to tariffs. Contact your state
public utility commission, public service commission, or corporation commission for information.

Call-Home on Power Outage

JEMStar can be optionally equipped with an internal modem capable of initiating telephone calls for up
to four separate telephone numbers and transmitting a message in the event of a loss of power at the
meter. The telephone numbers and message are software configurable using JEMWare. The internal
battery pack that supports this option uses long life lithium cells, however if the need arises, the batteries
can be easily replaced by removing the meter top cover (see the Maintenance section).

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JEMStar User Manual

Communication Repeater
JEMStar can be optionally equipped with a Communication Repeater option that allows a network of
meters to share a single internal modem. This feature requires the RS-485 option to be installed on all
meters connected in the network. The JEMStar CommRepeater operates as a master to slave
configuration.

Each meter in the network must be assigned a unique communication address via JEMWare
configuration software. Multiple meter connectivity is obtained through one CommRepeater master
meter and subsequent slave meters as shown in the diagram below.

MV-90

TELEPHONE LINE
(TIP / RING)
4000 Ft Max

LAST
JEMWARE MASTER SLAVE SLAVE

JEMSTAR JEMSTAR JEMSTAR

M METER METER METER
O
D
E
M

RS-485 RS-485 RS-485

120 W 120 W
Tx (+) / Rx (+)

Tx (-) / Rx (-)
JEMREAD (CONNECT UP TO 32 DEVICES)

TYPICAL COMMREPEATER DIAGRAM

The interface to the master meter must be through a phone line that is connected to the internal JEMStar
modem. Note that the slave meters (those without an internal modem) in the network cannot cause the
modem to originate a call. The daisy-chained slaves are connected in a standard RS485 configuration.
These signals are connected via the I/O cable (S and A-base), or rear-mounted terminal blocks
(switchboard case). See the previous section titled “RS-485 Connections” for wiring details. The
JEMStar CommRepeater utilizes a half-duplex communications link.
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 Chapter 2 - Installation

RS485 Operating Mode

The RS485 protocol permits up to 32 transceiver pairs to share a party line. Because RS485
communications are differential, much longer cable lengths are possible than RS-232C. The total length
of the network wiring must not exceed 4000 feet. A single twisted-pair of wires can connect up to 32
drivers and receivers for half-duplex communications.

4000 Ft Max

METER #1 METER #31 METER #32

JEMSTAR JEMSTAR JEMSTAR

METER METER METER

RS-485
MASTER
RS-485 RS-485 RS-485
120 W
Tx (+) / Rx (+)

120 W Tx (-) / Rx (-)

TERMINATION
RESISTOR

RS-485 CONNECTION DIAGRAM

The signals labeled “TX(+)/RX(+)” and “TX(-)/RX(-)” are a half-duplex pair that carry Received Data to
the meter and Transmitted Data to the master.

There are no restrictions on where the meters are connected to the wires, and it is not necessary to have
the meters connected at the ends (you may have other devices connected in the same string). However,
the wire pair must be terminated at each end with a 120-ohm resistor. If the JEMStar meters are the end
devices, this is accomplished simply by installing a jumper on the meter’s Communication board. If you
have another type of device located at the end, refer to the instruction manual for that device; you may
need to install the resistor externally.

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JEMStar User Manual

JEMSTAR CommRepeater
Termination Jumper J5 on Comm
board, shown in “terminated” position
(upper two pins shorted)
J5

The jumper is a standard 0.1” center, two-pin, female, shorting connector commonly used on most PC
motherboards. Contact Ametek Power Instruments and specify part number 4195-263, or ask your local
computer shop for replacements.

For meters that are not at the ends of the RS-485 network, place the jumper in the “unterminated”
position by plugging it onto the bottom two contacts.

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Dual Communications Option

Certain JEMSTAR applications require a SCADA type system and a retrieval system to exist
simultaneously, which require two serial communications channels. The standard JEMSTAR offers one
channel of configurable RS232/485. The Dual Communications board is an optional feature of the
JEMSTAR meter, which will allow two channels of RS232/485, each channel being user-selectable via
hardware jumpers on the circuit board. Note that the modem option is not available when using the Dual
Comm board.

The dual communications option requires the user to designate parameters for both channels as listed
below. The channels can be set up using either the meter’s front panel keypad or via JEMWare software.

Network Address
Each port may be configurable for any valid communication address as supported by the particular
protocol. An RS485 link may have no more than a maximum of 32 meters daisy-chained. See the
previous CommRepeater section of this manual for further information.

Baud Rate
Each serial port may be configured for 300, 1200, 2400, 9600, 19200, or 38400 bps communications.

Both channels are able to run the following protocols simultaneously:

JEM10 Binary
Modbus
ANSI tables
Note: DNP can only be run on one of the two channels at a time.

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JEMStar User Manual

Jumper Settings for Dual Comm Board

The Dual Communications board is different from the standard serial/modem communications board.
Use the following information when setting up the two ports.

J8: Install only one jumper in one of the four locations. This is used to define the port assignments as
RS232 or RS485. For example, the top jumper position defines both ports as RS232. Use jumper part
number 4195-263*.

P2, P3, P4: Not used, these are for factory test purposes.

P10, P11: These are 2x7 jumper packages, part number 4195-643. Install jumper on the left two
columns of pins for RS485 communications, install on the right two columns for RS232. P10 is used for
channel 1; P11 is used for channel 2.

J1, J7: Use these jumpers (4195-263*) to add the RS485 termination resistors to the circuit only when
required. Refer to the CommRepeater section for more information about when termination resistors are
required. Connecting the upper two pins will insert the termination resistor in the circuit; the lower two
pins will take it out. J1 is for channel 1; J7 is for channel 2.
Note: For RS-232 operation the termination jumper(s) (J1/J7) must be in the unterminated state

RS485 Termination Jumper J1

on the Dual Comm board,

RS485 Termination Jumper J7

on the Dual Comm board.
Shown in “terminated” position
(upper two pins shorted)
J1, J7

* The 4195-263 jumpers are standard 0.1” center, two-pin female shorting connectors commonly
used on most PC motherboards. Contact Ametek Power Instruments or ask your local computer shop
for replacements.

.
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 Chapter 2 - Installation

Dual Comm Serial Data Output Connections

The serial data (RS232 or RS485) is wired out using J3 for channel 1, and J4 used for channel 2. For the
S-Base and A-Base meter styles, Dual Comm channel 1 serial output connections are provided via the
multi-conductor cable. The wire colors are as follows.
Channel 1 S-Base, A-base Connections
Wire Color RS485 Signal RS232 Signal
Wht/Grn/Blu Xmt/Rcv + Tx
Wht/Red/Blu Xmt/Rcv - Rx
Wht/Pur Comm Gnd
Wht/Red/Org RTS

For Switchboard style meters, channel 1 connections are provided on rear terminal blocks.
Channel 1 Switchboard Connections
Rear RS485 RS232
Terminals Signal Signal
21 Xmt/Rcv + Tx
22 Xmt/Rcv - Rx
23 Comm Gnd
24 RTS

For the S-base and A-base meter styles, Dual Comm channel 2 serial output connections are brought out
on J4. A standard four-wire telephone cable is provided with an RJ-11 jack.
Channel 2 S-base, A-base Connections
J4 RS485 RS232
Pin Number Signal Signal
1 RTS
2 Xmt/Rcv + Tx
3 Xmt/Rcv - Rx
4 Comm Gnd

J4 Front View

1 2 3 4

For Switchboard style meters, channel 2 connections are provided on rear terminal blocks. Note: RTS is
not available on channel 2 of the Switchboard model.
Channel 2 Switchboard Connections
Rear RS485 RS232
Terminals Signal Signal
1 Xmt/Rcv + Tx
2 Xmt/Rcv - Rx
23 Comm Gnd

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JEMStar User Manual

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 METER OPERATION
METER NAMEPLATE AND USER INTERFACE

Meter Nameplate
The meter’s nameplate provides general information about the meter including model number, form,
class, voltage, frequency, wiring configuration (3-Wire or 4-Wire), test amps, and the Kt (test pulse
constant in WH/count). There is also an area for the user to write in the CTR (current transformer ratio),
VTR (voltage transformer ratio), and a multiply-by field.

JEMStar Front View; Globe Removed

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JEMStar User Manual

Meter Configuration
All of the parameters that determine the meter’s operation can be set by using the JEMWare
configuration software. JEMWare includes a file-management system for storing configurations,
configuration-editing screens for setting the various parameters, and communication channel setups to
program the meter. JEMWare provides the ability to read the existing configuration from the meter and
to read the time on the meter through serial communications. The JEMWare Instruction Manual 1083-
602 describes each parameter that can be programmed.

NOTE: You may use the latest version of JEMWare to open a configuration file saved with a prior
version, or to read the configuration from a JEMStar meter that was programmed with a prior version.
If you do this, however, you must verify all settings in the configuration before saving it or
programming it into a meter. Verify the settings by opening each item in the Meter Settings menu and
reviewing the settings. This allows you to be confident that the correct settings are in place and also
allows JEMWare to insert appropriate default settings for features that may not have been present in
the older version of JEMWare.

User Interface
JEMStar includes a User Interface consisting of the front panel display and keypad. The User Interface
is designed to facilitate all the tasks most commonly performed at the meter without need of a separate
computer. Some configuration functions are settable directly from the meter, while others will require
setup through the JEMWare software program.

The hardware Security Key must be installed in the Metrology board to access the keypad functions of
the meter. Refer to “Chapter 5 – Maintenance” for a complete description of the Security Key features.

The keypad, located at the right side of the meter’s faceplate, consists of seven buttons. With the meter
cover (or globe) in place, you can only press the READ button, which allows you to scroll through and
view the meter’s display registers.

The RESET button performs a Billing Period Reset and is available on a

closed meter. To use the button, you must first remove any external seals, and
then twist the button 90º clockwise to unlock it. Also, a separate Security Key
on the Metrology board is provided which can disable just the Reset button.
Refer to Chapter 5 - Maintenance for further information.

With the meter cover (or globe) removed, all configuration buttons are
accessible to the user. This allows you to enter the setup menus by pressing
any one of the four arrow buttons.

JEMStar Front Panel Controls

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 Chapter 4 – Test & Calibration

The JEMStar Display

The display is divided into several sections that are dedicated to show specific meter functions or
operations.

Annunciator Section
Potential Indicators Reactive Flow
TOU Rate Indicator
Watts Flow
Minor Display
Function Indicator
Major Display
(Register contents)

Remote Error Indicator

Communication
End of Interval Site Monitor
Thresholds (4 indicators)

JEMStar LCD Display Layout

Backlight Option
As an option, the JEMStar display can be ordered with a backlighting feature. See the Model Number
Description near the beginning of this manual to determine if your meter is equipped with this feature.

Major Display
The large 6 or 8-digit numeric display on the JEMStar is used for displaying measurement registers and
the measurement quantity. Measurement registers shown on this display are configurable for up to 3
decimal places and for 3 or more significant digits (with lead zero blanking).

Minor Display
In the upper center, the smaller 3-digit numeric display on the JEMStar is used for identification codes,
register sequence numbers, or other indications as configured by the user. For registers in user-defined
display lists, the user can assign up to a 3-digit identifier to each displayed item.

Function Indicator
This section of the display indicates information relative to the highlighted menu item. The Function
Indicator displays simple text and may be customized for each user-assigned register in JEMWare.

TOU Rate Indicator

The upper right section of the display can be programmed to indicate the Time of Use rate (A-H)
associated with any displayed measurement. Registers associated with the Total rate leave this blank.

Annunciators
The display indicates the following items as symbols; they are visible regardless of what is being
displayed on the major or minor numeric displays:
Potential Indicators
Each of the three possible voltage inputs (A, B, and C) on the JEMStar has a corresponding
Potential Indicator, shown in the upper left corner of the display. The Potential Indicator is

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JEMStar User Manual

visible whenever the corresponding voltage input exceeds 20 volts. The only time that a
Potential Indicator turns off is:

• If the corresponding voltage input is below 20 (+5, -0) volts

• If the meter Auxiliary Power is off
• If a blank display is shown
Load Rate Indicator(s)
The upper left section of the display includes a sequentially moving arrow indication of the
direction and rate of energy flow for Watts and Reactive (VAR or Q). Left to right arrows
indicates Watts delivered; right to left indicates Watts received. In a similar manner, bottom to
top arrows indicate Reactive Lagging; top to bottom indicates Reactive Leading.
End of Interval Indicator
The display provides a momentary indication of the end of a Demand Interval or Subinterval.
Upon occurrence, a flag appears in the lower left for at least one second.
Error Indicator
When the meter detects an error, a flag will appear in the lower right corner of the display.
Register Threshold 1 - 4
Appears in the bottom row when one of the user-configured Threshold conditions is exceeded.
There is a separate indicator for each of the four Threshold settings.
Site Monitor
Appears in the bottom row when one of the user-configured Site Monitor conditions is in effect.

COLD START
If JEMStar circuit boards have been replaced or software options have been installed, a cold start
procedure must be performed. A cold start erases all register and load profile data. The
communication and configuration parameters are reset to factory defaults (see Appendix A).
Upgrading JEMStar operating firmware automatically performs a cold start at the end of the upgrade
procedure. After a Cold Start is performed, the meter should be reconfigured using JEMWare
configuration software to program the meter for your specific application.

Warning!
Performing a Cold Start will cause a loss of data.
To perform a cold start:
1. Remove power from the meter, and then remove the meter globe.
2. Simultaneously press the UP and DOWN arrow buttons while applying power to the meter,
until the JEMStar logo is displayed.

Default Time Displays

When a Cold Start is performed, certain time and date displays in the meter (for example, Date of Peak
Demand) contain a default time/date until the meter records an actual value. This "non-value" displays
as midnight, January 1, 1970. In other words, a time register will show 00.00.00 and a date register will
show 01.01.70.

If you see a display with this particular time and date, please note that this is simply an indication that
the meter has not received a valid setting yet.

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NAVIGATING THE DISPLAY MENUS

In standard operation, the JEMStar display is used to show the measured electrical quantities and various
other monitored parameters. However, the display can easily be switched into the Setup mode, which
uses a simple menu structure for access to the meter’s multiple features. Some menu items are “read-
only” such as health status indicators, while others can be edited (time, date, communications, etc.).
Through a series of front panel button presses, you can directly configure many of the simpler meter
functions. Note: the front panel keypad may be “locked out”, depending on your company policy. See
Section 5 – Maintenance for information on Security Keys.

The Display Menu is divided into logical groups of features and categories. The following chart shows
all menu functions.

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JEMStar User Manual

Display Menu Layout

Menu Menu Menu Description of Operation Editable
Column 1 Column 2 Column 3 Feature

VTR <Voltage Transformer Ratio>:1 Y

CTR <Current Transformer Ratio>:1 Y
Identity Service “4Wire-Y”, “4Wire-D”, “3Wire-D”, etc. N
Program ID ID name from JEMWare N
Firmware Rev <Revision Number> N
Display Select 6-digit or 8-digit main display with leading zeroes or leading blanks Y
Interval Time in hours/minutes N
Demand
Subinterval Time in hours/minutes N
Time XX:XX:XX (24 hour format) Y
Date/Time
Date XX.XX.XX (format configured in JEMWare) Y
Battery Status “OK”, ”Warning” N
Configuration “OK”, “Error” N
Site Monitor “Normal”, “Alarm” N
Health Status Threshold 1 “Normal”, “Alarm” N
Threshold 2 “Normal”, “Alarm” N
Threshold 3 “Normal”, “Alarm” N
Settings Threshold 4 “Normal”, “Alarm” N
Address <Decimal address> Y
Optical Baud “300”, “1200”, “2400”, “9600”, “19200” Y
Protocol “Binary”, “DNP”, “Modbus”, “ANSI Tables” Y
Type “RS232”, “RS485” N
Address <Decimal address>, “Not Installed” Y
Baud “300”, “1200”, “2400”, “9600”, “19200”, “38400”, “Not Installed” Y
Serial 1 Protocol JEM 2B, DNP, Modbus RTU, Modbus ASCII, ANSI Tables, Not Installed Y
RTS ON time Time in mSec between RTS ON and Tx start Y
RTS OFF time Time in mSec between Tx end and RTS OFF Y
Turnaround Time in mSec between Tx end and Rx start (RS485 only) Y
Type “RS232”, “RS485”, “Modem” N
Address <Decimal address>, “Not Installed” Y
Baud “300”, “1200”, “2400”, “9600”, “19200”, “38400”, “Not Installed” Y
Serial 2 Protocol JEM 2B, DNP, Modbus RTU, Modbus ASCII, ANSI Tables, Not Installed Y
RTS ON time Time in mSec between RTS ON and Tx start Y
RTS OFF time Time in mSec between Tx end and RTS OFF Y
Idle Timer Time in minutes with no comm activity before modem disconnects Y

Preset Normal <Register list> <Value in each register>, Editable for numeric registers Y
Alternate <Register list> <Value in each register>, Editable for numeric registers Y
Channel 1 <Ke Value>, “EOI”, “Site Alarm”, “Threshold Alarm”, “Not Installed” N
Channel 2 <Ke Value>, “EOI”, “Site Alarm”, “Threshold Alarm”, “Not Installed” N
Outputs
Channel 3 <Ke Value>, “EOI”, “Site Alarm”, “Threshold Alarm”, “Not Installed” N
Channel 4 <Ke Value>, “EOI”, “Site Alarm”, “Threshold Alarm”, “Not Installed” N
I/O Channel 1 “Counter”, “Interval Sync”, “TOU Override”, “Status”, “Not Installed” N
Inputs
Channel 2 “Counter”, “Interval Sync”, “TOU Override”, “Status”, “Not Installed” N
Channel 1 <Assigned measurement>, “Not Installed” N
Analogs Channel 2 <Assigned measurement>, “Not Installed” N
Channel 3 <Assigned measurement>, “Not Installed” N
Test Mode <Register list> <Press SET to enter Test Mode> ** N
Optical “Press SET to send character out port” N
Comm Serial 1 “Press SET to send character out port”, “Not Installed” N
Serial 2 “Press SET to send character out port”, “Not Installed” N
Configure Va, Vb, Vc “Press SET for phasor diagram” N
Ia, Ib, Ic “Press SET for phasor diagram” N
Site Check Va, Ia “Press SET for phasor diagram” N
Vb, Ib “Press SET for phasor diagram” N
Vc, Ic “Press SET for phasor diagram” N
Display Display Test “Press SET for display pixel check” N
**Only KWH and KVAR registers are editable and the value displayed while editing is the calibration adjustment (+/- 5%) not the reading

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To access the Display Menus:

1. Remove the meter globe (this may require breaking a seal). Turn the globe counter-
clockwise to disengage it from the base and set it aside.
2. Press any one of the four arrow buttons on the right front of the meter, and the display will
immediately go to the Menu Mode. If it does not, the Security Key may be removed, thus
restricting access. If your company procedures allow it, you can enable access to the front
panel. Refer to “Chapter 5 – Maintenance” for information about Security Keys.
3. The lower portion of the display is now divided into three menu columns. Starting at the
leftmost column, you will see the “Settings” category highlighted. Highlighted areas indicate
the selected area that is presently active. Using the UP and DOWN arrow buttons, you can
scroll through the first column choices. Note that the second column will adjust to the
function selected in the first column.
4. Use the right arrow button to move the cursor to the second column. The third column
choices are now visible. In this manner, you can scroll up, down, left, or right, to place the
cursor on the specific function you want to view or edit. Familiarize yourself with this
operation before proceeding. Press the READ button any time you want to return to the
normal display.
5. Once you have selected the correct menu feature, the value will be displayed in the upper
section. Press SET to edit the value. Note: Some functions can be edited, some cannot. If it
is changeable, a highlighted cursor will appear in the upper right section.

Typical example of setting the meter’s clock. Note the minute

digit “4” is highlighted for change.

6. To increment the highlighted digit, press the + button; to decrement, press the - button. You
may press the READ button at any time to cancel the operation without making any changes.
7. To select the next digit, press the right arrow button.
8. Continue selecting and incrementing/decrementing digits until the desired setting has been
configured.
9. When the last digit has been changed, press the SET button. The meter accepts the change
and automatically returns to the lower menu section. Use the left arrow to back through the
menus and return to the normal display, or press the READ button to escape.

Note: If the meter is left in the Menu Mode without user interaction (i.e. pressing buttons), it
will automatically revert to normal display operation after 1 minute (factory default setting).
The length of time can be configured for up to 60 minutes by changing the “Preset Mode
timeout” under Display Setup in JEMWare.

Register Display Modes

The meter registers can be grouped in three different display modes: Normal, Alternate, and Test.
JEMStar can display up to 50 Normal and 50 Alternate registers. Normal Mode is the “usual” display
mode of the meter. If display Scrolling is enabled (via JEMWare), the Normal Mode registers are
sequentially displayed at a user-configurable rate.

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TIP: If the meter is configured for a scrolling display, you can halt it by pressing and holding the SET
button for 5 seconds. This will stop the display indefinitely. Pressing the READ button will return the
display to scroll mode.

Alternate Mode registers are a second group of registers that are not displayed in the Normal Mode.
These registers could be used as a convenient method to group storage registers, or any other user
purpose. They are accessible to the meter reader by pressing and holding the READ button for at least
two seconds. To return to Normal registers, press and hold the READ button again for two seconds.

While in Normal or Alternate Mode, if the meter detects a System Error condition (for example, a
Battery Warning), each time a new register is presented an error message will be displayed briefly before
the actual register value. Performing a Billing Period Reset will clear the System Error reports.

Test Mode is used for testing the accuracy of the meter. Refer to Chapter 4, Test & Calibration for a
complete explanation of Test Mode.

Note: When in Test Mode, only the Test Mode registers update. The standard metering registers and
load-profile data do not accumulate. The normal metering functions are suspended until Test Mode is
exited.

To manually scroll through Normal Mode registers:

The display registers defined in the Normal Mode can be manually scrolled by momentarily pressing the
READ button to step to the next register.

To enter Alternate Mode displays:

Alternate Mode is entered by holding down the READ button for two or more seconds. The Alternate
Mode registers can be scrolled through manually by momentarily pressing the READ button. To return
the meter to Normal Mode from Alternate Mode, press and hold the READ button for two or more
seconds and release.

Test Mode
The JEMStar meter has a special mode of operation, called Test Mode, that allows the operator to apply
test voltages and currents to the meter without having them affect Normal or Alternate registers, or Load
Profile. Test Mode also allows adjustment of meter registration.
During Test Mode, the following conditions exist:
1. Normal and Alternate registers stop accumulating. Peak, Coincident, and Time/Date of Peak
registers may continue to update, but they behave as if there is zero power applied to the meter.
2. Load Profile stops accumulating and storing interval records. Any partial interval counts
accumulated before entering Test Mode will be retained, and will be stored with a Test Mode
event record when Test Mode ends.
3. Test Registers accumulate power, and behave as expected for the type of register. (E.g. Time-of-
Use registers respond only during the correct rate period, Demand registers update on normal
demand interval timing, etc.)
4. The Optical Port emits Test Pulses.
5. Analog Outputs continue to operate as before.
6. Energy (KYZ) pulses continue to operate as before.

Refer to “Chapter 4 - Test & Calibration” for a complete explanation of Test Mode operation.

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Note: If the meter has been configured with a “Test Timeout” via JEMWare, the display will
automatically revert to normal operation after the designated length of time without user interaction. The
factory default setting is 30 minutes.

Display Format and Auto-Ranging

Because of the nature of register values, some register types are formatted differently than others. The
user has the capability to configure the number of digits to be displayed and the number of digits to the
right of the decimal point. However, in order to create the most flexibility, non-accumulating registers
are displayed in an Auto Range style, where the value (including decimal point) is shifted to the right to
make sure the most significant digits are displayed, despite the user's configuration.

For example, an Instantaneous Watt register may be configured by the user to show 6 total digits and 3
decimal places. Without auto ranging, this could be a problem if the quantity exceeds 999.999 W because
the most significant digits would not be displayed. However, JEMStar will auto range by moving the
decimal to the right and allowing a greater quantity to be displayed.

Therefore, each register type can be categorized into one of three behaviors:
Auto Ranging User-Configured Format Fixed Format
(potential overflow) (unaffected by user configuration)
Instantaneous Consumption Time of Peak
Average PF Cumulative Peak Demand Date of Peak
Peak Demand Continuous Cumulative Demand
Coincident Demand
Thermal Demand
Peak Thermal Demand
Predicted Demand

The user may choose to display Consumption, Peak Demand, Coincident Demand, Cumulative Demand,
Continuous Cumulative Demand, and Predicted Demand with leading zeroes. In this event, Auto Range
is not applied to any of these register types.

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CHANGING METER CONFIGURATIONS

The meter front panel offers some basic setup features, however you will use JEMWare software to make
most changes in a meter configuration. Please refer to Publication 1083-602 for complete details about
using the program.

Certain features of the JEMStar meter are forced to be re-initialized when portions of the meter’s
configuration are changed. This section summarizes the changes that will force a re-initialization. Note
that when a new configuration is loaded into a meter, the meter determines individually if each section
has changed from the currently stored configuration. These features are re-initialized ONLY if the
particular configuration sections are different. Re-initialization means that the data in that particular
register is set to zero.

Display Registers
The Display Registers feature includes the following parts of the JEMStar:
• Registers in the Normal display list
• Registers in the Alternate display list
• Registers in the Test display list
• Self Read registers
• Register Thresholds
• Site Monitor alarms
• Totalization registers
The following configuration sections, if modified, will cause the Display Registers feature to be re-
initialized, erasing all previous data:
• Normal display list
• Alternate display list
• Test display list
• Demand settings
• Self Read settings
• Primary Scaling settings (including changing VT Ratio or CT Ratio from the meter front
panel.)
• Register Threshold settings
• Demand, Load Profile Interval Timing settings
• Totalization channel setup
Load Profile
The Load Profile features (which does not include individual Event Logs) will be erased and re-
initialized if these configuration sections are modified:
• Demand, Load Profile Interval Timing settings
• Load Profile channel assignments
• Primary Scaling settings (including changing VT Ratio or CT Ratio from the meter front
panel)
• Totalization channels

Energy Pulses
The Energy Pulse feature will be re-initialized if these configuration sections are changed:
• Energy pulse channel assignments

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DISPLAY MENUS
The following section details how to use the meter display menus. The categories are listed in the order
they appear on the screen. Refer to the preceding chart “Display Menu Layout” for a full list of the
available menus.

Some display menu features are read-only and some are directly editable. The meter settings that can be
edited via the front panel are limited to the most common functions. ALL JEMStar settings can be
configured using JEMWare software. Please refer to the JEMWare instruction manual 1083-602 to
configure a meter via software.

JEMStar uses two security keys to limit access to the front panel pushbuttons. Depending upon your
company’s policy, you may need to “unlock” the keypad. Refer to Section 5 – Maintenance for
instructions about Security Keys.

VTR/CTR
You can read and change the Voltage Transformer Ratio and the Current Transformer Ratio
by going to the menu Settings | Identity | VTR (or) CTR. Edit the existing setting by pressing SET and
using the arrow buttons to enter a new ratio. Be sure to update the front panel label to correspond to the
new ratio that you entered.

NOTE 1: Changing the meter’s VT or CT Ratio will cause Load Profile pulse constants, Energy
Pulse constants, Site Monitor thresholds, and Analog Output levels to be re-scaled automatically
so that they will maintain the same settings in Primary units. It will also cause all numeric
registers to be erased and re-initialized.
NOTE 2: Changing the meter’s VT or CT Ratio from the front panel will invalidate any Loss
Compensation settings that may already be configured. If you use the Loss Compensation
feature, enter the VT and CT Ratios via JEMWare configuration software to maintain your TLC
settings.

Service, ID, Revision

You can read the following information about how the meter is configured by going to the menu:
Settings | Identity | Service or Program ID or Firmware Rev.

Type of Service Available types are 4-Wire Wye, 4-Wire Delta, 3-Wire Delta, Network, Open
Delta, 3-Wire Wye
Program ID This is the meter identification that will appear in the register list.
Firmware Rev This is the version number of the firmware installed in the meter.

Demand Intervals
You can read the Demand Interval and Subinterval lengths in hours and minutes by going to menu:
Settings | Demand | Interval or Subinterval. These settings can only be edited by using JEMWare
software.

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Date / Time
JEMStar uses a real-time clock capable of maintaining time and date with a very high resolution. With
the on-board battery, it will maintain time even when auxiliary power is off.

The JEMStar clock can be configured to use the local power line frequency as a time synchronization
method, or to use the internal frequency reference (crystal oscillator). If JEMStar is configured for line
sync, it will continue to keep time even if the Phase A reference voltage disappears. If auxiliary power is
absent, the meter will revert to the internal crystal time base.

The JEMStar clock accuracy, when configured for line sync, is dependent on the line frequency
accuracy. When configured for crystal sync, JEMStar’s timekeeping accuracy is 3 minutes per month or
better.

The date and time can be set from the front panel or via serial communication command. JEMStar will
accommodate the differences in the way time is adjusted for daylight savings time internationally
through the JEMWare program.

Note: Date and Time can only be edited through the Settings menu (not via Presets).

Setting the Date and Time

The date and time can be set either through the front panel, or
through serial communications via JEMWare software. Since
this may affect interval timing or TOU, this session is
logged as a manual Time Set event. The front panel
procedure is performed as follows.

Date Set
1. Remove the meter globe.
2. To enter the Date Set Mode, press any arrow key. Using the arrow keys, go to Settings | Date
Time | Date, then press the SET button. The date appears as XX.XX.XX and is a
configurable sequence through JEMWare. The first digit in the line is highlighted.
(Highlighted digits are selected digits.)
3. To increment the highlighted digit, press the + button; to decrement, press the - button. You
may press the READ button at any time to cancel the operation.
4. To select the next digit, press the right arrow button.
5. Continue selecting and incrementing/decrementing digits until the desired date has been
entered.
6. Press the SET button to accept the new value. The meter automatically returns to the menu.
Use the left arrow to back through the menus and return to the normal display, or press the
READ button to escape.

Time Set
1. Remove the meter globe.
2. To enter the Time Set Mode, press any arrow key. Using the arrow keys, go to Settings |
Date Time | Time, then press the SET button. The time appears as HH.MM.SS in 24-hour
format. The first digit in the line is highlighted. (Highlighted digits are selected digits.)
3. To increment the highlighted digit, press the + button; to decrement, press the - button.
4. To select the next digit, press the right arrow button.
5. Continue selecting and incrementing/decrementing digits until the desired time has been
entered.
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6. Press the SET button to accept the new value. The meter automatically returns to the menu.
Use the left arrow to back through the menus and return to the normal display, or press the
READ button to escape.

Note: Automatic meter actions that are configured to activate on a non-existent date are automatically changed to occur
at the same time on the first day of the following month.
Example: An auto-billing period reset configured to occur at midnight on the 30th day of each month will do so
each month except February. In that instance, the BPR will occur at midnight on March 1st. A “day” is defined
to begin at midnight (00:00:00 am) and end after 11:59:59.

Health Status
The meter has several internal safeguards that verify its’ own operation. You can check the status of
these monitors from the display menus by going to Settings | Health Status, and then choose a feature.

Battery Status Monitors the internal RAM battery and advises if OK.
Configuration Verifies if the meter’s configuration is acceptable. Note that this only checks for
conflicts in the setup; individual settings could still be incorrect for your specific
application.
Site Monitor Indicates if the parameter (assigned as a Site Monitor in JEMWare) is Normal or
in the Alarm state.
Threshold 1/2/3/4 Indicates if a monitored parameter (assigned as a Threshold Alarm in JEMWare)
is Normal or in the Alarm state.

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Interpreting Status Register Values in the JEMStar Display

In addition to the Health Status display previously described, the user can assign Normal or Alternate
registers to report various status functions. This configuration procedure is fully described in the
JEMWare software manual 1083-602.

JEMStar Status Register values are displayed as eight-digit hexadecimal numbers, although only three
digit positions are applicable to status reporting. All other digits will be zero and should be disregarded.
The format of the displayed number is:

----MT-P
The digit in the M position reports Meter status.
The digit in the T position reports the Threshold Alarm status.
The digit in the P position reports the Potential Indicator status.
The digits in the – position are always zero.

Meter Status
Four conditions are reported in the Meter status digit: Battery Warning, Configuration Default, Site
Monitor Warning, and External Status Input.

Battery Warning occurs when the meter has spent more than a cumulative 2 years in a powered-down
state, drawing battery power to maintain memory. This does NOT indicate that the battery is low, simply
that the user should consider replacing it.

Configuration Default occurs when a non-recoverable error is detected in some part of the meter’s
Configuration tables, and the meter has switched that part to a default configuration.

Site Monitor Warning indicates that the meter has detected an alarm condition that the Site Monitor
system was configured to report.

External Status reports the state of the optional contact input, when the input is configured as a Status
indicator. If both contact inputs are configured as Status, then an operation of either one (or both) will
produce the “On” indication.

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The following chart should be used to interpret the hexadecimal code for Meter status, shown as the fifth
digit from the left.

Meter Status Battery Warning Config Default Site Monitor External Status
Digit Value
0
1 On
2 Yes
3 Yes On
4 Yes
5 Yes On
6 Yes Yes
7 Yes Yes On
8 Yes
9 Yes On
A Yes Yes
B Yes Yes On
C Yes Yes
D Yes Yes On
E Yes Yes Yes
F Yes Yes Yes On

Threshold Alarm Status

This digit, displayed sixth from the left, reports the state of the four Register Threshold detectors in the
JEMStar.

Threshold Alarm Threshold 1 Threshold 2 Threshold 3 Threshold 4

Digit Value
0
1 Yes
2 Yes
3 Yes Yes
4 Yes
5 Yes Yes
6 Yes Yes
7 Yes Yes Yes
8 Yes
9 Yes Yes
A Yes Yes
B Yes Yes Yes
C Yes Yes
D Yes Yes Yes
E Yes Yes Yes
F Yes Yes Yes Yes

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Potential Indicator Status

This digit, displayed eighth (or last) from the left, monitors the presence of up to three meter phase
potential inputs.

Potential Indicator Phase C Phase B Phase A

Digit Value
0
1 On
2 On
3 On On
4 On
5 On On
6 On On
7 On On On

Communication Settings
There are three basic methods of interfacing with JEMStar: Optical port, Serial data (RS-232/485), and
modem. The display menu allows reading and editing of basic communications port parameters such as:
Type For Serial 1 and Serial 2, select whether communications are via RS232, RS485,
or Modem
Port address Entered as a hexadecimal number
Port baud rate Use the arrow buttons to scroll through the available choices
Comm protocol Use the arrow buttons to select either Binary, DNP, Modbus (RTU or ASCII), or
ANSI Tables

Go to menu: Settings | Optical or Serial 1 or Serial 2, then choose one of the above parameters to read or
edit.

Preset Meter Registers

Register Preset enables the user to set meter registers at a
predetermined value. This option is often used when meters
are replaced, allowing the user to set the new meter with the
previous meter’s register settings.

Most quantity registers can be preset. This function can be

performed directly from the front panel of the meter, or with
the JEMWare configuration software. Since this may affect the correlation between Register and Load
Profile readings, this session is logged as a Register Preset event.

To preset the meter registers from the front panel:

1. Press any arrow key to enter the menu screen.
2. Using the arrow keys, go to menu selection Preset | Normal or Alt | . The registers
available for presetting appear in the far right column on the meter display.
3. Use the arrows to select a register from the right-hand column to preset, and then press
the SET button. The first blinking digit in the setup field is the selected digit.

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4. To increment the highlighted digit, press the + button; to decrement, press the - button.
You may press the READ button at any time to cancel the operation.
5. To select the next digit, press the right arrow button.
6. Continue selecting and incrementing/decrementing digits until the desired quantity is
shown on the display.
7. When the desired register value is reached, save that register value by pressing the SET
button. The meter automatically returns to the menu.
8. Repeat Steps 3 through 7 to preset any other register quantities.
9. When all the necessary registers are preset, press the left arrow button repeatedly to exit
out of the menu screen, or press READ.

Note: Pressing the READ button while editing a register will cancel the SET operation and restores the
register to its’ original value(s).

To preset the meter registers using JEMWare software:

Please refer to the JEMWare Instruction Manual 1083-602

Outputs
This is a view-only menu from the meter; all edits must be performed using JEMWare software. With
the DI/DO or 5KYZ option for Contact Outputs installed, JEMStar can provide up to five separate output
signals. Using JEMWare software, each output can be configured for one of the following:
• EOI (End Of Interval) pulse
• Constant: The amount of energy represented by each pulse, in either secondary or primary
units (Ke value).
• Alarm: An output can be triggered either by a Site Alarm or Threshold Alarm.
• If the contact opens / closes when the register value exceeds the upper threshold.
Note: By default, the contact reverts to its normal state once the corresponding register value
recedes below the lower threshold.

To view the output settings, go to menu: I/O | Outputs, then select a Channel number that you want to
view. The screen will display what each of the four channels has been configured to monitor.

Contact Input Option

This is a view-only menu from the meter; all edits must be performed using JEMWare software. With
the DI/DO (or 5KYZ) option for Contact Inputs installed, JEMStar can accept up to two separate inputs
from outside sources. Using JEMWare software, each input can be configured for one of the following:
Counter Used to count any pulses
Interval Sync Used to accept EOI output pulses from another meter, thus keeping
demand intervals synchronized
TOU Override An input pulse will cause the meter to revert to any predetermined Time
Of Use rate.
Status An input pulse is recorded as a Status event in Load Profile data
Totalization An input pulse adds a configurable amount of energy to a Totalization
channel's reading.
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To view the input arrangement, go to menu: I/O | Inputs, then select a Channel number that you want to
view. The screen will display how each of the two channels has been configured.

Analogs
Three current-output signals can be supplied as an option for external indication or to interface to other
data systems. The output range is factory supplied as either 0-1mA or 4-20mA. Each analog output is
configurable to one of the basic measured quantities: Watt, VAR (or Q), VA, A, V, PF, Frequency, or
THD.
The analog-output connection is a pigtail cable located at the base of the meter on socket and A-base
meters. The analog-output signals for switchboard-case meters are available through the screw terminal
block at the rear of the case.

To view how the analog outputs are configured, go to display menu: I/O | Analogs, then select a Channel
number that you want to view. The screen will display how each of the analog channels has been
configured. To edit the configuration, you must use JEMWare software.

Configure
The Configure menus are used to put the meter in Test Mode, verify communications, check the meter
installation using phasor diagrams, and perform a display pixel check. These features are described in
the following sections.

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TEST & CALIBRATION

Test Mode
You can test meter functions and accuracy from the front
panel. Since this may temporarily inhibit registration,
this session is logged as a Test Mode event. You must
break a seal to perform this function.

To enter the Test Mode, go to display menu:

Configure | Tstmode, then select a parameter from the
third column that you want to view. You must press the SET button to actually enter Test Mode. This
action helps prevent accidentally entering into Test Mode and suspending registration.

Registration Adjustment
You can adjust the meter’s Watt and VAR registration from the meter’s front panel. This session is
logged as a Calibration event and is performed in Test Mode. This is not a full meter calibration. If re-
calibration is required, the meter must be returned to the factory.

The JEMStar optical port on the face of the meter performs two functions. During Standard Meter
Mode, it is used for serial communications. In Test Mode, the optical port on the face of the meter sends
out test pulses consistent with the test register that is being displayed (e.g. Watthour, Varhour). The
pulse outputs are available even when the meter is in Test Mode, operating at their programmed Ke
value. You may use a Scientific Columbus Model 5282 Optical Port Adapter or equivalent that will
convert the optical pulses to contact closures. This can then be interfaced to a Watt standard’s (such as
Scientific Columbus’ MicroJoule®II) external gate input.

The JEMStar is tested like any other electronic meter. It should be set up so the test standard sees the
same voltage and current as the meter. This is done by connecting the JEMStar voltage elements in
parallel and the current elements in series. Refer to the following example that shows how to connect a
JEMStar and a Watt Standard to an external load source.

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MicroJoule Standard

2.5A 5A 100% Model 5282 Optical

OFF 10%
1A 15A Optical Port
Pulse
METER RANGE
Adapter
COM 50A V/VH(ES) Multifunction
VOLTS CURRENT INPUT Standard
240

120 480
FUNCTION

1.0 0.5 VOLTAGE INPUT

LO MED HI
PULSE OUTPUT

PF STORAGE
COMPARTMENT
MICROJOULE ® II STD A

INSTRUCTIONS STD B
JEMSTAR
CABLES (DISPLAY)
AMPERES RESISTORS STD C

EXT
GATE
TEST 7 8 9
STORE-RECALL
4 5 6 CONTROL
PROGRAM RELAY
1 2 3
SELECT STD.
0
POWER

Load Simulator 9 10 11 12 13 14 15

1 2 3 4 5 6 7 8

65036-003A

TYPICAL CONNECTION DIAGRAM FOR JEMSTAR and MICROJOULE II TO AN

EXTERNAL LOAD SOURCE

The model number, serial number, firmware version, and calibration date are stored in nonvolatile
memory and cannot be changed.

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Test Mode
During Test Mode, the following conditions exist:
1. Normal and Alternate registers stop accumulating. Peak, Coincident, and Time/Date of Peak
registers may continue to update, but they behave as if there is zero power applied to the
meter.
2. Load Profile stops accumulating and storing interval records. Any partial interval counts
accumulated before entering Test Mode will be retained, and will be stored with a Test Mode
event record when Test Mode ends.
3. Test Registers accumulate power, and behave as expected for the type of register. (E.g. Time-
of-Use registers respond only during the correct rate period, Demand registers update on
normal demand interval timing, etc.)
4. The Optical Port emits Test Pulses.
5. Analog Outputs continue to operate as before.
6. Energy output pulses continue to operate as before.

Test Mode ends on any of these conditions:

1. The user manually leaves Test Mode.
2. The meter detects a period of inactivity and exits Test Mode automatically. (Test Mode timeout.)
3. The meter loses power.

When Test Mode ends, the following occurs:

1. Normal and Alternate registers resume normal operation, accumulating power that is applied to
the meter. Demand and TOU scheduling is unaffected.
2. Load Profile records a Test Mode event with partial interval counts from the interval before Test
Mode began, then resumes normal operation.
3. The Optical Test Pulse stops.
4. Loss Compensation is re-enabled if it had been disabled while in Test Mode.

Enter Test Mode

To enter Test Mode, perform the following steps:
1. Press any Arrow key to enter Menu Mode. A set of three list columns and a smaller numeric field
will appear.
2. Press the Down Arrow key 3 times to select Configure.
3. Press the Right Arrow key once to select Tstmode.
4. Press the Right Arrow key once more to enter Test Mode. The display will show “SET TO
ENTER.” Press the Set key to confirm entering Test Mode.

Exit Test Mode

To leave Test Mode:
1. Press the Left Arrow key from any Test register. The display will show “SET TO EXIT”. Press
the Set key to confirm leaving Test Mode. Note: Pressing the Reset key while in Test Mode will
zero out all cumulative Test registers.

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JEMStar User Manual

Navigating in Test Mode

To view a Test Register:
1. Press the Up or Down Arrow keys as needed to select the desired register. The content of the
register will be displayed in the numeric field above the menu lists.

To turn Loss Compensation on or off:

1. Press the Up Arrow key as needed to reach the first register in the Test list, which is the Loss
Comp status. The field above the menu lists will show ENABLED. Note: This is a default Test
setting only, and has no affect over the actual meter configuration. The configuration setting as
sent from JEMWare governs whether TLC is actually enabled or disabled.
2. Press the Set key. The ENABLED / DISABLED will be highlighted. Press the Up or Down
Arrow key to toggle between ENABLED and DISABLED state.
3. When the correct state is displayed, press the Set key to accept the new state.
Note: After leaving Test Mode, Loss Compensation will automatically return to its’ configured
state.

To adjust the Watt / Watthour gain of the meter:

1. Select a Watt or Watthour Test register. (NOTE: Either one will take the user to the combined
Watt / Watthour gain adjustment. The adjustment affects both functions.)
2. Press the Set key.
3. The field above the menu lists will show a number like this: +0.00%
4. The “+” sign will be highlighted. Toggle between “+” and “-“ by pressing the Up or Down
Arrow keys.
5. Select other digits to modify by pressing the Left and Right Arrow keys. Each highlighted digit
may be incremented by pressing the Up Arrow key or decremented by pressing the Down Arrow
key. The user may enter a percentage correction for Watt / Watthour registration between –9.99%
and +9.99%.
6. When the desired amount of correction is displayed, press the SET key to accept it. Press READ
if you want to cancel.
7. The gain correction entered applies to both Watts and Watthours on all phases (delivered and
received), even though the register displayed may have been a single-phase register.
8. Watt / Watthour gain corrections entered in this way will remain in effect after Test Mode ends.
Note: Adjusting Watt/Watthour gain will affect VA, VAhour, Q, Qhour, and PF.

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 Chapter 4 – Test & Calibration

To adjust the VAR gain of the meter:

1. Select a VAR or VARhour Test register. (NOTE: Either one will take the user to the combined
VAR / VARhour gain adjustment. The adjustment affects both functions.)
2. Press the Set key.
3. The field above the menu lists will show a number like this:
+0.00%
4. The “+” sign will be highlighted. Toggle between “+” and “-“ by pressing the Up or Down
Arrow keys.
5. Select other digits to modify by pressing the Left and Right Arrow keys. Each highlighted digit
may be incremented by pressing the Up Arrow key, or decremented by pressing the Down Arrow
key. The user may enter a percentage correction for VAR / VARhour registration between –
9.99% and +9.99%.
6. When the desired amount of correction is displayed, press the SET key to accept it. Press READ
if you want to cancel.
7. The gain correction entered applies to both VARs and VARhours on all phases (delivered and
received), even though the register displayed may have been a single-phase register.
8. VAR / VARhour gain corrections entered in this way will remain in effect after Test Mode ends.

Note: Adjusting VAR/VARhour gain will affect VA, VAhour, Q, Qhour, and PF.

To use the Optical Test Pulse:

The Optical Test Pulse is an energy pulse output, similar to a KYZ pulse, that repeats at a rate
proportional to energy consumption. Each pulse is a brief (approximately 30 to 40 millisecond) burst of
infrared light sent by the Optical Port transmitter.
Measurements that may be selected for output as a Test Pulse are:
• Watthours
• VARhours
• Vahours
• Qhours
• Amphours

Any direction (Delivered, Received, per-quadrant) and element (phase A, B, C, or total) that may be
selected for one of these measurements in a display register may be output as a Test Pulse. The pulse
weight (Kt) for each pulse is fixed.

The Test Pulse output is always assigned to match the currently displayed Test register, if the register is
displaying one of the measurements listed above. In other words:
If the register displays: The Test Pulse output is:
Watts or Watthours, per-phase or total, any Watthours, per-phase or total, any direction,
direction 1.8 Wh / pulse
VAR or VARhours, per-phase or total, any VARhours, per-phase or total, any direction,
direction 1.8 VARh / pulse
VA or VAhours, per-phase or total, any VAhours, per-phase or total, any direction,
direction 1.8 VAh / pulse
Q or Qhours, per-phase or total, any Qhours, per-phase or total, any direction,
direction 1.8 Qh / pulse
Amps or Amphours, per-phase or total Amphours, per-phase or total, 0.02 Ah /
pulse
Any other register type No change from the previous Test Pulse
assignment.
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The Optical Test Pulse may be picked up with any Optical Port receiver, although we recommend the
Scientific Columbus Model 5282 Optical Port Adapter. The 5282 allows the Optical Port to be used for
serial communication with a computer as well as directing the Test Pulse to an external counter for
accuracy testing.

If the Optical Port is being used for serial communication during Test Mode, a Test Pulse may
occasionally interfere with the meter’s response to commands. The meter is capable of receiving and
executing commands during Test Mode – only the response may be garbled. The normal Binary Protocol
error checking and retry mechanism will provide reliable communication in this situation.

JEMStar Test Pulse Output

It is important to wait 15 seconds after application of potential before entering Test Mode. Otherwise,
the meter may not produce test pulses in Test Mode. If the meter is suspected of not producing test
pulses, scroll through Test Mode to the function under test (after 15 seconds of power-on time).

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 MAINTENANCE
Any JEMStar option, except for those noted as "factory configuration" or "configured at manufacture,"
can be installed by a user with the following capabilities:

• Intermediate skill as an electronic technician, including knowledge of static-protection and electrical

safety techniques.
• Familiar with the proper use of common tools (e.g. screwdrivers, wire strippers or cutters, wrenches,
etc.) and equipment (e.g. voltmeter) used in electronics, including static reduction equipment such as
grounding straps or mats. Soldering equipment is NOT required.

The JEMStar meter design, with its plug-together boards, requires few tools for maintenance.

Caution!
All meter work must be performed at static-protected workstations
WITH POWER REMOVED.
The technician must follow properly prescribed static-control practices.
Refer to Appendix C for more information.

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JEMStar User Manual

JEMSTAR SERVICING
JEMStar meters are available in socket-base (S- and A-base), and switchboard mounting packages. The
disassembly procedure for each type is described as follows.

Socket-base meters (S- and A-base)

Globe Removal
1. Remove power from meter!
2. Remove all wire seals from the locking ring of the meter globe, and then remove the ring.
You do NOT need to remove any seals from the RESET button.
3. Turn the globe counter-clockwise approximately 1 inch to disengage it from the base.
4. Carefully slide the globe forward away from the base and set it aside.

Internal Housing Disassembly

1. Remove the top cover of the housing by unscrewing three Phillips-head screws (below).
Carefully lift the cover off, paying particular attention to the RAM battery wires. Do not
unplug the battery, or data will be lost!

Top View of meter

with globe removed

Remove screws at these locations,

then lift the top cover off.

Be careful of the battery wires!

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 Chapter 5 – Maintenance

Register/Metrology board (behind front plate)

I/O board
Serial Communication board
Modem battery pack

Ribbon Cable

Battery for
RAM

LCD
Display

Optical I/O Cable

Port 3 Ft.

Reset
Button
Seal
CT
Power Supply Base

JEMStar S-Base, Exploded view, Internal Case removed

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JEMStar User Manual

Switchboard Meters

Cover Removal
1. Remove power from the meter, if possible. It is not mandatory that power is removed
because the Switchboard meter has its’ own disconnect device. However, caution is advised
since live terminations exist inside the housing even after the paddle is removed.
2. Remove the wire seal on the thumbscrew at the bottom center of the meter cover.
3. Unfasten the thumbscrew and lift the cover slightly while pulling forward from the bottom.

Internal Chassis Removal

1. Locate the black plastic paddle at the bottom of the chassis. Grasp the protruding handle
section and firmly pull it toward you. This will safely disconnect and bypass the CT circuits
from the meter.
2. Locate the upper and lower metal locking latches. At the same time, pull both the upper and
lower tabs towards you until the levers are pointed straight out (about 90° swing).
3. Grasping the levers, gently rock the chassis while pulling forward. When the chassis is loose,
remove it from the housing. You can now take the entire chassis to your service shop.

When re-installing the meter, note that the thumbscrew on the front cover has a small indentation on the
head. This indicates the orientation of the hole in the screw for inserting the sealing wire. Turn the
screw until the dot is in a horizontal position, and the hole in the screw will line up with the hole in the
plastic cover.

Serviceable Parts
The JEMStar’s communication board and I/O board can be changed in the meter shop with a few simple
procedures. Because the register/metrology board is calibrated to the current transformers and power
supply board, Ametek Power Instruments recommends that the meter be returned to the factory if
changes to these components are necessary.

The JEMStar clock/RAM battery is designed to last the life of the meter under normal storage and usage
conditions. If the battery needs replacement, or you would like more information on any JEMStar
components, call Ametek Power Instruments’ Technical Support staff at 888-880-5361.

Serial Communication Board (Option)

To remove the serial comm board:
1. Remove power from the meter.
2. Ensure proper grounding for static protection.
3. Remove the globe from the S-base or A-base meter. Remove the cover from the
switchboard-case meter and pull the chassis out of the rack.
4. Remove the top housing cover as previously described (S-base and A-base only).
5. Disconnect the ribbon cable between the Register/Metrology and Comm board.
6. Pull the Comm board out part way.
7. Disconnect the modem cable from the Comm board (if included).
8. Pull the Comm board completely free of the meter.
9. Place the Comm board on an antistatic mat.

To replace the serial comm-option board:

1. Reverse the procedure above.
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 Chapter 5 – Maintenance

I/O Board
To remove the I/O option board:
1. Remove power from the meter.
2. Ensure proper grounding.
3. Remove the globe from the S-base or A-base meter. Remove the cover from the
switchboard-case meter and pull the chassis out of the rack.
4. Remove the top housing cover as previously described (S-base and A-base only).
5. Remove the ribbon cable.
6. Firmly grasp the sides of the I/O board at the top of the board and remove.
7. Place the board on an antistatic mat.

To replace the I/O option board:

1. Reverse the procedure above.
2. Use the software utility program (included on a diskette with the I/O board) to transfer the
proper analog output calibration data into the meter.

Clock/RAM Battery
JEMStar contains an easily replaceable battery that is used to power the internal clock and RAM
memory. The long life cell should provide support for 10 years, and its life can be checked from the
front panel display. There is also a display register (Days on Battery) that can be read to determine how
many days the battery has been used. If the meter is in service, the battery should be replaced while the
meter is under power so that data is not lost (the battery is not used as long as service power is
connected).

To replace the clock/RAM battery:

1. Remove the outer globe from the S-base or A-base model. Remove the front cover from the
switchboard model.
2. The battery is the 1” high cylinder located at the top, right side of the meter. Unplug the two-
pin connector and lift the battery out of its holder.
3. Install a new, exact replacement battery, available from the factory. Specify part number
6005-254.
4. From the front panel menu, select Settings | Health | Batt Status, and then press the Set button
until RESET is displayed. Press the Set button once more and verify the display changes to
BATTERY OK. The Date and Time may also need to be set if the meter was taken out of
service while changing the battery.

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Phone Home on Power Outage Battery Pack (Option)

JEMStar incorporates a replaceable battery pack that is used to power the internal Phone Home modem
during power outages. The battery will provide power to the modem for at least 8 hours of call time. It
is recommended that the battery be changed every three years, or sooner if you experience numerous
power outages.

To replace the Power Outage battery pack:

1. Remove power from the meter.
2. Ensure proper grounding.
3. Remove the outer globe from the S-base or A-base model. Remove the front cover from the
switchboard model.
4. On an S-based or A-base meter, remove the top cover. The battery pack is the four-cell
assembly located in a holder directly under the cover. Unplug the two-pin connector and lift
the battery up and out of its holder.
5. On the switchboard model, pull the chassis out of the rack by opening the upper and lower
retaining latches. The battery pack is located under a retainer bracket near the back of the
meter. Unplug the two-pin connector, loosen the bracket screws, and slide the battery out of
its holder.
6. Install a new, exact replacement battery, available from the factory. Specify part number
15847-001.

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 Chapter 5 – Maintenance

Security Keys
JEMStar includes two security keys to protect the meter from tampering and unwanted access to certain
meter functions. There are two removable jumpers (keys) located inside the meter on the Metrology
board. One security key is used to disable all configuration changes from the front panel keypad menus,
plus the following serial port commands when accessing the meter via JEMWare. Numbers in
parentheses are the hex equivalent of the specific command in JEM binary (see Command Protocol
manual 1083-603).

Enter Test Mode (4D 01)

Preset Normal Registers (57 01)
Preset Alternate Registers (57 02)
Configure Timekeeping (43 07)
Configure Interval Timing (43 08) (demand and Load Profile intervals)
Configure Demand Parameters (43 09) (subinterval length, outage deferral)
Configure Load Profile (43 0A)
Configure Pulse I/O (43 0B)
Configure Analog Outputs (43 0C)
Configure Primary Scaling (43 0D)
Configure Normal display List (43 0E)
Configure Alternate Display List (43 0F)
Configure Test Display List (43 10)
Configure TOU Schedules (43 12)
Configure TOU Seasons (43 13)
Configure TOU Holidays (43 14)
Configure Loss Compensation (43 15)
Configure Reactive Selection (43 16)
Configure Thermal Time Characteristic (43 18)
Configure Threshold Alarms (43 19)
Configure Site Monitor (43 1A)
Configure DST Schedule (43 1C)
Configure Energy Pulses (43 1D)
Calibrating/Loading Flash Memory

The other key is used to disable just the meter’s front panel RESET pushbutton. The RESET button is
used to perform a Billing Period Reset (see the Glossary for definition). With the jumpers installed,
access is enabled. Remove the jumpers to restrict access.

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The meter is provided with both keys factory installed. If you want to remove the key(s) after proper
configuration in your meter shop, follow this procedure.

1. Remove power from the meter.

2. Remove the outer globe of the meter.
3. Remove the top cover of the housing by unscrewing three Phillips-head screws (below).
Carefully lift the cover off, paying particular attention to the RAM battery wires. Do not unplug
the battery, or data will be lost!

Top View of meter

with globe removed

Remove screws at these locations,

then lift the top cover off.

Be careful of the battery wires!

Jumper location beneath the cover

Looking from rear of the meter,

with top cover removed

Remove this jumper to disable all

configuration access from the meter
keypad.

Remove this jumper to disable the

meter’s RESET pushbutton.

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 Chapter 5 – Maintenance

The jumpers are a standard 0.1” center, two-pin female shorting connector commonly used on most PC
motherboards. Contact AMETEK and specify part number 4195-263, or ask your local computer shop
for replacements.

Tip: You can “park” the jumper in a disconnected position by just plugging it onto one contact. This will
keep the jumper in the meter for future use.

Firmware Upgrades
New meter firmware can be downloaded remotely via the meter’s serial port or modem (if equipped).
This may be used to add optional features, product enhancements, or program upgrades. Contact the
factory for more information and assistance.

Health Diagnostics
The JEMStar health-status register provides an indication of the operating ability of the meter. This is
one of the status registers that can be displayed in either of the registering display modes (Normal or
Alternate). An “E” on the JEMStar’s display indicates that a health condition is present and that the
health-status register should be viewed.

Health Status Error

JEMStar Front Panel Display

The JEMStar meter should never have a health-status error; however, in the unlikely event, contact
AMETEK for assistance in interpreting the situation.

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JEMStar User Manual

SITE DIAGNOSTICS
JEMStar can be configured to monitor its operating environment and report suspicious conditions. This
monitoring occurs in two forms: Installation Verification and Installation Monitoring.

Installation (Site) Verification

JEMStar has an operating mode called Installation Verification, during which the meter makes and
displays continuous readings of per-phase voltage, current, and their phase angles with respect to Volts
Phase A. The user can enter this mode and read the information either from the front panel, or remotely
via JEMWare software.

Diagnostic Display using JEMWare

Verification codes are used to interpret the information in light of the meter and service type. If the
actual readings are inconsistent with the expected readings, the information will suggest possible
remedies to be performed.

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Installation (Site) Monitoring

JEMStar will check its present operating conditions on a regular basis and detect the following
conditions:

• Per-phase instantaneous volts outside of configured thresholds (upper and lower)

• Per-phase instantaneous amps outside of configured thresholds (upper and lower)
• Per-phase power factor outside of configured range (upper and lower)
• Reverse power flow on any phase
• Phase voltage sequence out of order
• Internal meter error

Each test can be disabled or enabled during meter configuration. Any detected anomaly can be
configured to report any combination of the following:

• Log to an event buffer, with the date and time when the condition was detected. If later on
the condition is detected to have cleared, another event shall be logged noting the date and
time.
• Set an indication in the Health Status summary register. This indication is removed when the
detected condition has gone away.
• Latch an indication in the Health Status summary register. This indication will remain even
when the detected condition has gone away.
• Activate an annunciator on the front panel. This indication is removed when the detected
condition has gone away.
• Latch an annunciator on the front panel. This indication will remain even when the detected
condition has gone away.
• Override the normal display with a status report that must be manually acknowledged before
normal display operation can continue. This report always latches.
• Close a contact output on the JEMStar. The contact output will remain closed until the
detected condition has gone away.

Notes:
Anomalies are reported only when first detected; persistent conditions are not re-reported unless they
have cleared first.

A Billing Period Reset clears any latched anomaly reports that are no longer valid.

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 ADVANCED FEATURES
TIME OF USE
JEMStar maintains Time of Use (TOU) information for Consumption, Average PF, Peak Demand, Time
of Peak Demand, Coincident Demand, and Coincident PF registers.

The meter can differentiate among up to 9 possible TOU rates, with registers for each rate, as configured
by the user. JEMStar can have up to 8 rate changes per day. Each rate change is configured for the time
of the change (resolved to 1 minute) and the rate code (A – H, or Total). Midnight is always assumed to
be a rate change. The user must define the rate to begin at midnight of each day (midnight counts toward
the limit of 8 changes per day).

JEMStar will recognize up to 9 day types per season: each day of the week (Sunday through Saturday)
plus two Holiday types (Type 1 and Type 2). A rate change schedule must be defined for each day type.

A given day is recognized as a particular day of the week based on the JEMStar internal clock and
calendar, unless that date is listed in the Holiday List. Any date in the Holiday List must be identified as
a Type 1 or Type 2 Holiday. JEMStar can store up to 200 holidays in the Holiday List.

JEMStar is configurable for up to 4 season changes per year. The date (month, day, and year) of each
season start, along with an indication of the season (Season 1, Season 2, Season 3, or Season 4) that starts
on that date, is stored in the Season List. The Season List will hold up to 80 Season Start dates (4 per
year for 20 years).

JEMStar can be configured to force the present TOU rate in effect to any other programmed rate by
triggering a contact closure input. The user must select a rate (1-8, or Total) to switch to when a closure
is detected on the input. The rate then reverts to the normal scheduled rate when the contact opens.

To configure a meter for Time of Use functions, consult the JEMWare instruction manual 1083-602.

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LOAD PROFILE
JEMStar can record up to 4 Load Profile channels as a standard feature, or up to 12 channels as an added
option. All Load Profile configurations are performed using JEMWare software. Load Profile storage is
such that if the available memory becomes full, the oldest record(s) are deleted from memory to make
room for the most recent. JEMStar stores one single record at the end of each Load Profile interval. A
Load Profile interval may end on any of the following conditions:
• On the hour (if configured for "internal Load Profile synchronization") and each multiple of
the configured Load Profile interval length after the hour. Load Profile intervals may be
configured to be 1, 5, 10, 15, 20, 30, or 60 minutes in length.
• On any time set, Daylight Saving Time adjustment, recognizable power outage, or other
event that would cause a discontinuity in interval timing.
• On any event that may cause a discontinuity in registration so that register readings and
equivalent Load Profile readings could not be reconciled. (E.g. Register Freeze, Billing
Period Reset, Register Preset, etc.)

The Load Profile intervals resemble demand intervals, but can be set independently. The interval
closures occur on even increments within the hour. For example, a 15-minute interval will begin on the
hour and will close at 00:15; the next interval will close at 00:30; the next interval will close at 00:45;
etc. At the end of each interval, the meter records the number of pulses accumulated since the last Load
Profile interval closure or special event. When the Load Profile data storage memory is full, the meter
will overwrite the oldest information. The number of days of storage available is determined by the
Load Profile interval length and number of channels stored.

Each Load Profile interval contains one or more channels of data. Each channel is configurable as to the
quantity to be recorded, and the equivalent pulse constant (Km). Each channel can store up to 16,000
equivalent counts per interval.

JEMStar will store at least 60 days of data for 4 channels (up to 12 channels available) recorded every 5
minutes, along with all included Midnight records and reasonable numbers of Time Set, Billing Period
Reset, and Power Outage intervals. By configuring fewer channels and/or longer intervals, you can
increase the number of days of storage.

Each Load Profile channel can be configured to record one of the following:
• Any consumption quantity
• The number of pulses received in an interval on a contact closure input. Both make and
break transitions are counted in the total.
• State of a contact input over the interval. If the contact was closed one or more times during
the interval, the channel will record 1 count, otherwise zero.
• The average of any Instantaneous quantities over a Load Profile interval. In this case, the
channel pulse count multiplied by the equivalent pulse constant shall give the average value,
NOT the consumption in unit-hours, for the Load Profile interval.
• Accumulation in a Totalization channel.

For example, for a 3-element meter operating at 120 volts, 5 amps, 1.0 PF on every
element, an equivalent pulse constant of 1.0 on all channels, and 15 minute Load Profile
intervals, the Watthour Delivered channel will report 450 counts (120V x 5A x 3

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elements / 4 intervals per hour). The Average Instantaneous Watt Delivered channel will
report 1800.

Table 1: Approximate Number of Days of Load Profile Storage (12-Channel Option)

Interval Number of Load Profile Channels Used
Length
(minute 1 2 3 4 5 6 7 8 9 10 11 12
s)
1 49 24 16 12 9 8 7 6 5 4 4 4
2 98 49 32 24 19 16 14 12 10 9 8 8
3 147 73 49 36 29 24 21 18 16 14 13 12
4 196 98 65 49 39 32 28 24 21 19 17 16
5 245 122 81 61 49 40 35 30 27 24 22 20
6 294 147 98 73 58 49 42 36 32 29 26 24
10 490 245 163 122 98 81 70 61 54 49 44 40
12 588 294 196 147 117 98 84 73 65 58 53 49
15 736 368 245 184 147 122 105 92 81 73 66 61
20 981 490 327 245 196 163 140 122 109 98 89 81
147
30 736 490 368 294 245 210 184 163 147 133 122
2
294 147
60 981 736 588 490 420 368 327 294 267 245
4 2

Table 2: Approximate Number of Days of Load Profile Storage (4-Channel Standard)

Interval Number of Load Profile
Length Channels Used
(minute
1 2 3 4
s)
1 17 8 5 4
2 34 17 11 8
3 51 25 17 12
4 68 34 22 17
5 85 42 28 21
6 102 51 34 25
10 170 85 56 42
12 204 102 68 51
15 256 128 85 64
20 341 170 113 85
30 512 256 170 128
102
60 512 341 256
4

JEMStar will record certain events in the Load Profile system intermixed with regular interval data. Any
event that would end a Load Profile interval will be recorded, including the following:

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JEMStar User Manual

Power Fail
Indicates that the meter has lost auxiliary power. If the meter does not have separate auxiliary power,
Power Fail indicates the loss of Phase A power. The time of power failure and time of restoration are
recorded.

Time Set
The beginning and end of a time set are recorded in load-profile memory. Time set can be performed at
the meter or by use of serial communications.

Daylight-Saving Time
Adjustment events are stored. Changes are programmed via the JEMWare program. The DST change
start and stop times are recorded.

Test Mode
Entries and exits are recorded as events. No load-profile data is recorded during the Test Mode. Test
Mode can be initiated at the meter or through serial communications.

Configuration Event
A configuration event is stored in the load-profile memory. Load-profile data is erased when any load-
profile-related parameter is configured. The configuration event is executed only through serial
communications.

Freeze Event
A freeze event will cause the meter to take a snapshot of the Normal- and Alternate-Mode registers.
When the meter reads these registers via serial communications, the value stored at the time of the most
recent freeze event is returned. This event is executed only via serial commands.

Demand Reset
Indicates the time of storage-register updates and register clearing. This command can be initiated from
the meter or through serial communications.

Register Preset
Indicates the time of storage-register presetting when used. This command can be initiated from the
meter or through serial communications.

Midnight
Indicates when midnight occurs in the Load Profile sequence of events.

All recorded events include the following information:

• The date and time at which the event occurred
• A description of the type of event
• The counts for each configured channel from the beginning of the interval until the event
occurred
• If applicable, the time at which the event ended (such as for a Time Set or power outage).

Load-Profile Retrieval
Load Profile may be retrieved in any of the following segments:
• All complete Load Profile records in memory, oldest first.

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• All complete Load Profile records since the last Load Profile read, oldest first.
• All Load Profile records for the last N days, for N = 0 through 60. For any number of days
requested, the meter will send that number of complete day’s records plus whatever records have
been stored in the current day.

For example, requesting 0 days gives only today's records since midnight.
Requesting 2 days gives all records for the preceding 2 days plus the present day's
records. If the Load Profile memory does not contain enough days of records to fulfill
the request, the meter will send all records presently stored.

Data can be retrieved with Ametek Power Instruments’ JemRead software or by Itron’s MV-90 software.
Connection to the meter can be via the optical port, RS-232 / RS-485 serial port, or a modem.

The command protocol specifications that defines the data transfer method is public domain and can be
obtained from the factory; ask for Publication 1083-603. Ametek Power Instruments recommends that
only experienced programmers fluent in communication interfaces undertake such a task.

External-Synchronized Load-Profile Interval Closures

External interval tracking in the meter affects the load-profile channels. For that reason, load-profile
interval length should match demand-interval length.

When configured for external synchronization, the meter uses two time sources—one for determining
interval closure and one for the meter's real-time clock. Data skewing is possible if a synchronization
pulse occurs on the load-profile interval boundary.

External Control of Load Profile Recording

JEMStar can be optionally configured to only record Load Profile data during externally triggered
periods. This can be user-selected on a per channel basis, which means that some channels can record
constantly, and some can record upon command from an external source. JEMWare can be used to
configure any Load Profile channel to record when the TOU Rate Override contact input is ON.

To configure this operation in JEMWare:

1. Go to the Load Profile menu and either Add a new LP channel, or highlight an existing one to
Edit.
2. In the setup screen, choose “Records During TOU Override Only”. Choose OK.
3. Go to the Contact Input/Output menu and set one of the two Input channels for “TOU Rate
Override”.
4. Apply a signal to the Contact Input to begin LP recording on the designated channel.

Notes:
• The TOU Rate Override input does not affect interval timing in any way. It will only
gate the collection of measurements in configured Load Profile channels.
• Load Profile channels configured to record only during TOU Rate Override are not
associated with a given TOU rate. For example: If the meter is configured to use Rate C
as the TOU Override rate, and Rate C also appears in the normal TOU schedule, the
selected Load Profile channels record only while the TOU Rate Override input is on.
• Average Instantaneous Load Profile channels that are configured for TOU Rate Override
are averaged over the period that the TOU Rate Override input is on. For example, with a
constant 1000 watts applied to the meter and an Average Instantaneous Watt load profile
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JEMStar User Manual

channel, if the TOU Rate Override input is active for one half of an interval the final
value recorded in that interval will be 1000 watts, not 500 watts. If the TOU Rate
Override input stays off for the entire interval, the channel will record 0. (An exception to
this is Average Power Factor, which resets to 1.0 at the beginning of an interval and will
remain there unless some actual measurements are collected.)

Typical Load Profile Printout

=================================================
Load Profile Data Display
=================================================

No. Event Type Date Time -1- -2- -3- -4-

851 Data 11-20-00 13:15:00 0 0 0 0
852 Data 11-20-00 13:20:00 0 0 0 0
853 Data 11-20-00 13:25:00 20 0 25 0
854 Test Mode 11-20-00 13:25:36 5 0 5 0
855 Test Mode End 11-20-00 13:26:13
856 Time Set 11-20-00 13:28:55 19 0 24 0
857 Time Set End 11-20-00 23:54:52
858 Data 11-20-00 23:55:00 1 0 1 0
859 Midnight 11-21-00 00:00:00 37 0 47 0
860 Data 11-21-00 00:05:00 42 0 52 0
861 Test Mode 11-21-00 00:08:02 26 0 32 0
862 Test Mode End 11-21-00 00:10:53
863 Data 11-21-00 00:15:00 29 0 37 0
864 Power Failure 11-21-00 00:15:52 6 0 7 0
865 Power Failure End 11-21-00 00:17:14
866 Data 11-21-00 00:20:00 19 0 24 0
867 Data 11-21-00 00:25:00 35 0 44 0
868 Data 11-21-00 00:30:00 35 0 44 0
869 Data 11-21-00 00:35:00 36 0 44 0
870 Data 11-21-00 00:40:00 35 0 43 0
871 Billing Reset 11-21-00 00:40:51 6 0 8 0
872 Data 11-21-00 00:45:00 29 0 36 0
873 LP Download 11-21-00 00:45:08

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 Chapter 6 – Advanced Features

DEMAND PREDICTION
JEMStar can be purchased with an optional feature that will display a Demand Prediction for any
measured Peak Demand quantity. This includes Watts delivered or received; VARs delivered, received,
or per-quadrant; VA delivered or received; Q delivered or received; Amps; or Amps Squared.
A Demand Prediction is the Demand value that is expected at the end of the present demand interval. For
example, if a level 1000 Watts is applied to the meter for a demand interval, the “predicted” demand at
any time during that interval is 1000 Watts (See Example 1). At the end of the demand interval, the
“actual” demand (which is based on actual measurements, not expected measurements) is 1000 watts.
JEMStar updates its internal Demand Prediction approximately every 50 milliseconds. Displayed
Demand Predictions respond more slowly due to system and display timing constraints. Each update is
based on the average of actual instantaneous readings taken in the current demand interval multiplied by
the demand interval time that has already passed, plus the most recent instantaneous reading multiplied
by the time remaining in the demand interval.
The result of this process is that a Demand Prediction register displays what will be the Demand at the
end of the interval if the load remains constant at its present value until then. If the load does vary, the
Demand Prediction register will reflect the new prediction and update the display within a second.
Demand Predictions may be used to monitor a load in order to prevent setting a new Peak Demand. If a
Demand Prediction register shows a value that is higher than the existing Peak Demand, then a new Peak
will occur at the end of the demand interval unless the load is reduced.
In the case of a sliding window (also known as rolling) demand, predictions are made in the last
subinterval of the demand interval. In other words, JEMStar will not try to predict the demand beyond
the present subinterval.

Demand Prediction Algorithm:

The calculation is performed at a rate of once every three power line cycles (about 50 ms):

(Avg × Sec) + (Pres × Rem)

PredDmd =
Int

Where:
PredDmd = Demand Prediction
Avg = Average of Instantaneous Readings already taken in the present demand interval. The average is
updated just before the Prediction is made.
Sec = Seconds that have already elapsed in the demand interval
Pres = Most recent Instantaneous Reading
Rem = Seconds remaining in Demand Interval
Int = Total number of seconds in Demand Interval

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Examples:
(Graphs are not to scale. Assume one Instantaneous measurement per minute for illustration purposes.)

Example 1: Predicted demand with level load

At 16 minutes into the demand interval, every measurement was 1000 watts, which means the average
power was also 1000 watts. One thousand watts times 16 minutes = 16,000 watt-minutes.
The most recent Instantaneous measurement (taken at 16 minutes into the interval) is 1000 watts.
Assume the average power of the remaining 14 (of 30) measurements is 1000 watts. (I.e. a level load.)
One thousand watts times 14 minutes = 14,000 watt minutes. Added to the 16,000 watt-minutes from
before, the total is 30,000 watt-minutes. Divided by 30 total minutes, the Predicted Demand is 1000
watts.

Example 2: Predicted demand with varying load

At 16 minutes into the demand interval the average of 16 Instantaneous measurements was 493.75 watts.
That average times 16 minutes equals 7900 watt-minutes.
The most recent Instantaneous measurement (taken at 16 minutes into the interval) is 100 watts. Assume
the average power of the remaining 14 (of 30) measurements is 100 watts. (I.e. a level load.) One
hundred watts times 14 minutes = 1400 watt minutes. Added to the 7900 watt-minutes from before, the
total is 9300 watt-minutes. Divided by 30 total minutes, the Predicted Demand is 310 watts.

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Example 3: Predicted demand with varying load – further update

Continuing in the same demand interval from Example 2: At 25 minutes into the demand interval the
average of 25 Instantaneous measurements was 576 watts. That average times 25 minutes equals 14,400
watt-minutes.
The most recent Instantaneous measurement (taken at 25 minutes into the interval) is 700 watts. Assume
the average power of the remaining 5 (of 30) measurements is 100 watts. (I.e. a level load.) Seven
hundred watts times 5 minutes = 3500 watt minutes. Added to the 14,400 watt-minutes from before, the
total is 17,900 watt-minutes. Divided by 30 total minutes, the Predicted Demand is 596.67 watts.

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VOLTAGE AND CURRENT TRANSFORMER GAIN CORRECTION

The JEMStar meter may be adjusted to compensate for gain errors in external voltage and current
circuitry; for example, ratio errors in external voltage or current transformers. This correction may be
done without tampering with the actual meter calibration as established at the factory, or any local meter
calibration adjustments made in Test Mode.

Transformer gain correction is set in JEMWare from the Primary Configuration screen. The user may
enter a gain correction from -10.00% to +10.00% in 0.01% increments for each voltage and current
input. These corrections are applied directly to measured voltages and currents before any further
computation is performed; therefore they affect virtually all quantities in the meter.

Like the Test Mode calibration adjustments, the transformer gain correction is lost if a Cold Start or
Firmware Upgrade is performed. Unlike the Test Mode calibration adjustment, the transformer gain
correction is stored as part of a JEMWare configuration file. Therefore, it is important to check the gain
correction figures whenever a configuration file is shared among several meters.

Changing the gain of a voltage or current input will cause any single-phase measurement using that input
to increase or decrease by the amount of the change. For example, changing the Phase A Volts by
+1.00% will cause all Phase A measurements to read 1% high (except for amp quantities).
Polyphase measurements will change by the average of the changes made to each individual phase. For
example, if Phase A Volts is changed by +1.00%, Phase B Volts by +2.00% and Phase C Volts by
+4.00%, the change to polyphase watts is (1+2+4)/3=2.333%

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VOLTAGE SAG / SWELL DETECTION AND LOG

The JEMStar meter may be purchased with an optional Voltage Sag and Swell detection and logging
system. The Sag / Swell detector compares the RMS voltage of each cycle on each meter voltage input
against user-configured upper and lower limits. Whenever a voltage crosses one of these limits an event
is detected. If the event lasts longer than the user-specified minimum duration, it is recorded in the Sag /
Swell Event Log.

The user must configure the following settings for the Sag / Swell Detector:

• Lower voltage (sag) limit for each phase voltage (A, B, and C)*. Voltages below this limit are
detected as a sag event.
• Upper voltage (swell) limit for each phase voltage (A, B, and C) *. Voltages above this limit are
detected as a swell event.
• Minimum duration of event (in cycles) to log. Events shorter than this duration are not logged. A
single duration limit is applied to all phases for both sag and swell events.
• Enhanced resolution mode. This mode allows the ability to measure swell voltages and currents
significantly higher than those normally encountered in the circuit at the expense of accurate power
measurement at light loads.
*
On 2- and 2 ½ element meters the B phase voltage is ignored.

In normal operation, the JEMStar adjusts its voltage and current input gain circuits to maximize power
and energy measurement accuracy. A sudden increase in voltage (a swell) or current (such as that
associated with a fault that causes a voltage sag) may temporarily overload the meter's inputs, causing
clipped voltage and current readings and inaccurate measurements. The enhanced resolution mode causes
the meter to run at lower gain, allowing accurate capture of voltage swells (up to 100% above nominal
volts) and current (up to the rated input of the meter) at the expense of seriously reduced power and
energy accuracy, especially at light loads.

NOTE: Do not use enhanced resolution mode unless you are willing to accept poor accuracy in your
power and energy measurements. In enhanced resolution mode, all power measurements are made at
accuracies listed here:

Class 20 PF=1 PF=0.5 lagging

Input Current Accuracy Accuracy
Watthours 3.0 to 20 A 0.10 % RD 0.15 % RD
(per phase, polyphase total): 2.0 to 3.0 A 0.15 % RD 0.15 % RD
1.0 to 2.0 A 0.25 % RD 0.25 % RD
0.5 to 1.0 A 0.40 % RD 0.50 % RD

Class 20 PF=0 PF=0.5 lagging

Input Current Accuracy Accuracy
VARhours
2.0 to 20 A 0.25 % RD 0.25 % RD
(per phase, polyphase total):
1.0 to 2.0 A 0.35 % RD 0.35 % RD
0.5 to 1.0 A 0.50 % RD 0.50 % RD

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Class 20 PF=1 PF=0.5 lagging

Input Current Accuracy Accuracy
VAhours, Qhours
2.0 to 20 A 0.25 % RD 0.25 % RD
(per phase, polyphase total):
1.0 to 2.0 A 0.35 % RD 0.35 % RD
0.5 to 1.0 A 0.50 % RD 0.50 % RD

Class 20 PF=1 PF=0.5 lagging

Input Current Accuracy Accuracy
Instantaneous Watts
2.0 to 20 A 0.15 % RD 0.15 % RD
(per phase, polyphase total):
1.0 to 2.0 A 0.30 % RD 0.30 % RD
0.5 to 1.0 A 0.50 % RD 0.50 % RD

Class 20 PF=0 PF=0.5 lagging

Input Current Accuracy Accuracy
Instantaneous VARs
(per phase, polyphase total): 2.0 to 20 A 0.25 % RD 0.25 % RD
1.0 to 2.0 A 0.40 % RD 0.40 % RD
0.5 to 1.0 A 0.50 % RD 0.50 % RD

Class 20 PF=1 PF=0.5 lagging

Input Current Accuracy Accuracy
Instantaneous VA, Q
(per phase, polyphase total): 2.0 to 20 A 0.25 % RD 0.25 % RD
1.0 to 2.0 A 0.40 % RD 0.40 % RD
0.5 to 1.0 A 0.50 % RD 0.50 % RD

Instantaneous Volts Class 20

(per phase, polyphase total): 0.15 % RD

Instantaneous Amps Class 20

(per phase, polyphase total, neutral): 0.05 % RD + 0.040 % Iclass

Class 20 Accuracy
Amphours Input Current
(per phase, polyphase total) 2 A to 20 A 0.3 % RD
0.5 A to 2 A 0.6 % RD

Instantaneous Volts2 Class 20

(per phase): 0.2 % RD

Instantaneous Amps2 Class 20

(per phase, polyphase total): 0.2 % RD + 0.005 % Iclass2

Volt2 hours Class 20

(per phase): 0.2 % RD

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 Chapter 6 – Advanced Features

Class 20 Accuracy
2 Input Current
Amps hours
(per phase, polyphase total): 2 A to 20 A 0.3 % RD
1 A to 2 A 1.0 % RD
0.5 A to 1 A 3.0 % RD

Instantaneous Power Factor (per

0.004 * FS / VAphase
phase):

Form 5 Form 6, 8/9

Instantaneous Power Factor (system):
0.004 * 2FS / VAsystem 0.004 * 3FS / VAsystem

Volts THD: 1.0 % absolute

Amps THD: 1.0 % absolute

Frequency (phase A volts): 0.03 % RD

The single-cycle RMS voltages and currents measured by the Sag / Swell detection system operate at an
accuracy of 1% of reading regardless of the setting of the enhanced resolution mode.

The Sag / Swell Event Log records measurements of interest to engineers researching power quality
issues. Each event records the following information:

For each of 3 phases:

• Maximum voltage
• Minimum voltage
• Average voltage
• Maximum current
• Minimum current
• Average current
• Average PF

For the entire event:

• Time at which it occurred or began (resolved to 1 second)
• Duration of the event in cycles
• Status (event type and phase) of the event

The Sag / Swell event system can detect and log voltage sags or swells on each phase that are up to 600
cycles in length as a single event. Sags or swells that exceed that length are logged as two events: the
first records the time at which the sag or swell began and the voltages and currents associated with its
first 600 cycles. The second logged event records the time at which the sag or swell ended and an
indication that it is the end of a long event. The possible Status codes are therefore:

Events up to 600 cycles in length:

• Volts A sag
• Volts B sag
• Volts C sag
• Volts A swell
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• Volts B swell
• Volts C swell

Events longer than 600 cycles:

• Volts A long sag
• Volts B long sag
• Volts C long sag
• Volts A long swell
• Volts B long swell
• Volts C long swell

End of long events:

• Volts A long sag end
• Volts B long sag end
• Volts C long sag end
• Volts A long swell end
• Volts B long swell end
• Volts C long swell end

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 Chapter 6 – Advanced Features

TOTALIZATION
The JEMStar meter may be purchased with an optional Totalization system. Totalization is ability to sum
the energy readings from several different instruments and display the result. JEMStar has 12
totalization channels. Each channel may be displayed as a register in the Normal, Alternate, or Test lists
and / or recorded as a Load Profile channel.

Each Totalization channel behaves as a Consumption register with several added features. Details on
how to configure Totalization channels are contained in the JEMWare User Manual, (document 1083-
602). For each channel the user must configure the following:

• Measurement quantity: choice of Watthours, VARhours, VAhours, Qhours, Amphours, Volt Squared
hours, Amp Squared hours* or Zero (which accumulates only external energy)
• Phase: A, B, C, or Polyphase*
• Direction: Delivered, Received, or a single quadrant for VARhours*
• Time of Use Rate: A through H or Total*
• Compensated or Uncompensated*
• Test Mode
• Enabled
• Load Profile Km in Primary (i.e. at VT and CT input) units
• Up to 2 external energy inputs (contact inputs)
• Pulse Weight in Primary units for each external energy input. Negative pulse weights will be
deducted from the Totalization channel's reading, but it will never fall below zero.
*
These settings are identical to those of a Consumption register.

Most of these settings are self-explanatory, but a few require further description.

The Test Mode setting causes the Totalization channel to operate only while the meter is in Test Mode. If
a Totalization register is to be displayed in the meter's Test list, it must have the Test Mode selection
enabled.

Enabled means the Totalization channel is active.

Load Profile Km is the pulse weight of counts recorded in Load Profile if a Profile channel is selected to
record this Totalization channel's contents. This bypasses the normal Load Profile pulse constant
configuration for that channel.

External energy inputs are pulse inputs on the JEMStar configured to be Totalization inputs. Any
transition (make or break) on one of these inputs can be detected by any Totalization channel and cause
that channel to add the associated Pulse Weight to the Totalization's contents. Note that input Pulse
Weights are configured independently for each Totalization channel. For example, Totalization Channel
1 may count each transition on input one as 1.0 MWh, while Totalization Channel 2 may count each
transition on input one as -3.8 MWh.

A Totalization channel may be displayed, recorded as a Load Profile channel, or both. To display a
Totalization channel, add a register to the desired Display List (Normal, Alternate, or Test) in JEMWare
with a Category of "Totalization" and select the desired Totalization channel number in the Type field.
You may then set up the number of digits and decimal places, storage type, and label as for any other
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numeric register.

To record a Totalization channel in Load Profile, add a Profile channel in JEMWare. In the Quantity
field select the desired Totalization channel number. The Km, Direction, and Phase settings will be
bypassed, but you may still select whether to record always or only during TOU Rate Override.

TIP: Normally Load Profile channels may not be associated with Time of Use rates other than Total.
However, you may simulate a Load Profile channel that records only during a given rate period by
assigning it to a Totalization channel with the correct rate. The Totalization channel need not record any
external energy, making it essentially identical to an integrated Load Profile channel.

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 APPENDIX A
JEMSTAR DEFAULT SETTINGS
The following is a list of the factory default settings that will be seen in a JEMStar meter after a Cold
Start is performed. Use JEMWare software to program the meter with your custom configuration.

Meter Identification
ID String 1: (meter name)
ID String 2: (administrator)
ID String 3: (location)
ID String 4: (config id)
ID String 5: (acct number)
ID Label 1: Meter Name
ID Label 2: Administrator
ID Label 3: Location
ID Label 4: Config ID
ID Label 5: Acct Number

Primary Configuration
Nominal Voltage: 120V
Connection Type: 4-Wire Y
Reactive Power Unit: VAR
VT Ratio: 120:120
CT Ratio: 5:5
Register Scaling:
Watt, VA: Units
VAR, Q: Units
Volt: Volts
Amp: Amps

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JEMStar User Manual

Display Registers

Normal Registers
Num Type Qty Dir Phase Disp Rate Digits Decimal Label
001 Instant Volt A Working 6 2 Volts Phase A
002 Instant Volt B Working 6 2 Volts Phase B
003 Instant Volt C Working 6 2 Volts Phase C
004 Instant Amp A Working 6 3 Amps Phase A
005 Instant Amp B Working 6 3 Amps Phase B
006 Instant Amp C Working 6 3 Amps Phase C
007 Instant Watt Del Poly Working 6 2 Watts Del Total
008 Instant VAR Del Poly Working 6 2 VARs Del Total
009 Instant Freq Working 6 3 Line Freq
010 Instant VTHD A Working 6 3 Volts THD A
011 Instant VTHD B Working 6 3 Volts THD B
012 Instant VTHD C Working 6 3 Volts THD C
013 Instant ATHD A Working 6 3 Amps THD A
014 Instant ATHD B Working 6 3 Amps THD B
015 Instant ATHD C Working 6 3 Amps THD C
016 Instant Amp N Working 6 3 Amps Neutral
017 Time Time Working Present Time
018 Time Date Working Present Date

Alternate Registers
Num Type Qty Dir Phase Disp Rate Digits Decimal Label
101 Consumpt Watt Del Poly Working Total 6 3 kWh Del Poly R
102 Consumpt Watt Rec Poly Working Total 6 3 kWh Rec Poly R
103 Consumpt VAR Del Poly Working Total 6 3 kVARh Del Poly R
104 Consumpt VAR Rec Poly Working Total 6 3 kVARh Rec Poly R
105 Consumpt VA Del Poly Working Total 6 3 kVAh Del Poly R
106 Consumpt VA Rec Poly Working Total 6 3 kVAh Rec Poly R
107 Consumpt Q Del Poly Working Total 6 3 kQh Del Poly R
108 Consumpt Q Rec Poly Working Total 6 3 kQh Rec Poly R
109 Consumpt Amp Poly Working Total 6 3 Amph Poly R
110 Instant Watt Del Poly Working 6 1 kW Del Poly R
111 Time Demand Working Demand Time Remain
112 Time Battery Working Days on Battery
113 Status BPR Ct Working BPR Count

Test Registers
Num Type Qty Dir Phase Disp Rate Digits Decimal Label
201 Consumpt Watt Del Poly Working Total 6 3 kWh Del Poly T
202 Consumpt Watt Rec Poly Working Total 6 3 kWh Rec Poly T
203 Consumpt VAR Del Poly Working Total 6 3 kVARh Del Poly T
204 Consumpt VAR Rec Poly Working Total 6 3 kVARh Rec Poly T
205 Consumpt VA Del Poly Working Total 6 3 kVAh Del Poly T
206 Consumpt VA Rec Poly Working Total 6 3 kVAh Rec Poly T
207 Consumpt Q Del Poly Working Total 6 3 KQh Del Poly T
208 Consumpt Q Rec Poly Working Total 6 3 KQh Rec Poly T
209 Consumpt Amp Poly Working Total 6 3 Amph Poly T
210 Instant Watt Del Poly Working 6 1 Inst kW Del Poly T
211 Time Test Working Test Time Remaining

A-2
 Appendix A- Default Configuration

Load Profile
Interval Length: 15 minutes
Number of channels: 12 (only 4 are operational unless the Extended Load Profile option is
installed)
Interval Sync: Internal
Freeze Markers: Enabled
Channel 1: Watthours delivered polyphase, 0.5 Wh/count
Channel 2: VARhours delivered polyphase, 0.1 VARh/count
Channel 3: VAhours received polyphase: 0.5 VAh/count
Channel 4: Qhours delivered polyphase: 0.5 Qh/count
Channel 5: Amphours polyphase, 0.005 Ah/count
Channel 6: Average PF delivered phase A, 0.001 PF/count
Channel 7: Average Volts polyphase, 0.05 V/count
Channel 8: Average Amps polyphase, 0.015 A/count
Channel 9: Average Watts delivered polyphase, 1.8W/count
Channel 10: Average Frequency: 0.01 Hz/count
Channel 11: Average Volts distortion phase A, 0.01%/count
Channel 12: Average Amps distortion phase A, 0.01%/count

Time of Use Setup

No Seasons or Time of Use schedules configured
No Override Rate
No Holidays schedules

Timekeeping and DST Changes

Meter Clock Sync: Internal
Auto Register Freeze: none
Auto Billing Period Reset: none
Self Read: hourly
Register 001: Instantaneous, Volts, Phase A, working
Register 002: Instantaneous, Volts, Phase B, working
Register 003: Instantaneous, Volts, Phase C, working
Register 004: Instantaneous, Amps, Phase A, working
DST dates: none

Alarms
Site Monitor Alarms: none assigned
Threshold 1: none assigned
Threshold 2: none assigned
Threshold 3: none assigned
Threshold 4: none assigned

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JEMStar User Manual

Contact Input / Output

Input channel 1: TOU Rate Override
Input channel 2: TOU Rate Override
Output Channel 1: Energy Output, Normally Open, 1.8 Wh/pulse
Output Channel 2: Energy Output, Normally Open, 1.8 VARh/pulse
Output Channel 3: Energy Output, Normally Open, 1.8 VAh/pulse
Output Channel 4: Energy Output, Normally Open, 1.8 Qh/pulse
Output Channel 5: End of Interval (5-KYZ Option board only)

Analog Outputs
Analog Output 1: Volts Phase A, 0 - 530 V
Analog Output 2: Volts Phase B, 0 - 530 V
Analog Output 3: Volts Phase C, 0 - 530 V

Demands
Interval length: 15 minutes
Subinterval length: 15 minutes
Deferral intervals: 1 subinterval
Power Outage: Recognition after 8 seconds
Interval Sync: Internal
Thermal Time
Characteristic: 1 minute

Serial Communication
Optical: 9600 baud
JEM2 Binary protocol
Address = 01
Password timeout 15 min.
Serial 1: RS232
9600 baud
JEM2 Binary protocol
Address = 05
Password timeout 15 min.
TX start delay: 0mS (RS-232); 80mS (RS-485)
TX end delay: 0mS (RS-232); 20mS (RS-485)
Serial 2: Modem
9600 baud
JEM2 Binary protocol
Address = 02
Password timeout 15 min.
Initialization String: ATH

A-4
 Appendix A- Default Configuration

Modem answer schedule:

Frequency: daily
Start time: 0030
End time: 0100
Answer: after 1 ring in-window
Answer: after 1 ring out-of-window
Modem Phone Home settings: none
Modem Power Fail Phone Home settings: none

Display Setup
Preset mode timeout: 15 minutes
Test Mode timeout: 30 minutes
Demand Reset lockout:0
Display’s Number of Digits: 6
Scroll rate: 5 seconds
Date Format: MM/DD/YY
Threshold 1 alarm action: Ignore
Threshold 2 alarm action: Ignore
Threshold 3 alarm action: Ignore
Threshold 4 alarm action: Ignore
Site alarm action: Ignore

Passwords / Permissions
Master Password permissions are always “all”
Password 2 permissions: none
Password 3 permissions: none
Password 4 permissions: none
All passwords set to “000000” (six zeros)

TLC
Loss Compensation disabled

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JEMStar User Manual

bits of the "A" and "T." The modem then returns

Internal Modem Initialization result codes at the host's speed and parity.
Commands Command Line - A command line may include
Modes of Operation multiple commands. The modem executes the
The Xecom™ XE1414B uses "AT" commands for commands in the sequence they appear in the
control and configuration. The XE1414B operates command line. Spaces, inserted to improve
in three modes; Command Mode, Fax Mode and legibility, do not fill space in the command buffer.
Data Mode. Extensions to the AT command set A carriage return terminates the command line and
support fax operation. causes the commands to be executed.
Register S3 allows the user to select a character
Data Mode: The modem enters data mode after it other than a carriage return to terminate the
establishes a link and issues a "CONNECT" result command line.
code.
In Data Mode the modem modulates all signals on Command Buffer - The command buffer holds 40
Transmit Data, Pin 13, and sends them to the remote characters, including the AT prefix. If it overflows,
modem. The modem demodulates the signal from the modem issues an "ERROR" result code and
the remote modem and places it onto Received commands are not executed.
Data, Pin 3, for the host equipment. When the
modem exits data mode, it issues a "NO CARRIER" Command Line Editing - A backspace can be used
result code. to edit the command any time before it is executed.
The backspace character, Control and H
Command Mode: The XE1414B enters command simultaneously on some systems, erases the
mode on application of power, reset, loss of the previous character in the command line. Any
connection, or receipt of the escape sequence. In character except for the "A" and "T" can be erased.
command mode the modem accepts commands Register S5 allows the user to select a character
from the host on Transmit Data. Appropriate result other than a backspace to edit the command line.
codes are returned on Received Data at the same
speed and parity as the commands. Re-Execute Last Command - The A/ command
causes the modem to re-execute the command line
Fax Mode: The modem enters fax mode on receipt stored in the command buffer. This is the only
of the AT+FCLASS=1 command. Fax commands command that does not require the "AT" prefix.
and responses are issued at 19,200 bits per second;
the character format is 8 bits no parity. The modem Omitted Parameters - Most commands include a
accepts Class 1 Fax commands only in fax mode. parameter which determines the command function.
The A/, ATO, AT&T and escape commands are not When the parameter is omitted from the command
valid in fax mode. string, it is assumed to be a 0.

Commands Escape Characters - A three character escape

The modem is configured and controlled with AT sequence, entered while in data mode, will switch
commands. AT commands follow a strict format. the modem into command mode while remaining on
The command line is stored in the command buffer line. The escape character, set by Register S2, is
and executed upon receipt of a carriage return. Until entered 3 times in succession to execute the escape.
executed, the command line can be edited with the The default escape sequence is "+++."
backspace key.
Result Codes - The modem issues a result code
Command Format - Each command, except A/, after each action. Result codes may be provided as
begins with the AT prefix. The "A" and "T" may be full words, numeric codes or may be disabled. Each
both upper case or both lower case but cannot be of result code ends with a carriage return when
different cases. The modem uses the prefix to numeric result codes are chosen. When full word
identify the host's speed and parity. The modem result codes are chosen, a Line Feed and Carriage
determines speed by measuring the width of the Return precede and follow each result code.
incoming bits and parity by comparing the parity
A-6
 Appendix A- Default Configuration

List of Commands n=3 Speaker off during dialing, on until carrier

An asterisk indicates the default setting of the command Nn - Data Rate - ATNn selects whether or not the
for the XE1414B. modem
will negotiate a lower data link speed.
A - Answer Command - ATA forces the modem to n=0 Handshake only at DTE rate
immediately go off-hook and begin transmitting the n=1 Negotiate highest common speed*
answer tone sequence.
On - On Line - ATOn switches the modem from the
Bn - Select Communications Standard - ATBn selects command mode to the data mode.
the n=0 Return On Line with no retrain*
modulation scheme used for connections below 2400 bits n=1 Initiate retrain returning On Line.
per
second Qn - Responses - ATQn determines if the modem will
n=0 Selects CCITT standards issue
n=1 Selects Bell standards* responses.
n=0 Send responses*
D - Dial Command - Below are the characters accepted n=1 No Responses
in a
dialing command. Sr? - Interrogate Register - ATSr? requests the current
0-9, #, * = Dialing Digits value in register Sr.
L = Re-dial last number Sr=n - Set Register Value - ATsr=n sets the value of
P = Pulse dial register Sr to n.
T = Tone dial
S=n = Dial stored number Vn - Result Codes - ATVn sets the modem to issue
W = Wait for dial tone Numeric
^ = Toggles state of calling tone or Full Word result codes.
, = Pause for the duration of S8 n=0 Numeric Result Codes
@ = Wait for silence n=1 English Word Result Codes*
! = Switch hook flash
; = Return to the command state Wn - Connect Message Rate - ATWn determines
whether
En - Command Echo - ATEn determines whether the data rate reported in the Connect response is the host
commands will be echoed back to the host. data
n=0 Do not echo commands rate, the link data rate or whether both are provide along
n=1 Enable command echo* with
the error control and data compression protocols
Hn - Switch Hook Control - ATHn opens and closes the negotiated.
modem's hook switch. n=0 Send "CONNECT" at DTE Rate*
n=0 Switch hook relay opens n=1 Report line speed, DTE speed and Link protocol
n=1 The switch hook relay closes n=2 "CONNECT" Reports Link speed

In - Modem Identification - ATIn Identifies the version Xn - Result Code Set - ATXn selects which set of result
of codes the modem may send.
the modem. n=0 Result codes 0 to 4
n=1 Result codes 0 to 5 and 10
Ln - Speaker Volume - ATLn sets the amplitude of the n=2 Result codes 0 to 6 and 10
modem's audio output. n=3 Result codes 0 to 5, 7 and 10
n=0 Lowest speaker volume n=4 Full Result codes*
n=1 Low speaker volume*
n=2 Moderate speaker volume Yn - Long Space Disconnect - ATYn determines if the
n=3 High speaker volume modem will automatically disconnect if a continuous
space is received for 1.6 seconds.
Mn - Speaker Activity - ATMn determines when the n=0 Long Space Disconnect Disabled*
modem's audio output is active. n=1 Disconnect on long space
n=0 Speaker off
n=1 Speaker on until carrier received*
n=2 Speaker remains on
A-7
JEMStar User Manual

Zn - Reset - ATZn executes a soft reset to the modem &Tn - Test Modes - AT&T selects modem test modes.
and resets the modem configuration. n=0 Exit test mode
n=0 Reset to user profile 0* n=1 Local analog loopback
n=1 reset to user profile 1 n=3 Initiate local digital loopback
n=4 Respond to remote loop request*
&Cn - DCD Operation - AT&Cn determines the n=5 Deny remote loop request
operation n=6 Initiate a Remote Digital loopback
of the DCD output. n=7 Remote digital loopback w self-test
n=0 DCD is forced active. n=8 Local analog loopback w self-test
n=1 DCD indicates a valid carrier* &Vn - View Configuration Profiles - AT&V permits
the
&Dn - DTR - AT&Dn determines how the modem will user to check on the modems current configuration.
respond to changes to DTR. n=0 View active profile & user profile 0*
n=0 DTR is ignored by the modem. n=1 View active profile & user profile 1
n=1 Enter command mode if DTR revoked.
n=2 Disconnect if DTR revoked.* &Wn - Store Active Profile - AT&Wn stores the current
n=3 Soft reset when DTR revoked modem configuration in NVRAM.
n=0 Store active profile as profile 0*
&Fn - Return to Factory Defaults - AT&Fn returns the n=1 Store active profile as profile 1
modem configuration to one of two factory
configurations. &Yn - Recall Stored Profile - AT&Yn sets the stored
n=0 Restore configuration 0* modem configuration to be used after a hard reset.
n=1 Restore configuration 1 n=0 Recall profile 0 on power-up*
n=1 Recall profile 1 on power-up
&Gn - Guard Tone - AT&Gn controls the guard tone
produced by the modem &Zn=x - Store telephone number "x" in
n=0 Guard Tone Disabled* memory location "n"
n=1 Guard Tone Disabled
n=2 1800 Hz Guard Tone %En - Line Quality Monitor/Auto Retrain - AT%En
determines if the modem will monitor line quality during
&Kn - Flow Control - AT&Kn selects the flow control a
method used by the modem. connection and initiate a retrain if quality drops below
n=0 Disabled acceptable levels.
n=3 RTS/CTS n=0 Disabled
n=4 XON/XOFF n=1 Enabled
n=5 Transparent XON/XOFF n=2 Line quality, fallback, fall forward
n=6 RTS/CTS and XON/XOFF n=3 33/67% @ 20 pps

&Pn - Dial Pulse Make/Break Ratio - AT&Pn %L - Read Received Signal Level - AT%L permits the
determines user to read the magnitude of the receive signal in dBm.
the specific pulse dialing parameters used by the modem.
n=0 39/61% @ 10 pps* %Q - Read Line Signal Quality - AT%Q permits the
n=1 33/67% @ 10 pps user
n=2 39/61% @ 20 pps to read the EQM value of the received signal.

&Qn - Line Connection - AT&Qn determines if error \An - MNP Block Size - AT|An sets the block size for
control or data buffering are active on the link. MNP
n=0 Direct mode (no data buffering)* data packets.
n=5 Use Error Correction n=0 Maximum 64 characters
n=6 Normal Mode (Speed buffering) n=1 Maximum 128 characters
n=2 Maximum 192 characters
&Sn - DSR Operation - AT&Sn sets the operation of n=3 Maximum 256 characters*
the
DSR signal. \Bn - Transmit Break - AT\Bn selects the duration of the
n=0 DSR always active* break signal sent. Break = n x 100 msec.
n=1 DSR in accordance with V.25.

A-8
 Appendix A- Default Configuration

\Gn - Modem Port Flow Control – -Kn - MNP Extended Services - AT-Kn determines how
n=0 No Modem Port Flow Control the
n=1 XON/XOFF Port Flow Control modem handles MNP10.
n=0 No LAPM to MNP10 conversion
\Kn - Break control - AT\Kn determines how the modem n=1 LAPM to MNP10 conversion*
will n=2 LAPM to MNP10 conversion but no MNP
handle a break signal. Extended Service during V.42 LAPM answer
mode detect.
Break received from host with Reliable link.
n=0 Enter on-line command mode; do not transmit S0 Answer on nth Ring: S0 sets the modem to
break automatically
n=1 Purge buffers, immediately transmit break answer on the nth ring. Setting S0 to 0 disables automatic
n=2 Same as n=0 answer.
n=3 Immediately send break Range: 0 to 255
n=4 same as n=0 Units Rings
n=5 Send break in sequence with data* Default 0

Break received from host with Direct link . S1 Ring Count: S1 is a read-only register showing the
n=0 Immediately transmit break, then enter on-line number of rings detected. If a ring is not detected
command mode within 8 seconds, S1 is reset to zero.
n=1 Immediately send break Range: 0 to 255
n=2 Enter command mode but do not transmit Units Rings
break signal Default 0
n=3 same as n=1
n=4 ame as n=0 S2 Escape Character: S2 determines the ASCII escape
n=5 same as n=1* character. Values of 0-127 select valid ASCII escape
characters; values from 128 to 255 disable the escape
Break received from modem w Normal link. sequence.
n=0 Purge buffers, Immediately send break to the Range: 0 to 255
host Units ASCII Character
n=1 same as n=0 Default 43 (+)
n=2 Immediately send break to the host
n=3 Same as n=2 S3 Carriage Return Character: S3 determines the
n=4 Send break in sequence with data. ASCII character to serve as a carriage return to terminate
n=5 Same as n=2* commands and modem responses.
Range: 0 to 127
Host initiates break with \B command on Reliable Units ASCII Character
link. Default 13 (Carriage Return)
n=0 Purge buffers and immediately transmit break
n=1 Same as n=0 S4 Line Feed Character: S4 sets the ASCII character
n=2 Immediately transmit break to act as a line feed character in modem responses.
n=3 Same as n=1 Range: 0 to 127
n=4 Transmit break in sequence w data Units ASCII Character
n=5 Same as n=4 Default 10 (Line Feed)

\Nn - Error Control Selection - AT\Nn determines how S5 Back Space Character: S5 defines the ASCII
the character
modem will handle error control negotiations. used as a backspace to edit the command line.
n=0 Normal mode, no error correction Range: 0 to 32
n=1 Direct mode, no buffering, no error correction Units ASCII Character
n=2 Reliable mode, error correction required for Default 8 (Back Space)
connection
n=3 V.42 Auto-reliable mode, accept either an
error controlled or non-error controlled link*
n=4 V.42 Reliable mode, LAPM required
n=5 MNP required

A-9
JEMStar User Manual

S6 Dial Tone Wait Time: S6 determines how long the S14 General Bit-Mapped Options: S14 reflects the
modem waits for dial tone before dialing begins. The state of several "AT" commands.
Dial Tone Wait Time cannot be set to less than two Bit 0,4,6 Not Used
seconds. Bit 1 0 = Echo Disabled (ATE0)
Range: 2 to 255 1 = Echo Active (ATE1)
Units Seconds Bit 2 0 = Send Result Codes (ATQ0)
Default 2 1 = No Result Codes (ATQ1)
Bit 3 0 = Numeric Result Codes (ATV0)
S7 Wait for Carrier after Dialing: S7 determines how 1 = Full Word Result Codes (ATV1)
long the modem waits for a valid carrier signal after Bit 5 0 = Tone Dialing Selected (T)
dialing is completed. 1 = Pulse Dialing Selected (P)
Range: 1 to 255 Bit 7 0 = Answer
Units Seconds 1 = Originate
Default 50 S16 Test Status: S16 shows the modem test status.
Bit 0 0 = No Local Analog Loopback
S8 Comma Pause Time: S8 defines the duration of the 1 = Local ALB Active
pause initiated by a comma in the dialing string. The Bit 1 Not Used
pause is generally used when waiting for a second dial Bit 2 0 = Local Digital Loopback Disabled
tone. 1 = Local DLB Enabled
Range: 1 to 255 Bit 3 0 = No Remote Digital Loopback
Units Seconds 1 = Remote DLB Active
Default 50 Bit 4 0 = Remote DLB not requested
1 = Remote DLB Requested
S9 Carrier Detect Response Time: S9 establishes the Bit 5 0 = Remote DLB w Self-Test Disabled
length of time the remote modem's carrier must be 1 = Remote DLB w Self-Test Enabled
present to be recognized as valid. Bit 6 0 = Local ALB w Self-Test Disabled
Range: 1 to 255 1 = Local ALB w Self-Test Enabled
Units 0.1 Seconds Bit 7 Not Used
Default 6
S18 Test Timer: S18 sets the duration of any test. If S18
S10 Carrier Off Disconnect Delay: S10 selects how equals 0, AT&T0 terminates the test.
long carrier must be lost before the modem disconnects. Range: 0 to 255
Note: If S10 is smaller than the value of S9, the modem Units Seconds
will not automatically disconnect on loss of carrier. Default 0
Range: 1 to 255
Units 0.1 Seconds S21 General Bit-Mapped Options: S21 reflects the
Default 14 state
of several "AT" commands.
S11 Tone Dialing Speed: S10 sets the duration and Bit 0-2 Not Used
spacing Bit 3,4 0 = DTR ignored (&D0)
of the dialing tones. S11 does not affect the pulse dialing 1 = Enter command mode on DTR off
rate. (&D1)
Range: 50 to 255 2 = Disconnect on DTR off (&D2)
Units 1 Millisecond 3 = Reset on DTR off (&D3)
Default 95 Bit 5 0 = DCD always active (&C0)
1 = DCD on with Carrier (&C1)
S12 Escape Code Guard Timer: S12 sets the escape
sequence guard timer. If characters are received before
or after the escape sequence, within the guard timer,
the modem aborts the escape attempt and remains in
data mode.
Range: 0 to 255
Units 0.02 Seconds
Default 50

A-10
 Appendix A- Default Configuration

S22 General Bit-Mapped Options: S22 reflects the state S28 Pulse Dialing Bit-Mapped Options: S28 stores the
of several "AT" commands. modem's pulse dialing configuration.
Bit 0-1 0 = Low speaker volume (ATL0) Bit 0-2, 5-7 Not Used
1 = Low speaker volume (ATL1) Bit 3-4 0 = Make/Break ratio 39%/61%; 10
2 = Moderate speaker volume (ATL2) pulses per second (AT&P0)
3 = High speaker volume (ATL3) 1 = Make/Break ratio 33%/67%; 10
Bit 2-3 0 = Speaker off (ATM0) pulses per second (AT&P1)
1 = Speaker off with carrier (ATM1) 2 = Make/Break ratio 39%/61%; 20
2 = Speaker always on (ATM2) pulses per second (AT&P2)
3 = Speaker on during handshake 3 = Make/Break ratio 33%/67%; 20
(ATM3) pulses per second (AT&P3)
Bit 4-6 0 = Basic Result codes (ATX0)
4 = Connect speed result codes (ATX1) S29 Hook Flash Timer: S29 determines the length for
5 = No Blind Dial (ATX2) time the modem closes its off-hook relay on receipt
6 = Busy Detection (ATX3) of the "!" dial modifier to simulate a switch hook
7 = Full result codes (ATX4) flash.
Bit 7 Not Used Range: 0 to 255
Units 10 milliseconds
S23 General Bit-Mapped Options: S23 reflects the Default 70
state
of several "AT" commands. S30 Disconnect on Inactivity Timer: S30 sets the
Bit 0 0 = Remote DLB Disabled (AT&T5) period and the modem is idle before it disconnects.
1 = Remote DLB Allowed (AT&T4) A 0 disables the inactivity timer.
Bit 1-3 0 = Host Interface at 300 bps Range: 0 to 255
1 = Host Interface at 600 bps Units 10 Seconds
2 = Host Interface at 1200 bps Default 0
3 = Host Interface at 2400 bps
4 = Host Interface at 4800 bps
5 = Host Interface at 9600 bps S31 General Bit-Mapped Options: S31 stores the status
6 = Host Interface at 19200 bps of various AT commands.
7 = Host I/F at 38400 bps or higher Bit 0 0 = No single-line Connect messages
Bit 4-5 0 = Even parity in use (AT\V0)
1 = Not used 1 = Use single-line connect messages
2 = Odd Parity in use (AT\V1)
3 = No Parity in use Bit 1 0 = No Automode detection (ATN0)
Bit 6-7 0 = No Guard Tone (AT&G0) 1 = Automode detection active (ATN1)
1 = No Guard Tone (AT&G1) Bit 2-3 0 = Report host speed (ATW0)
2 = 1800 Hz guard tone (AT&G2) 1 = Report all parameters (ATW1)
3 = Not Used 2 = Report modem speed only (ATW2)
Bit 4-7 Not Used
S27 General Bit-Mapped Options: S27 reflects the S32 XON Character: S32 determines the ASCII
state of several "AT" commands. character
Bit 0 1 3 to be sent as XON for in-band flow control.
0 0 0 = Normal Mode (AT&Q0) Range: 0 to 255
1 0 1 = Error control enabled (AT&Q5) Units ASCII Character
0 1 1 = Direct Mode (AT&Q6) Default 11 (VT)
Bit 2, 4-5, 7 Not Used
Bit 6 0 = CCITT Protocols (ATB0) S33 XOFF Character: S32 determines the ASCII
1 = Bell Protocols (ATB1) character
to be recognized as XOFF for in-band flow control.
Range: 0 to 255
Units ASCII Character
Default 19 (DC3)

A-11
JEMStar User Manual

S36 LAPM Failure: S36 instructs the modem what to do S41 General Bit-Mapped Options: S41 stores the
if the error control negotiations fail. condition
Bit 0-2 0 = Modem Disconnects of various "AT" commands.
1 = Establish Direct Connection Bit 0-1 0 = No Data Compression (AT%C0)
3 = Establish normal Connection 1 = MNP5 Data Compression
4 = Disconnect if MNP handshake fails (AT&C1)
5 = Establish Direct Connection if 2 = V.42bis Data Compression
MNP handshake fails. (AT&C2)
7 = Establish Normal Connection if 3 = Either MNP5 or V.42bis Data
MNP handshake fails. Compression (AT&C3)
Bit 3-7 Not Used Bit 2, 6
0 0 = No Fallback/Forward (AT%E0)
S38 Forced Disconnect Timer: S38 sets the delay 1 0 = Retrain Enabled (AT%E1)
between 0 0 = Fallback/Forward Enabled
receipt of the command to disconnect and the actual (AT%E2)
opening of the switch hook. If S38 is set to 255, the
modem disconnects only after its buffers are empty. Bit 3-5, 7 Not Used
Range: 0 to 255
Units 1 Second S46 Data Compression Control: S46 selects whether or
Default 20 not the modem will support data compression with error
control.
S39 Flow Control Bit-Mapped Options: S39 shows the S46=136 No data compression
modem's flow control status, AT&K. S46=138 Data Compression selected
Bit 0-2 0 = Flow Control Disabled Default 38
3 = Hardware Flow Control, RTS/CTS
4 = In-Band Flow Control XON/XOFF S48 V.42 Negotiations: S48 determines the modem's
5 = Transparent In-Band Flow Control V.42
6 = Both Hardware and In-Band Flow negotiation process.
Control S48=0 Proceed with LAPM
Bit 3-7 Not used S48=7 Negotiate per V.42
S48=128 Assume LAPM failure
S40 MNP Bit-Mapped Options: S40 shows the status of Default 7
the modem's MNP commands, .
Bit 0-1 0 = No LAPM to MNP10 conversion
(AT-K0) S86 Call Failure Code: S86 shows why the last "NO
1 = Enable LAPM to MNP10 CARRIER response was issued.
conversion (AT-K1) S86=0 Normal Disconnect
2 = Enable LAPM to MNP10 S86=4 Loss of Carrier
conversion except for LAPM S86=5 V.42 Negotiation Failure
answer mode (AT-K1) S86=9 Modem Handshake Failure
Bit 2 Not Used S86=12 Disconnect Initiated by remote modem
Bit 3-5 0 = AT\K0 break handling selected S86=13 No response after 10 retries
1 = AT\K1 break handling selected S86=14 Protocol Violation
2 = AT\K2 break handling selected
3 = AT\K3 break handling selected S95 Extended Result Codes: S95 permits the user to
4 = AT\K4 break handling selected customize the extended result codes.
5 = AT\K5 break handling selected Bit 0 Connect result code shows link speed
Bit 6-7 0 = MNP Block size 64 characters Bit 1 Add /ARQ to connect response
1 = MNP Block size 128 characters Bit 2 Add /VFC to Carrier response
2 = MNP Block size 192 characters Bit 3 Enable Protocol response
3 = MNP Block size 256 characters Bit 4 Not Used
Bit 5 Enable Compression Result Code
Bit 6 Not used
Bit 7 Not Used

AT+FCLASS? - Service Class Indication

0 = Configured as a data modem
1 = Configured for Service Class 1.

A-12
 Appendix A- Default Configuration

AT+FCLASS=? - Service Class Capability

0 = Configured as a data modem
1 = Configured for Service Class 1.

AT+FCLASS=n - Set Service Class

0 = Configured as a data modem
1 = Configured for Service Class 1.

AT+FAE=n - Data/Fax Auto Answer

0 = Answer as a fax modem only
1 = Either a fax or data modem

AT+FF - Enhanced Flow Control

AT+FRH<mod> - Receive HDLC Data

3 V.21 Channel 2, 300 bps
24 V.27ter, 2400 bps
48 V.27ter, 4800 bps
72 V.29, 7200 bps
96 V.29, 9600 bps
97 V.17, 9600 bps
98 V.17 short train, 9600 bps
121 V.17, 12,000 bps
122 V.17 short train, 12,000 bps
145 V.17, 14,400 bps
146 V.17 short train, 14,400 bps

AT+FRM<mod> - Receive Fax

(see AT+FRH for "mod" values)

AT+FRS<time> - Receive Silence

AT+FRTn - Receive Test Data

AT+FTH<mod> - Transmit HDLC Data

(see AT+FRH for "mod" values)

AT+FTM<mod> - Transmit Fax

(see AT+FRH for "mod" values)

AT+FTS<time> - Transmit Silence

AT+FTTn - Transmit Test Data

A-13
JEMStar User Manual

Digits Verbose Description Digits Verbose Description

0 OK Successfully executed 50 CARRIER 9600 9600 bps carrier
command line received

1 CONNECT 300 bps connection 51 CARRIER 12000 12,000 bps carrier

received
2 RING Ring signal detected
52 CARRIER 14400 14,400 bps carrier
3 NO CARRIER Carrier not received
detected/lost
53 CARRIER 16800 16,800 bps carrier
4 ERROR Error in command line received

5 CONNECT 54 CARRIER 19200 19,200 bps carrier

received
6 NO DIAL TONE No dial tone detected
55 CARRIER 21600 21,600 bps carrier
7 BUSY Busy signal detected received

8 NO ANSWER 5 second silence not 56 CARRIER 24000 24,000 bps carrier

detected received

10 CONNECT 2400 2400 bps Connection 57 CARRIER 26400 26,400 bps carrier
received
11 CONNECT 4800 4800 bps Connection
58 CARRIER 28800 28,800 bps carrier
12 CONNECT 9600 9600 bps Connection received

13 CONNECT 7200 7200 bps Connection 59 CONNECT 16800 16,800 bps Connection

14 CONNECT 12000 12,000 bps Connection 61 CONNECT 21600 21,600 bps Connection

15 CONNECT 14400 14,400 bps Connection 62 CONNECT 24000 24,000 bps Connection

16 CONNECT 19200 19,200 bps Connection 63 CONNECT 26400 26,400 bps Connection

17 CONNECT 38400 38,400 bps Connection 64 CONNECT 28800 28,800 bps Connection

18 CONNECT 57600 57,600 bps Connection 66 COMPRESSION:

CLASS 5 MNP5 data compression
19 CONNECT 115200 115200 bps Connection
67 COMPRESSION: V.42bis V.42bis data compression
22 CONNECT 75TX/1200RX V.23 originate
connection 69 COMPRESSION: NONE No data compression

23 CONNECT 1200TX/75RX V.23 answer connection 76 PROTOCOL: NONE No error correction

33 FAX Fax connection 77 PROTOCOL: LAPM LAPM error correction

35 DATA Connection in Fax 80 PROTOCOL: ALT MNP error correction

mode
81 PROTOCOL:
40 CARRIER 300 300 bps carrier received ALT CELLULAR MNP10 error correction

44 CARRIER 1200/75 V.23 reverse channel +F4 +FCERROR Fax carrier error
carrier received

45 CARRIER 75/1200 V.23 forward channel

carrier received

46 CARRIER 1200 1200 bps carrier

received
47 CARRIER 2400 2400 bps carrier
received

48 CARRIER 4800 4800 bps carrier

received

49 CARRIER 7200 7200 bps carrier

received

A-14
 APPENDIX B
ACCESSORIES
The following is a list of user replaceable parts. Please contact the factory for further information.

Description Part Number

Phone Home Power Outage battery pack 15847-001
Non-Volatile RAM backup battery 6005-254
Security jumpers (for front panel lockout) 4195-263

S-base outer globe (w/pushbuttons) 1082-419

S-base to A-base adapter assembly 6002-656
A-base adapter locking ring 12648-001
Switchboard front cover assembly 1083-452
Switchboard case thumbscrew 1083-425

Optical Pickup Assembly Consult factory

Modem cable (3 ft.), S-base unit 1082-448

I/O interface cable (3 ft.), S-base unit 1082-447

JEMStar User Manual 1083-600

JEMWare Meter Configuration Software Manual 1083-602
JEMRead Data Retrieval Software Manual 1083-601
JEMStar Firmware Command Set Manual 1083-603

Replacement Circuit Boards* Consult factory

*When ordering spare or replacement circuit boards, please have the meter’s Model Number and Serial
Number available.

B-1
 APPENDIX C
ELECTROSTATIC DISCHARGE
ELECTROSTATIC DISCHARGE PREVENTION
Static, by definition, is designating or producing stationary electrical charges such as those resulting from
friction. An electrostatic potential is produced by friction between nonconductive materials and can best
be visualized as a field between two charged plates. The electrostatic potential will exist until the
difference in the potential is overcome.

All meter shop work must be performed at static-protected work stations following properly prescribed
static-control practices. Unless controlled, electrostatic discharge can destroy or weaken solid-state
electronic components and assemblies.

Failure Mode
Failure of a solid-state component due to static discharge is characterized by partial or complete
destruction of a semiconductor junction or a microscopic resistive or capacitive element within a circuit
device. Failure is most common in CMOS, very low-energy devices.

Destruction of a circuit is immediately detectable and is remedied by normal troubleshooting and repair
methods. However, the common condition of partial damage induced by low-level static discharge is not
immediately detectable. Thus, the damaged component may continue to operate normally, but in a
weakened state. Repeated exposure of the same component to similar low levels of static discharge may
produce cumulative damage, ultimately leading to failure.

Static damage can be avoided by practical methods accessible to anyone handling solid-state components
or assemblies.

Completely assembled products are only minimally vulnerable to static damage, and then only under the
most severe of static-prone environments. Consequently, completely assembled products can usually be
handled in normal work environments, indoors and outdoors, with little risk of static damage.

If a product is disassembled to any level, all exposed or removed electronic modules must be considered
vulnerable to static damage and handled accordingly. There is no truly safe level of exposure to
electrostatic discharge. However, the presence of a static charge or static field is not, in itself, damaging
to electronic components.

Subassemblies from a dismantled product should not be considered static protected by design. In fact,
depending on the design and conductive mass of the connected circuitry, components in subassemblies
may be more vulnerable to static damage than loose components of the same type. Therefore, the
objectives of static control cannot be met by indiscriminate handling of subassemblies or loose
components.

C-1
JEMStar User Manual

Handling a printed-circuit-board assembly by its edges without employing static protection does not
preclude the risk of static damage to its components. Effective static- control methods cannot be
executed without proper tools and equipment.

All static-control methods relate to one simple principle: provide alternate, intentional paths for
grounding electrostatic charges away from or around the devices to be protected. Static control is the
employment of tools and equipment to predetermine the flow path of this current.

Any two physical bodies, conductive or nonconductive, can be the source of an electrostatic discharge if
either is charged to a different level of electrostatic potential. As these two physical bodies come in
contact or proximity, equilibrium is achieved by a sudden flow of current.

Most people associate a static discharge with a small blue arc and a sharp snapping noise. It is important
to note that static charges of a level too low to produce a detectable arc can still damage unprotected
electronic components.

Another important consideration is that even though a safe encounter has been achieved between two
physical bodies, any subsequent encounter with a third, fourth, or more bodies must be protected in the
same manner since a static potential difference may exist between the, now combined, first two bodies
and any unknown new body.

Warning!
The first step in the above example is to de-energize the meter so that the meter is completely
isolated from all service lines. Never dismantle an energized meter.

The following static-control equipment is required:

1. Conductive work mat
2. Ground cord attached to true earth ground
3. Conductive wrist strap
4. Electrically conductive bag

Caution!
Unless you are certain that the meter enclosure is properly earth bonded, do not attach the ground
cord to the meter enclosure. Never attach a ground cord to the distribution system neutral or any
other point inside the meter enclosure, as this can present a serious safety hazard.

Attach the conductive work mat and the conductive wrist strap to the ground cord. Put on the wrist strap
and remove the assembly from the meter. If work is to be performed on the assembly at the metering
site, perform it on the grounded work mat.

If the assembly is to be transported to the meter shop or other off-site location, insert the assembly into a
conductive, antistatic bag for safe transportation. If the assembly has a battery installed, remove the
battery before inserting into the bag for transportation. Conductive, antistatic bags can cause a battery to
discharge during the transportation process.

C-2
 Appendix C- Electrostatic Discharge

If sensitive components are removed from the assembly at the meter site and are to be reused, insert the
components—with all component leads piercing into a piece of conductive foam carrier—into an
antistatic bag for safe transportation.

Static kits including mat, wrist strap, cord, and clip are available through your local electronics supplier.

C-3
 Appendix D - DNP Serial Communications

APPENDIX D
DNP SERIAL COMMUNICATIONS
INTRODUCTION
Distributed Network Protocol (DNP 3.0) is an industry standard protocol for SCADA communications
between Master Stations, Host computers, Remote Terminal Units, and Intelligent Electronics Devices
(such as the JEMStar meter). It is a public domain, non-proprietary protocol based on the IEC-870
standards, and is intended primarily for use in SCADA-like systems.

DNP as a protocol provides efficient, robust data communications through a system of 32-bit data link
CRCs (Cyclical Redundancy Checks) and confirmation messages. However, DNP is much more than an
error-detection-and-correction scheme. A DNP-compliant device, from the protocol's point of view, is
considered a group of data "objects", each of which contains one or more "points". The DNP protocol
specification defines the allowable object types and what constitutes a "point" for that object type.

DNP is not intended to be a general-purpose two-way communications link. Rather, it is highly

optimized for SCADA and automation applications involving relatively small amounts of near-real-time
data that is often read by the DNP master every few seconds. In the case of the JEMStar, it is not used as
a means of controlling or reconfiguring the meter.

D-1
 JEMStar User Manual

DNP V3.00 DEVICE PROFILE

The purpose of this document is to describe the specific implementation of the Distributed Network
Protocol (DNP) 3.0 within the JEMStar meter. This document, in conjunction with the DNP 3.0 Basic 4
Document Set, and the DNP Subset Definitions Document, provides complete information on how to
communicate with the JEMStar meter via the DNP 3.0 protocol.

JEMStar uses the Triangle MicroWorks™, Inc. DNP 3.0 Slave Source Code Library Version 2.19. This
implementation of DNP 3.0 is fully compliant with DNP 3.0 Subset Definition Level 2, contains many
Subset Level 3 features, and contains some functionality even beyond Subset Level 3.

The following sections, in conjunction with the Device Profile Document, provide a complete
interoperability/configuration guide for the JEMStar meter:
• the Implementation Table
• the Point List Tables
• Configuration methods

DNP V3.00
DEVICE PROFILE DOCUMENT

Vendor Name: AMETEK Power Instruments

Device Name: JEMStar, using the Triangle MicroWorks, Inc. DNP 3.0 Slave Source Code Library, Ver 2.19
Highest DNP Level Supported: Device Function:

For Requests: Level 2 … Master

For Responses: Level 2 7 Slave
Notable objects, functions, and/or qualifiers supported in addition to the Highest DNP Levels Supported (the complete
list is described in the attached table):

For static (non-change-event) object requests, request qualifier codes 00 and 01 (start-stop), 07 and 08 (limited
quantity), and 17 and 28 (index) are supported in addition to request qualifier code 06 (no range – or all points).
Static object requests received with qualifiers 00, 01, 06, 07, or 08, will be responded with qualifiers 00 or 01.
Static object requests received with qualifiers 17 or 28 will be responded with qualifiers 17 or 28. For change-
event object requests, qualifiers 17 or 28 are always responded.

The read and write function code for Object 50 (Time and Date), variation 1, is supported.
Maximum Data Link Frame Size (octets): Maximum Application Fragment Size (octets):

Transmitted: 292 Transmitted: 2048

Received 292 Received: 2048
Maximum Data Link Re-tries: Maximum Application Layer Re-tries:
Configurable from 0 to 255 – Via JEMWare None

Requires Data Link Layer Confirmation:

Configurable as: Never, Only for multi-frame messages, or Always via JEMWare
Requires Application Layer Confirmation:
When sending multi-fragment responses
Sometimes

D-2
 Appendix D - DNP Serial Communications

DNP V3.00
DEVICE PROFILE DOCUMENT

Timeouts while waiting for:

Data Link Confirm: Configurable via JEMWare
Complete Appl. Fragment: None
Application Confirm: Configurable via JEMWare
Complete Appl. Response: None

Others:
Transmission Delay: Configurable, via JEMWare
Inter-character Timeout: 1 sec.
Need Time Delay: Configurable, via JEMWare
Frozen Counter Event scanning period: FIXED AT 5 seconds

Sends/Executes Control Operations:

WRITE Binary Outputs Never

SELECT/OPERATE Never
DIRECT OPERATE Never
DIRECT OPERATE – NO ACK Never

Count > 1 Never

Pulse On Never
Pulse Off Never
Latch On Never
Latch Off Never

Queue Never
Clear Queue Never

Reports Binary Input Change Events when no Reports time-tagged Binary Input Change Events when no
specific variation requested: specific variation requested:
Never Never

Sends Unsolicited Responses: Sends Static Data in Unsolicited Responses:

Never Never
No other options are permitted.
Default Counter Object/Variation: Counters Roll Over at:
Default Object: 20 32 Bits
Default Variation: 5 Other Value: 999,999,999
Point-by-point list attached Point-by-point list attached
Sends Multi-Fragment Responses:
Yes

D-3
JEMStar User Manual

THE JEMSTAR IMPLEMENTATION

The JEMStar DNP implementation conforms to the standard for a Level II slave device, with some
additions. Implementation consists of the following static objects:

• Up to 40 Single-bit Binary Input without flag (Object 1 Variation 1)

• Up to 120 32-bit analog input without flag points (Object 30 Variation 3)
• A configurable number (up to 64) of 32-bit counters (Object 20 Variation 5) that can be assigned
to any register in the Normal or alternate display set
• A corresponding number of 32-bit frozen counter without flag (Object 21 variation 5) that
represent the values of the counter points at the time of the last meter freeze

IMPLEMENTATION TABLE
The following table identifies the variations, function codes, and qualifiers supported by the JEMStar
meter in both request messages and in response messages.
For static (non-change-event) objects, requests sent with qualifiers 00, 01, 06, 07, or 08, will be
responded with qualifiers 00 or 01. Static object requests sent with qualifiers 17 or 28 will be responded
with qualifiers 17 or 28. For change-event objects, qualifiers 17 or 28 are always responded.
In the table below text shaded as Subset Level 3 indicates Subset Level 3 functionality
(beyond Subset Level 2), and text shaded as beyond Subset Level 3 indicates functionality
beyond Subset Level 3.

REQUEST RESPONSE
OBJECT
(Library will parse) (Library will respond with)
Object Variation Function Qualifier Codes Function Qualifier Codes
Description
Number Number Codes (dec) (hex) Codes (dec) (hex)
1 0 Binary Input (Variation 0 is used to 1 (read) 00, 01(start-stop)
request default variation) 06(no range, or all)
07, 08(limited qty)
17, 28 (index)
1 1 Binary Input 1 (read) 00, 01(start-stop) 129 (response) 00, 01(start-stop)
06(no range, or all) 17, 28 (index –
07, 08(limited qty) see note 2)
17, 28 (index)
20 0 Binary Counter (Variation 0 is used to 1 (read) 00, 01(start-stop)
request default variation) 06(no range, or all)
07, 08(limited qty)
17, 28 (index)
20 5 32-Bit Binary Counter without Flag 1 (read) 00, 01(start-stop) 129 (response) 00, 01(start-stop)
06(no range, or all) 17, 28 (index –
07, 08(limited qty) see note 2)
17, 28 (index)
21 0 Frozen Counter (Variation 0 is used to 1 (read) 00, 01(start-stop)
request default variation) 06(no range, or all)
07, 08(limited qty)
17, 28 (index)
21 9 32-Bit Frozen Counter without Flag 1 (read) 00, 01(start-stop) 129 (response) 00, 01(start-stop)
06(no range, or all) 17, 28 (index –
07, 08(limited qty) see note 2)
17, 28 (index)
23 0 Frozen Counter Event (Variation 0 is 1 (read) 06(no range, or all)
used to request default variation) 07, 08(limited qty)
23 5 32-Bit Frozen Counter Event with Time 1 (read) 06(no range, or all) 129 (response) 17, 28 (index)
07, 08(limited qty)
30 0 Analog Input (Variation 0 is used to (read) 00, 01(start-stop)
request default variation) 06(no range, or all)
07, 08(limited qty)
17, 28 (index)

D-4
 Appendix D - DNP Serial Communications

REQUEST RESPONSE
OBJECT
(Library will parse) (Library will respond with)
Object Variation Function Qualifier Codes Function Qualifier Codes
Description
Number Number Codes (dec) (hex) Codes (dec) (hex)
30 3 32-Bit Analog Input without Flag (read) 00, 01(start-stop) 129 (response) 00, 01(start-stop)
06(no range, or all) 17, 28 (index –
07, 08(limited qty) see note 2)
17, 28 (index)
30 5 short floating point (read) 00, 01(start-stop) 129 (response) 00, 01(start-stop)
06(no range, or all) 17, 28 (index –
07, 08(limited qty) see note 2)
17, 28 (index)
50 0 Time and Date 1 (read) 00, 01(start-stop) 129 (response) 00, 01(start-stop)
06(no range, or all) 17, 28 (index –
07, 08(limited qty) see note 2)
17, 28 (index)
50 1 Time and Date 1 (read) 00, 01(start-stop) 129 (response) 00, 01(start-stop)
2 (write) 06(no range, or all) 17, 28 (index –
07 (limited qty=1) see note 2)
08 (limited qty)
17, 28 (index)
52 2 Time Delay Fine 129 (response) 07 (limited qty)
(qty = 1)
60 0 Class 0, 1, 2, and 3 Data 1 (read) 06(no range, or all)

60 1 Class 0 Data 1 (read) 06(no range, or all)

60 2 Class 1 Data 1 (read) 06(no range, or all)

07, 08(limited qty)
60 3 Class 2 Data 1 (read) 06(no range, or all)
07, 08(limited qty)
60 4 Class 3 Data 1 (read) 06(no range, or all)
07, 08(limited qty)
80 1 Internal Indications 2 (write) 00 (start-stop)
(index must =7)
No Object (function code only) –See Note 3 13(cold restart)
No Object (function code only) 14(warm restart)
No Object (function code only) 23(delay meas.)

Note 1: For static (non-change-event) objects, qualifiers 17 or 28 are only responded when a request is
sent with qualifiers 17 or 28, respectively. Otherwise, static object requests sent with qualifiers
00, 01, 06, 07, or 08, will be responded with qualifiers 00 or 01. (For change-event objects,
qualifiers 17 or 28 are always responded.)
Note 2: A cold restart is implemented as a warm restart – the JEMStar meter is not restarted, but the
DNP process is restarted.

Point List
The tables in the following sections identify all the individual data points provided by the
implementation of DNP 3.0 in the JEMStar meter.

Binary Input Points

The Binary input points represent such things as:
• Contact input status
• Threshold alarm conditions
• Site monitor alarm conditions
• Phase potential status

JEMStar may be configured with up to 40 Binary Input Points in DNP. You may assign any of the
following Binary Inputs to any Binary Input Point:

D-5
JEMStar User Manual

• Contact Input 1 status • Phase B over voltage alarm

• Contact Input 2 status • Phase A under current alarm
• Voltages out of sequence alarm • Phase A over current alarm
• Neutral over current alarm • Phase A power reversed alarm
• Neutral current swell alarm • Phase A PF high alarm
• Phase C under current alarm • Phase A PF low alarm
• Phase C over current alarm • Phase A voltage sag alarm
• Phase C power reversed alarm • Phase A under voltage alarm
• Phase C PF high alarm • Phase A voltage swell alarm
• Phase C PF low alarm • Phase A over voltage alarm
• Phase C voltage sag alarm • Threshold Alarm 1
• Phase C under voltage alarm • Threshold alarm 2
• Phase C voltage swell alarm • Threshold alarm 3
• Phase C over voltage alarm • Threshold alarm 4
• Phase B under current alarm • Phase A potential status
• Phase B over current alarm • Phase B potential status
• Phase B power reversed alarm • Phase C potential status
• Phase B PF high alarm • Loss of Phase Potential
• Phase B PF low alarm • End of Demand Interval
• Phase B voltage sag alarm • Fatal Error
• Phase B under voltage alarm • Non-fatal Error
• Phase B voltage swell alarm

JEMStar's default configuration is to have these Binary Input Points assigned:

Point Binary Input

Index Name/Description

0 Contact Input 1 status

1 Contact Input 2 status
2 Voltages out of sequence alarm
3 Neutral over current alarm
4 Neutral current swell alarm
5 Phase C under current alarm
6 Phase C over current alarm
7 Phase C power reversed alarm
8 Phase C PF high alarm
9 Phase C PF low alarm
10 Phase C voltage sag alarm
11 Phase C under voltage alarm
12 Phase C voltage swell alarm
13 Phase C over voltage alarm
14 Phase B under current alarm
15 Phase B over current alarm
16 Phase B power reversed alarm
17 Phase B PF high alarm
18 Phase B PF low alarm
19 Phase B voltage sag alarm
20 Phase B under voltage alarm
21 Phase B voltage swell alarm
22 Phase B over voltage alarm
23 Phase A under current alarm
24 Phase A over current alarm
25 Phase A power reversed alarm

D-6
 Appendix D - DNP Serial Communications

Point Binary Input

Index Name/Description

26 Phase A PF high alarm

27 Phase A PF low alarm
28 Phase A voltage sag alarm
29 Phase A under voltage alarm
30 Phase A voltage swell alarm
31 Phase A over voltage alarm
32 Threshold Alarm 1
33 Threshold alarm 2
34 Threshold alarm 3
35 Threshold alarm 4
36 Phase A potential status
37 Phase B potential status
38 Phase C potential status

D-7
JEMStar User Manual

Counters
Counters are implemented as 32-bit counter without flag (Object 20 Var 5). For the counter point list,
the user may select any Normal, Alternate, or Internal (not Test) display register to map to each point in
the counter list. Note that display registers may contain demand or instantaneous readings as well as
consumption totals. This list can be configured to contain up to 64 counter points. In addition to the
Normal and Alternate register set, JEMStar has an internal register list consisting of 49 various
measurements. Using JEMWare, the counter point list can be configured to be any mix of Normal,
Alternate or Internal registers (up to a total of 64 points). Each numeric counter point value is
represented as the corresponding register value times a user-selected scaling factor.

Registers in the Normal and Alternate display lists are set by the user. The Internal list contains these
registers:

• Watthours Delivered • Peak Demand VA Delivered

• Watthours Received • Peak Demand Amp Phase A
• VARhours Delivered • Peak Demand Amp Phase B
• VARhours Received • Peak Demand Amp Phase C
• VAhours Delivered • Peak Demand Neutral Amp
• VAhours Received • Peak Demand Watt Delivered at last BPR
• Qhours Delivered • Peak Demand VAR Delivered at last BPR
• Qhours Received • Peak Demand VA Delivered at last BPR
• Amphours • Time of Peak Demand Watt Delivered
• Volt Squared hours • Time of Peak Demand VAR Delivered
• Amp Squared hours • Time of Peak Demand VA Delivered
• Average PF Delivered Phase A • Time of Peak Demand Amp Phase A
• Average PF Delivered Phase B • Time of Peak Demand Amp Phase B
• Average PF Delivered Phase C • Time of Peak Demand Amp Phase C
• Average PF Delivered Polyphase • Time of Peak Demand Neutral Amp
• Average PF Received Phase A • Time of Peak Watt Delivered at last BPR
• Watt Delivered Past Interval Demand • Time of Peak VAR Delivered at last BPR
• VAR Delivered Past Interval Demand • Time of Peak VA Delivered at last BPR
• VA Delivered Past Interval Demand • PF at Peak Watt Delivered at last BPR
• Amp Phase A Past Interval Demand • PF at Peak VAR Delivered at last BPR
• Amp Phase B Past Interval Demand • PF at Peak VA Delivered at last BPR
• Amp Phase C Past Interval Demand • Watt Delivered Predicted Demand
• Neutral Amp Past Interval Demand • VAR Delivered Predicted Demand
• Peak Demand Watt Delivered • VA Delivered Predicted Demand
• Peak Demand VAR Delivered

D-8
Other data formats that may be assigned to display registers include:
• Time and Date registers are represented as seconds since midnight 1/1/70
• Diagnostic and String register types will be represented as 0
• Status registers will be represented as a direct 32-bit mask value.

The corresponding frozen counter object is implemented as Object 21 Variation 9. The values of the
points in this object represent the values of the corresponding counter points at the time of the last
register freeze.

In JEMStar, all static data is permanently assigned to Class 0.

A JEMStar register configured as a DNP Counter point may contain a value as large as 999,999,999
(nine digits). Some DNP master devices cannot accept counter values this large. You may configure
JEMStar to restrict the reported value of counter points to 3, 4, 5, 6, 7, or 8 digits, or allow the full 9-digit
precision to be reported. Restricting the number of digits reported affects only DNP counter points, not
the actual display registers.

JEMStar's default configuration is to have these Counter Points assigned:

Counter
Point Index
Name/Description

0 Internal – system Watthrs delivered x selected scale

1 Internal – system Watthrs received x selected scale
2 Internal – system VARhrs delivered x selected scale
3 Internal – system VARhrs received x selected scale
4 Internal – system VAhours delivered x selected scale
5 Internal – system VAhours received x selected scale
6 Internal – system Qhrs delivered x selected scale
7 Internal – system Qhrs received x selected scale
8 Internal – system Amphrs x selected scale
9 Internal – system V2h x selected scale
10 Internal – system A2H x selected scale

D-9
JEMStar User Manual

Analog Inputs
Analog Inputs are implemented as 32-bit analog input without flag (object 30 Var 5) points, or 16-bit
analog input without flag (object 30 Var 4) points. A total of up to 140 points are supported, which
represent such things as:
• Instantaneous Per phase Watts, VARs, VA, Volts, Amps, and Power Factor
• Line frequency
• Per-phase THD for volts and Amps
• Per-phase V2 and A2
• Bi-directional Watts and VARs

32-Bit Inputs
These inputs are represented in SECONDARY units, and up to 3 decimal places of precision may be
obtained by entering a scale value of 1000. For conversion to primary units, the point value should be
multiplied by the appropriate PT and/or CT ratio.

JEMStar's default configuration is to have these Analog Input Points assigned:

Point Analog Input Scaling

Index Name/Description

0 Instantaneous Watts, Phase A, Del x1000

1 Instantaneous Watts, Phase A, Rec x1000
2 Instantaneous Watts, Phase B, Del x1000
3 Instantaneous Watts, Phase B, Rec x1000
4 Instantaneous Watts, Phase C, Del x1000
5 Instantaneous Watts, Phase C, Rec x1000
6 Instantaneous Watts, Poly, Del x1000
7 Instantaneous Watts, Poly, Rec x1000
8 Instantaneous VARs, Phase A, Del x1000
9 Instantaneous VARs, Phase A, Rec x1000
10 Instantaneous VARs, Phase B, Del x1000
11 Instantaneous VARs, Phase B, Rec x1000
12 Instantaneous VARs, Phase C, Del x1000
13 Instantaneous VARs, Phase C, Rec x1000
14 Instantaneous VARs, Poly, Del x1000
15 Instantaneous VARs, Poly, Rec x1000
16 Instantaneous VA, Phase A, Del x1000
17 Instantaneous VA, Phase A, Rec x1000
18 Instantaneous VA, Phase B, Del x1000
19 Instantaneous VA, Phase B, Rec x1000
20 Instantaneous VA, Phase C, Del x1000
21 Instantaneous VA, Phase C, Rec x1000
22 Instantaneous VA, Poly, Del x1000
23 Instantaneous VA, Poly, Rec x1000
24 Instantaneous Amps, Phase A x1000
25 Instantaneous Amps, Phase B x1000
26 Instantaneous Amps, Phase C x1000
27 Instantaneous Amps, Neutral x1000
28 Instantaneous Volts, Phase A x1000

D-10
 Appendix D - DNP Serial Communications

Point Analog Input Scaling

Index Name/Description

29 Instantaneous Volts, Phase B x1000

30 Instantaneous Volts, Phase C x1000
31 Frequency x1000
32 Instantaneous PF, Phase A, Del x1000
33 Instantaneous PF, Phase A, Rec x1000
34 Instantaneous PF, Phase B, Del x1000
35 Instantaneous PF, Phase B, Rec x1000
36 Instantaneous PF, Phase C, Del x1000
37 Instantaneous PF, Phase C, Rec x1000
38 Instantaneous PF, Poly, Del x1000
39 Instantaneous PF, Poly, Rec x1000
40 Volts THD, Phase A x1000
41 Volts THD, Phase B x1000
42 Volts THD, Phase C x1000
43 Amps THD, Phase A x1000
44 Amps THD, Phase B x1000
45 Amps THD, Phase C x1000
2
46 Volts Phase A x1000
2
47 Volts Phase B x1000
2
48 Volts Phase C x1000
2
49 Amps Phase A x1000
2
50 Amps Phase B x1000
2
51 Amps Phase C x1000
2
52 Amps Poly x1000
53 Instantaneous Watts, Phase A, x1000
Bidirectional
54 Instantaneous Watts, Phase B, x1000
Bidirectional
55 Instantaneous Watts, Phase C, x1000
Bidirectional
56 Instantaneous Watts, Polyphase, x1000
Bidirectional
57 Instantaneous VARs, Phase A, x1000
Bidirectional
58 Instantaneous VARs, Phase B, x1000
Bidirectional
59 Instantaneous VARs, Phase C, x1000
Bidirectional
60 Instantaneous VARs, Polyphase, x1000
Bidirectional
61 Instantaneous Uncompensated x1000
Watts, Phase A, Del
62 Instantaneous Uncompensated x1000
Watts, Phase A, Rec
63 Instantaneous Uncompensated x1000
Watts, Phase B, Del
64 Instantaneous Uncompensated x1000
Watts, Phase B, Rec
65 Instantaneous Uncompensated x1000
Watts, Phase C, Del
66 Instantaneous Uncompensated x1000
Watts, Phase C, Rec
67 Instantaneous Uncompensated x1000
Watts, Poly, Del
68 Instantaneous Uncompensated x1000
Watts, Poly, Rec
69 Instantaneous Uncompensated x1000
VARs, Phase A, Del

D-11
JEMStar User Manual

Point Analog Input Scaling

Index Name/Description

70 Instantaneous Uncompensated x1000

VARs, Phase A, Rec
71 Instantaneous Uncompensated x1000
VARs, Phase B, Del
72 Instantaneous Uncompensated x1000
VARs, Phase B, Rec
73 Instantaneous Uncompensated x1000
VARs, Phase C, Del
74 Instantaneous Uncompensated x1000
VARs, Phase C, Rec
75 Instantaneous Uncompensated x1000
VARs, Poly, Del
76 Instantaneous Uncompensated x1000
VARs, Poly, Rec
77 Instantaneous Uncompensated VA, x1000
Phase A, Del
78 Instantaneous Uncompensated VA, x1000
Phase A, Rec
79 Instantaneous Uncompensated VA, x1000
Phase B, Del
80 Instantaneous Uncompensated VA, x1000
Phase B, Rec
81 Instantaneous Uncompensated VA, x1000
Phase C, Del
82 Instantaneous Uncompensated VA, x1000
Phase C, Rec
83 Instantaneous Uncompensated VA, x1000
Poly, Del
84 Instantaneous Uncompensated VA, x1000
Poly, Rec
85 Instantaneous Uncompensated PF, x1000
Phase A, Del
86 Instantaneous Uncompensated PF, x1000
Phase A, Rec
87 Instantaneous Uncompensated PF, x1000
Phase B, Del
88 Instantaneous Uncompensated PF, x1000
Phase B, Rec
89 Instantaneous Uncompensated PF, x1000
Phase C, Del
90 Instantaneous Uncompensated PF, x1000
Phase C, Rec
91 Instantaneous Uncompensated PF, x1000
Poly, Del
92 Instantaneous Uncompensated PF, x1000
Poly, Rec
93 Instantaneous Uncompensated x1000
Watts, Phase A, Bidirectional
94 Instantaneous Uncompensated x1000
Watts, Phase B, Bidirectional
95 Instantaneous Uncompensated x1000
Watts, Phase C, Bidirectional
96 Instantaneous Uncompensated x1000
Watts, Polyphase, Bidirectional
97 Instantaneous Uncompensated x1000
VARs, Phase A, Bidirectional
98 Instantaneous Uncompensated x1000
VARs, Phase B, Bidirectional
99 Instantaneous Uncompensated x1000
VARs, Phase C, Bidirectional
100 Instantaneous Uncompensated x1000
VARs, Polyphase, Bidirectional

D-12
 Appendix D - DNP Serial Communications

16-Bit Inputs
These inputs are represented in SECONDARY units and scaled so that the meter’s full-scale value is
represented by 32767. The list is the same as that configured for the 32-bit Analog Input points, but the
user-entered scale values are not used.

Example:
At 60 Hz, the raw value represented for frequency may be 19640. Dividing by 32767 and then
multiplying by the full-scale engineering units value (see the following table), gives the following
reading:
19640
× 100.0 = 59.94 Hz
32767

To obtain primary units, multiply by the appropriate PT and/or CT ratios.

JEMStar's default configuration is to have these Binary Input Points assigned:

Point Analog Input Engineering Units
Scaled Range
Index Name/Description Range

0 Instantaneous Watts, Phase A, Del 0 – 10600 W 0 - 32767

1 Instantaneous Watts, Phase A, Rec 0 – 10600 W 0 - 32767
2 Instantaneous Watts, Phase B, Del 0 – 10600 W 0 - 32767
3 Instantaneous Watts, Phase B, Rec 0 – 10600 W 0 - 32767
4 Instantaneous Watts, Phase C, Del 0 – 10600 W 0 - 32767
5 Instantaneous Watts, Phase C, Rec 0 – 10600 W 0 - 32767
6 Instantaneous Watts, Poly, Del 0 – 31800 W 0 - 32767
7 Instantaneous Watts, Poly, Rec 0 – 31800 W 0 - 32767
8 Instantaneous VARs, Phase A, Del 0 – 10600 VAR 0 - 32767
9 Instantaneous VARs, Phase A, Rec 0 – 10600 VAR 0 - 32767
10 Instantaneous VARs, Phase B, Del 0 – 10600 VAR 0 - 32767
11 Instantaneous VARs, Phase B, Rec 0 – 10600 VAR 0 - 32767
12 Instantaneous VARs, Phase C, Del 0 – 10600 VAR 0 - 32767
13 Instantaneous VARs, Phase C, Rec 0 – 10600 VAR 0 - 32767
14 Instantaneous VARs, Poly, Del 0 – 31800 VAR 0 - 32767
15 Instantaneous VARs, Poly, Rec 0 – 31800 VAR 0 - 32767
16 Instantaneous VA, Phase A, Del 0 – 10600 VA 0 - 32767
17 Instantaneous VA, Phase A, Rec 0 – 10600 VA 0 - 32767
18 Instantaneous VA, Phase B, Del 0 – 10600 VA 0 - 32767
19 Instantaneous VA, Phase B, Rec 0 – 10600 VA 0 - 32767
20 Instantaneous VA, Phase C, Del 0 – 10600 VA 0 - 32767
21 Instantaneous VA, Phase C, Rec 0 – 10600 VA 0 - 32767
22 Instantaneous VA, Poly, Del 0 – 31800 VA 0 - 32767
23 Instantaneous VA, Poly, Rec 0 – 31800 VA 0 - 32767
24 Instantaneous Amps, Phase A 0 –20 A 0 - 32767
25 Instantaneous Amps, Phase B 0 –20 A 0 - 32767
26 Instantaneous Amps, Phase C 0 –20 A 0 - 32767
27 Instantaneous Amps, Neutral 0 –20 A 0 - 32767
28 Instantaneous Volts, Phase A 0 – 530 V 0 - 32767
29 Instantaneous Volts, Phase B 0 – 530 V 0 - 32767
30 Instantaneous Volts, Phase C 0 – 530 V 0 - 32767
31 Frequency 0 – 100 Hz 0 - 32767
32 Instantaneous PF, Phase A, Del 0 – 1.00 0 - 32767

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JEMStar User Manual

Point Analog Input Engineering Units

Scaled Range
Index Name/Description Range

33 Instantaneous PF, Phase A, Rec 0 – 1.00 0 - 32767

34 Instantaneous PF, Phase B, Del 0 – 1.00 0 - 32767
35 Instantaneous PF, Phase B, Rec 0 – 1.00 0 - 32767
36 Instantaneous PF, Phase C, Del 0 – 1.00 0 - 32767
37 Instantaneous PF, Phase C, Rec 0 – 1.00 0 - 32767
38 Instantaneous PF, Poly, Del 0 – 1.00 0 - 32767
39 Instantaneous PF, Poly, Rec 0 – 1.00 0 - 32767
40 Volts THD, Phase A 0 – 100 % 0 - 32767
41 Volts THD, Phase B 0 – 100 % 0 - 32767
42 Volts THD, Phase C 0 – 100 % 0 - 32767
43 Amps THD, Phase A 0 – 100 % 0 - 32767
44 Amps THD, Phase B 0 – 100 % 0 - 32767
45 Amps THD, Phase C 0 – 100 % 0 - 32767
2 2
46 Volts Phase A 0 – 280900 V 0 - 32767
2 2
47 Volts Phase B 0 – 280900 V 0 - 32767
2 2
48 Volts Phase C 0 – 280900 V 0 - 32767
2 2
49 Amps Phase A 0 – 400 A 0 - 32767
2 2
50 Amps Phase B 0 – 400 A 0 - 32767
2 2
51 Amps Phase C 0 – 400 A 0 - 32767
2 2
52 Amps Poly 0 – 1200 A 0 - 32767
Instantaneous Watts, Phase A,
53 -10600 to +10600 W -32768 to +32767
Bidirectional
Instantaneous Watts, Phase B,
54 -10600 to +10600 W -32768 to +32767
Bidirectional
Instantaneous Watts, Phase C,
55 -10600 to +10600 W -32768 to +32767
Bidirectional
Instantaneous Watts, Polyphase,
56 -31800 to +31800 W -32768 to +32767
Bidirectional
Instantaneous VARs, Phase A,
57 -10600 to +10600 VAR -32768 to +32767
Bidirectional
Instantaneous VARs, Phase B,
58 -10600 to +10600 VAR -32768 to +32767
Bidirectional
Instantaneous VARs, Phase C,
59 -10600 to +10600 VAR -32768 to +32767
Bidirectional
Instantaneous VARs, Polyphase,
60 -31800 to +31800 VAR -32768 to +32767
Bidirectional
Instantaneous Uncompensated
61 0 – 10600 W 0 - 32767
Watts, Phase A, Del
Instantaneous Uncompensated
62 0 – 10600 W 0 - 32767
Watts, Phase A, Rec
Instantaneous Uncompensated
63 0 – 10600 W 0 - 32767
Watts, Phase B, Del
Instantaneous Uncompensated
64 0 – 10600 W 0 - 32767
Watts, Phase B, Rec
Instantaneous Uncompensated
65 0 – 10600 W 0 - 32767
Watts, Phase C, Del
Instantaneous Uncompensated
66 0 – 10600 W 0 - 32767
Watts, Phase C, Rec
Instantaneous Uncompensated
67 0 – 31800 W 0 - 32767
Watts, Poly, Del
Instantaneous Uncompensated
68 0 – 31800 W 0 - 32767
Watts, Poly, Rec
Instantaneous Uncompensated
69 0 – 10600 VAR 0 - 32767
VARs, Phase A, Del
Instantaneous Uncompensated
70 0 – 10600 VAR 0 - 32767
VARs, Phase A, Rec
Instantaneous Uncompensated
71 0 – 10600 VAR 0 - 32767
VARs, Phase B, Del
Instantaneous Uncompensated
72 0 – 10600 VAR 0 - 32767
VARs, Phase B, Rec

D-14
 Appendix D - DNP Serial Communications

Point Analog Input Engineering Units

Scaled Range
Index Name/Description Range

Instantaneous Uncompensated
73 0 – 10600 VAR 0 - 32767
VARs, Phase C, Del
Instantaneous Uncompensated
74 0 – 10600 VAR 0 - 32767
VARs, Phase C, Rec
Instantaneous Uncompensated
75 0 – 31800 VAR 0 - 32767
VARs, Poly, Del
Instantaneous Uncompensated
76 0 – 31800 VAR 0 - 32767
VARs, Poly, Rec
Instantaneous Uncompensated VA,
77 0 – 10600 VA 0 - 32767
Phase A, Del
Instantaneous Uncompensated VA,
78 0 – 10600 VA 0 - 32767
Phase A, Rec
Instantaneous Uncompensated VA,
79 0 – 10600 VA 0 - 32767
Phase B, Del
Instantaneous Uncompensated VA,
80 0 – 10600 VA 0 - 32767
Phase B, Rec
Instantaneous Uncompensated VA,
81 0 – 10600 VA 0 - 32767
Phase C, Del
Instantaneous Uncompensated VA,
82 0 – 10600 VA 0 - 32767
Phase C, Rec
Instantaneous Uncompensated VA,
83 0 – 31800 VA 0 - 32767
Poly, Del
Instantaneous Uncompensated VA,
84 0 – 31800 VA 0 - 32767
Poly, Rec
Instantaneous Uncompensated PF,
85 0 – 1.00 0 - 32767
Phase A, Del
Instantaneous Uncompensated PF,
86 0 – 1.00 0 - 32767
Phase A, Rec
Instantaneous Uncompensated PF,
87 0 – 1.00 0 - 32767
Phase B, Del
Instantaneous Uncompensated PF,
88 0 – 1.00 0 - 32767
Phase B, Rec
Instantaneous Uncompensated PF,
89 0 – 1.00 0 - 32767
Phase C, Del
Instantaneous Uncompensated PF,
90 0 – 1.00 0 - 32767
Phase C, Rec
Instantaneous Uncompensated PF,
91 0 – 1.00 0 - 32767
Poly, Del
Instantaneous Uncompensated PF,
92 0 – 1.00 0 - 32767
Poly, Rec
Instantaneous Uncompensated
93 -10600 to +10600 W -32768 to +32767
Watts, Phase A, Bidirectional
Instantaneous Uncompensated
94 -10600 to +10600 W -32768 to +32767
Watts, Phase B, Bidirectional
Instantaneous Uncompensated
95 -10600 to +10600 W -32768 to +32767
Watts, Phase C, Bidirectional
Instantaneous Uncompensated
96 -31800 to +31800 W -32768 to +32767
Watts, Polyphase, Bidirectional
Instantaneous Uncompensated
97 -10600 to +10600 VAR -32768 to +32767
VARs, Phase A, Bidirectional
Instantaneous Uncompensated
98 -10600 to +10600 VAR -32768 to +32767
VARs, Phase B, Bidirectional
Instantaneous Uncompensated
99 -10600 to +10600 VAR -32768 to +32767
VARs, Phase C, Bidirectional
Instantaneous Uncompensated
100 -31800 to +31800 VAR -32768 to +32767
VARs, Polyphase, Bidirectional

D-15
JEMStar User Manual

Events
The JEMStar DNP implementation includes frozen counter event objects. These are implemented as
Object 23 Var 5, 32-Bit frozen counter with time. These provide a time-stamped snapshot of the
corresponding counters at the time of freeze. The JEMStar has storage for 5 frozen event objects when
all 64 points are configured (possibly more if less points are used). An event is generated at each register
freeze. Each event includes all corresponding registers at the time the freeze occurred.

If event data is not desired, the generation of events can be disabled using JEMWare.

In JEMStar, all event data is permanently assigned to Class 1.

Time and Date

Time and Date (object 50) is supported both for read and write. Using JEMWare, you can configure the
"Write Time Interval", which is the interval after which the JEMStar will set the "Need Time" bit in the
Internal Indications.

Configuration
JEMWare software must be used to set up the configurable parameters that relate to DNP 3.0 in the
JEMStar, as well as configurable point assignments for Object 20. Please refer to the section in this
manual titled “Protocols” for detailed procedures.

D-16
 APPENDIX E
MODBUS COMMUNICATIONS
MODBUS INTRODUCTION
The MODBUS protocol defines a message structure that electronic communications equipment will
recognize and use, regardless of the type of networks over which they communicate. It describes the
procedure a host piece of equipment called the MASTER uses to request access to another device called
the SLAVE, how it will respond to requests from other devices, and how errors will be detected and
reported. A common format is defined for the layout and contents of message fields.

The MODBUS protocol has two distinct forms, RTU mode and ASCII mode. RTU mode essentially
means binary mode, where each byte of information is transmitted as an actual 8-bit binary byte. ASCII
mode packages each byte in two ASCII coded hexadecimal characters. In addition, the two modes use
different methods to calculate their checksums and message packet boundaries. These methods are
detailed later in this section.

Further information concerning MODBUS implementation standards can be found at the following
website:

www.modicon.com/techpubs/toc7.html

The MODBUS Device Address, timeout, and communications parameters are configured via the
JEMWare software. JEMStar will always be a MODBUS slave device.

E-1
JEMStar User Manual

Communications
The following MODBUS communications parameters are configurable via JEMWare:
• ASCII or RTU mode
• Baud Rate (1200,9600,19200,38400)
• RS-232 (full duplex) or RS-485 (half duplex) signal levels

Note: MODBUS communications are always 8-bit, no parity.

Serial Port Connections

MODBUS Point-to-Point Connection Using RS232

This method is used for connecting the JEMStar MODBUS directly to a MODBUS Master device. The
transmit and receive data pins on the MODBUS host system may vary between pin 2 and pin 3 according
to the type of equipment used. In applications where an IBM compatible PC with a 9-pin D-Type
connector is used, TXD is pin 3 and RXD is pin 2.

MODBUS Master Direction JEMStar I/O cable

DTE RXD or DCE TXD BLUE/GREEN
DTE TXD or DCE RXD BLUE/RED
Comm GND ⎯ PURPLE/WHITE

MODBUS Multidrop Connection Using RS485 (differential)

MODBUS Master Direction JEMStar I/O cable
XMT/RCV - BLUE/RED
XMT/RCV+ BLUE/GREEN

Notes:
• JEMStar does not implement hardware handshaking signals with RS-232 or RS-485 serial data.
• The MODBUS port is connected via a pigtail I/O cable for S-base and A-Base meters (wire
colors shown above). See the section labeled “Serial Communications” for wiring details of
Switchboard meters (terminal block connections). Refer to the section “Dual Communications
Option” for connections if your meter has this feature.

Data Transfers using MODBUS (RTU or ASCII)

The JEMStar MODBUS implementation will fully support all data transfers with the following
commands:

Read Output Status (Function code 01)

Read Input Status (Function code 02)
Read Holding Registers (Function code 03)
Read Input Registers (Function code 04)
Force Single Coil (Function code 05)
Force Multiple Coils (Function code 15)
Preset Multiple Registers (Function code 16)

E-2
 Appendix E - MODBUS Communications

As implied by the Read Holding Registers command, all JEMStar available data will be stored in 16-bit
Holding Registers. However, these registers will either hold the High Order or Low Order 16 bits (word)
of a 32-bit quantity. Whenever a 32-bit quantity is accessed, the registers containing both the High Order
& Low Order words must be included in the request, or the command will be rejected.

The JEMStar MODBUS interface can access data in either RTU or ASCII mode. The supported Register
Sets and the MODBUS Function Codes (FC) used to retrieve the data are as follows.

Function Code (FC) Register Set

01 Read Discrete Outputs
02 Read Discrete Inputs
03 Read Holding Registers (native data types)
04 Read Input Registers (Scaled and Cascaded)
05 Force Single Discrete Outputs
15 Force Multiple Discrete Outputs
16 Preset Multiple Holding Registers

LRC Calculation (ASCII mode)

When the JEMStar MODBUS interface operates in ASCII mode, it uses LRC for error checking. The
LRC value is one byte, contained in two ASCII characters. The LRC consists of the 2’s complement of
the byte sum of all the binary byte values (after each pair of ASCII coded hex characters are converted to
a byte) of the Device Address through the last Data byte. Neither the Start of Message colon (‘:’) nor the
carriage return – line feed pair is included in the LRC calculation.

The LRC value is calculated by the transmitting device that appends the LRC to the message. The
receiving device recalculates the LRC and compares it to the value in the message. If the values are not
the same, the receiver ignores the message.

CRC Calculation (RTU mode)

The MODBUS interface also operates in RTU mode and uses CRC for error checking. The CRC value
is two bytes, containing a 16 bit binary value. The CRC value is calculated by the transmitting device
that appends the CRC to the message. The receiving device recalculates the CRC and compares it to the
value in the message. If the values are not the same, the receiver will not process the message.
The CRC value is calculated according to the following procedure.
1. Initialize a 16 bit CRC register to 0xFFFF
2. Place the first 8 bit character from the message and place it into a test register.
3. Exclusive OR the test character with the CRC register, leaving the result in the CRC register.
4. The CRC register is shifted one bit toward the least significant bit, the least significant bit is
saved into a carry register, and the most significant bit is zero filled.
5. If the old least significant bit was zero, go to step 6, if it was one, the CRC register is exclusive
ORed with 0xa001.
6. Repeat steps 4 and 5, seven times.
7. Using each successive character in the message, repeat steps 3 through 6.
8. The CRC is the value in the CRC register.
9. The CRC value is placed into the message in hexadecimal format with the most significant byte
going into the first CRC byte and the least significant byte going into the last CRC byte.

E-3
JEMStar User Manual

RTU Message Framing

In RTU mode, messages start with a silence interval of at least 3.5 character times. If the SLAVE device
can monitor the network bus continuously, this silence interval can be used to identify the beginning of a
new message, with the first field of a new message being the Device Address. Devices that use the
silence interval to detect a new message expect the entire message frame to be transmitted continuously,
and do not allow a silent interval of more than 1.5 characters to occur before completion of the entire
message.

The JEMStar MODBUS implementation will not monitor the network bus continuously, and thus will
not detect any silence interval. Consequently, the strict rules about silence intervals will not be enforced.
The start of a new message will be detected using a synchronization algorithm.

Typical JEMStar RTU Queries:

Query Field Read Holding Regs Force Single Coil

Device Address 05 05
Function 03 05
Register Address 00 04 00 01
# Regs/Preset Value 00 06 FF 00
Error Check (CRC) XX XX XX XX

ASCII Message Framing

In ASCII mode, messages start with a ‘colon’ (:) character (ASCII 3A hex) and end with a ‘carriage
return – line feed’ pair (ASCII 0D & 0A hex). The carriage return – line feed pair is optional.

The allowable characters transmitted for all other fields are hexadecimal 0-9 and A-F. SLAVE Devices
monitor the network bus continuously for the colon character. When one is received, each device
decodes the next field (the address field) to determine if the query is directed at it.

Intervals of up to one second can elapse between characters within the message. If a greater interval
occurs, the receiving device assumes that an error has occurred.

Typical JEMStar ASCII Queries:

Query Field Read Holding Regs Force Single Coil

Start character ‘:’ ‘:’
Device Address ‘0’ ‘5’ ‘0’ ‘5’
Function ‘0’ ‘3’ ‘0’ ‘5’
Register Address ‘0’ ‘0’ ‘0’ ‘4’ ‘0’ ‘0’ ‘0’ ‘1’
# Regs/Preset Value ‘0’ ‘0’ ‘0’ ‘6’ ‘F’ ‘F’ ‘0’ ‘0’
Error Check (LRC) ‘X’ ‘X’ ‘X’ ‘X’
End characters CR LF CR LF

Communication Errors
Communication errors, consisting of an illegal character in ASCII mode, a Parity, LRC or CRC error,
will result in the message causing the error to be ignored by the meter. The MASTER Device will
timeout and retransmit the message.
E-4
 Appendix E - MODBUS Communications

Exception Responses
The JEMStar MODBUS implementation can produce 1 of 3 possible exceptions:

• Illegal Function (Exception Code 01)

• Illegal Data Address (Exception Code 02)
• Illegal Data Value (Exception Code 03)

An Illegal Function is self-explanatory. If the meter receives a MODBUS query that contains a function
that it does not support (anything other than 01, 02 03, 04, 05, 15 or 16), an Illegal Function (Exception
01) will be returned.

The Data Address is the Holding Register or Input Register address. For example, an Illegal Data
Address for a Function 03 command would be either a register value greater that 0xE7 or a register value
that begins at the second word (Lo Order Word) of a 32-bit quantity. An Illegal Data Address for a
Function 06 command would be any register other that 0x16.

The meaning of the Data Value depends upon the command. The Data Value for a Function 03
command is the number of Holding registers requested, starting with the first (Data Address) register. If
the sum of the first register and the number of registers is either greater that 0x3F, or results in the
request of only one word of any 32-bit quantity, an Illegal Data Value exception is generated.

An Exception Response is the JEMStar’s Device Address, the function value with the High Order Bit set
to 1, and the Exception Code followed by either the LRC (ASCII mode) or the CRC (RTU mode). For
example, in RTU mode an Illegal Data Address exception to a function 03 request would be:

Exception Byte Contents Example

1 JEMStar Device Address 5
2 Marked Function Code 83
3 Exception Code 02
4 High Order Byte CRC XX
5 Low Order Byte CRC XX

Timeouts

RTU Mode
The timeout period from the reception of a matching Device Address until that message is completed is
software assignable using JEMWare software. If a timeout occurs, the portion of the message already
processed is discarded and the meter will again look for a matching Device Address. The default timeout
is 1 second.

ASCII Mode
In ASCII mode, the timeout is meaningless to the JEMStar since it is always the SLAVE Device.
Whenever a colon (‘:’) character is encountered, the MODBUS logic automatically interprets it as the
start of a new message and discards any portion of the previous message. Similarly, if a timeout were to
occur, any portion of the previous message would be discarded and the logic would wait for the next
colon (‘:’) character, which essentially accomplishes the same purpose.

E-5
JEMStar User Manual

However, since the Carriage Return – Line Feed pair is optional at the end of a query message, a 1
second timer is automatically started at the end of the CRC to allow for these optional characters. If the
Carriage Return – Line Feed pair is not received at the end of this 1 second timeout, the logic proceeds
with processing the message.

Register Presets
In the JEMStar Modbus implementation, meter registers (Normal and Alternate) may be cleared or set to
a given value with the Preset Multiple Registers command (Function Code 15). Note that the start
register specified in the command must be the Hi-order register number of the appropriate register pair.
In addition, ”Allow Register Presets” must be specifically enabled in the meter with JEMWare (Use
menu Meter Settings/Protocols/ Modbus). If not enabled, Modbus exception 01 (illegal function) will be
returned if register presets are attempted.

Digital Output Control

The JEMStar digital outputs may be forced to a high or low state via MODBUS using either the Force
Single coil or Force Multiple Coils command. To use this feature, ”Allow Digital Output Control”
must be enabled in the meter with JEMWare. If not enabled, Modbus exception 01 (illegal function) will
be returned if this is attempted.

MODBUS REGISTER MAPS

JEMStar contains 4 Discrete Output registers, 39 Discrete Input Registers, 232 Holding registers, and 61
Input registers. All Holding Registers contain 32-bit data values in consecutive pairs. Thus, the
individual Holding Registers 40001 through 40232 will contain either the High Order Word or the Low
Order Word of a 32-bit data type.

The Input Registers of the meter are stored as signed and unsigned 16-bit integers. These integers
represent a value in some Engineering Unit, with a 'Scale Factor' of some number of decimal places.

The JEMStar register values are visible via MODBUS as MODBUS Holding Registers. The 32-bit
register values are mapped as two consecutive MODBUS registers, with the High Order 16-bit segment
first. Any or all of these MODBUS Registers can be accessed via the MODBUS Read Holding Registers
(03) command.

The following pages show the MODBUS memory map in table form.

Read Output (Coil) Status (function 01) Point list

MODBUS Address PLC Address Register Contents

REG 00 10001 Digital Output 1
REG 01 10002 Digital Output 2
REG 03 10003 Digital Output 3
REG 04 10004 Digital Output 4

E-6
 Appendix E - MODBUS Communications

Read Input Status (function 02) Point List

MODBUS Address PLC Address Register Contents

REG 00 20001 Contact Input 1 status
REG 01 20002 Contact Input 2 status
REG 02 20003 Voltages out of sequence alarm
REG 03 20004 Neutral over current alarm
REG 04 20005 Neutral current swell alarm
REG 05 20006 Phase C under current alarm
REG 06 20007 Phase C over current alarm
REG 07 20008 Phase C power reversed alarm
REG 08 20009 Phase C PF high alarm
REG 09 20010 Phase C PF low alarm
REG 0A 20011 Phase C voltage sag alarm
REG 0B 20012 Phase C under voltage alarm
REG 0C 20013 Phase C voltage swell alarm
REG 0D 20014 Phase C over voltage alarm
REG 0E 20015 Phase B under current alarm
REG 0F 20016 Phase B over current alarm
REG 10 20017 Phase B power reversed alarm
REG 11 20018 Phase B PF high alarm
REG 12 20019 Phase B PF low alarm
REG 13 20020 Phase B voltage sag alarm
REG 14 20021 Phase B under voltage alarm
REG 15 20022 Phase B voltage swell alarm
REG 16 20023 Phase B over voltage alarm
REG 17 20024 Phase A under current alarm
REG 18 20025 Phase A over current alarm
REG 19 20026 Phase A power reversed alarm
REG 1A 20027 Phase A PF high alarm
REG 1B 20028 Phase A PF low alarm
REG 1C 20029 Phase A voltage sag alarm
REG 1D 20030 Phase A under voltage alarm
REG 1E 20031 Phase A voltage swell alarm
REG 1F 20032 Phase A over voltage alarm
REG 20 20033 Threshold alarm 1
REG 21 20034 Threshold alarm 2
REG 22 20035 Threshold alarm 3
REG 23 20036 Threshold alarm 4
REG 24 20037 Phase A potential status
REG 25 20038 Phase B potential status
REG 26 20039 Phase C potential status

E-7
JEMStar User Manual

Read Holding Registers (function 03) Point List

MODBUS PLC Signed/ Scale Factor Register Contents

Address Address Unsigned
REG 00 40001 S 1000 PT Ratio Hi
REG 01 40002 S 1000 PT Ratio Lo
REG 02 40003 S 1000 CT Ratio Hi
REG 03 40004 S 1000 CT Ratio Lo
REG 04 40005 Reserved
REG 05 40006 Reserved
REG 06 40007 Reserved
REG 07 40008 Reserved
REG 08 40009 Reserved
REG 09 40010 Reserved
REG 0A 40011 S 1000 Normal Reg 0 Hi
REG 0B 40012 S 1000 Normal Reg 0 Lo
REG 0C 40013 S 1000 Normal Reg 1 Hi
REG 0D 40014 S 1000 Normal Reg 1 Lo
REG 0E 40015 S 1000 Normal Reg 2 Hi
REG 0F 40016 S 1000 Normal Reg 2 Lo
REG 10 40017 S 1000 Normal Reg 3 Hi
REG 11 40018 S 1000 Normal Reg 3 Lo
REG 12 40019 S 1000 Normal Reg 4 Hi
REG 13 40020 S 1000 Normal Reg 4 Lo
REG 14 40021 S 1000 Normal Reg 5 Hi
REG 15 40022 S 1000 Normal Reg 5 Lo
REG 16 40023 S 1000 Normal Reg 6 Hi
REG 17 40024 S 1000 Normal Reg 6 Lo
REG 18 40025 S 1000 Normal Reg 7 Hi
REG 19 40026 S 1000 Normal Reg 7 Lo
REG 1A 40027 S 1000 Normal Reg 8 Hi
REG 1B 40028 S 1000 Normal Reg 8 Lo
REG 1C 40029 S 1000 Normal Reg 9 Hi
REG 1D 40030 S 1000 Normal Reg 9 Lo
REG 1E 40031 S 1000 Normal Reg 10 Hi
REG 1F 40032 S 1000 Normal Reg 10 Lo
REG 20 40033 S 1000 Normal Reg 11 Hi
REG 21 40034 S 1000 Normal Reg 11 Lo
REG 22 40035 S 1000 Normal Reg 12 Hi
REG 23 40036 S 1000 Normal Reg 12 Lo
REG 24 40037 S 1000 Normal Reg 13 Hi
REG 25 40038 S 1000 Normal Reg 13 Lo
REG 26 40039 S 1000 Normal Reg 14 Hi
REG 27 40040 S 1000 Normal Reg 14 Lo
REG 28 40041 S 1000 Normal Reg 15 Hi
REG 29 40042 S 1000 Normal Reg 15 Lo
REG 2A 40043 S 1000 Normal Reg 16 Hi
REG 2B 40044 S 1000 Normal Reg 16 Lo
REG 2C 40045 S 1000 Normal Reg 17 Hi
E-8
 Appendix E - MODBUS Communications

MODBUS PLC Signed/ Scale Factor Register Contents

Address Address Unsigned
REG 2D 40046 S 1000 Normal Reg 17 Lo
REG 2E 40047 S 1000 Normal Reg 18 Hi
REG 2F 40048 S 1000 Normal Reg 18 Lo
REG 30 40049 S 1000 Normal Reg 19 Hi
REG 31 40050 S 1000 Normal Reg 19 Lo
REG 32 40051 S 1000 Normal Reg 20 Hi
REG 33 40052 S 1000 Normal Reg 20 Lo
REG 34 40053 S 1000 Normal Reg 21 Hi
REG 35 40054 S 1000 Normal Reg 21 Lo
REG 36 40055 S 1000 Normal Reg 22 Hi
REG 37 40056 S 1000 Normal Reg 22 Lo
REG 38 40057 S 1000 Normal Reg 23 Hi
REG 39 40058 S 1000 Normal Reg 23 Lo
REG 3A 40059 S 1000 Normal Reg 24 Hi
REG 3B 40060 S 1000 Normal Reg 24 Lo
REG 3C 40061 S 1000 Normal Reg 25 Hi
REG 3D 40062 S 1000 Normal Reg 25 Lo
REG 3E 40063 S 1000 Normal Reg 26 Hi
REG 3F 40064 S 1000 Normal Reg 26 Lo
REG 40 40065 S 1000 Normal Reg 27 Hi
REG 41 40066 S 1000 Normal Reg 27 Lo
REG 42 40067 S 1000 Normal Reg 28 Hi
REG 43 40068 S 1000 Normal Reg 28 Lo
REG 44 40069 S 1000 Normal Reg 29 Hi
REG 45 40070 S 1000 Normal Reg 29 Lo
REG 46 40071 S 1000 Normal Reg 30 Hi
REG 47 40072 S 1000 Normal Reg 30 Lo
REG 48 40073 S 1000 Normal Reg 31 Hi
REG 49 40074 S 1000 Normal Reg 31 Lo
REG 4A 40075 S 1000 Normal Reg 32 Hi
REG 4B 40076 S 1000 Normal Reg 32 Lo
REG 4C 40077 S 1000 Normal Reg 33 Hi
REG 4D 40078 S 1000 Normal Reg 33 Lo
REG 4E 40079 S 1000 Normal Reg 34 Hi
REG 4F 40080 S 1000 Normal Reg 34 Lo
REG 50 40081 S 1000 Normal Reg 35 Hi
REG 51 40082 S 1000 Normal Reg 35 Lo
REG 52 40083 S 1000 Normal Reg 36 Hi
REG 53 40084 S 1000 Normal Reg 36 Lo
REG 54 40085 S 1000 Normal Reg 37 Hi
REG 55 40086 S 1000 Normal Reg 37 Lo
REG 56 40087 S 1000 Normal Reg 38 Hi
REG 57 40088 S 1000 Normal Reg 38 Lo
REG 58 40089 S 1000 Normal Reg 39 Hi
REG 59 40090 S 1000 Normal Reg 39 Lo
REG 5A 40091 S 1000 Normal Reg 40 Hi
REG 5B 40092 S 1000 Normal Reg 40 Lo
E-9
JEMStar User Manual

MODBUS PLC Signed/ Scale Factor Register Contents

Address Address Unsigned
REG 5C 40093 S 1000 Normal Reg 41 Hi
REG 5D 40094 S 1000 Normal Reg 41 Lo
REG 5E 40095 S 1000 Normal Reg 42 Hi
REG 5F 40096 S 1000 Normal Reg 42 Lo
REG 60 40097 S 1000 Normal Reg 43 Hi
REG 61 40098 S 1000 Normal Reg 43 Lo
REG 62 40099 S 1000 Normal Reg 44 Hi
REG 63 40100 S 1000 Normal Reg 44 Lo
REG 64 40101 S 1000 Normal Reg 45 Hi
REG 65 40102 S 1000 Normal Reg 45 Lo
REG 66 40103 S 1000 Normal Reg 46 Hi
REG 67 40104 S 1000 Normal Reg 46 Lo
REG 68 40105 S 1000 Normal Reg 47 Hi
REG 69 40106 S 1000 Normal Reg 47 Lo
REG 6A 40107 S 1000 Normal Reg 48 Hi
REG 6B 40108 S 1000 Normal Reg 48 Lo
REG 6C 40109 S 1000 Normal Reg 49 Hi
REG 6D 40110 S 1000 Normal Reg 49 Lo
REG 6E 40111 S 1000 Alternate Reg 0 Hi
REG 6F 40112 S 1000 Alternate Reg 0 Lo
REG 70 40113 S 1000 Alternate Reg 1 Hi
REG 71 40114 S 1000 Alternate Reg 1 Lo
REG 72 40115 S 1000 Alternate Reg 2 Hi
REG 73 40116 S 1000 Alternate Reg 2 Lo
REG 74 40117 S 1000 Alternate Reg 3 Hi
REG 75 40118 S 1000 Alternate Reg 3 Lo
REG 76 40119 S 1000 Alternate Reg 4 Hi
REG 77 40120 S 1000 Alternate Reg 4 Lo
REG 78 40121 S 1000 Alternate Reg 5 Hi
REG 79 40122 S 1000 Alternate Reg 5 Lo
REG 7A 40123 S 1000 Alternate Reg 6 Hi
REG 7B 40124 S 1000 Alternate Reg 6 Lo
REG 7C 40125 S 1000 Alternate Reg 7 Hi
REG 7D 40126 S 1000 Alternate Reg 7 Lo
REG 7E 40127 S 1000 Alternate Reg 8 Hi
REG 7F 40128 S 1000 Alternate Reg 8 Lo
REG 80 40129 S 1000 Alternate Reg 9 Hi
REG 81 40130 S 1000 Alternate Reg 9 Lo
REG 82 40131 S 1000 Alternate Reg 10 Hi
REG 83 40132 S 1000 Alternate Reg 10 Lo
REG 84 40133 S 1000 Alternate Reg 11 Hi
REG 85 40134 S 1000 Alternate Reg 11 Lo
REG 86 40135 S 1000 Alternate Reg 12 Hi
REG 87 40136 S 1000 Alternate Reg 12 Lo
REG 88 40137 S 1000 Alternate Reg 13 Hi
REG 89 40138 S 1000 Alternate Reg 13 Lo
REG 8A 40139 S 1000 Alternate Reg 14 Hi
E-10
 Appendix E - MODBUS Communications

MODBUS PLC Signed/ Scale Factor Register Contents

Address Address Unsigned
REG 8B 40140 S 1000 Alternate Reg 14 Lo
REG 8C 40141 S 1000 Alternate Reg 15 Hi
REG 8D 40142 S 1000 Alternate Reg 15 Lo
REG 8E 40143 S 1000 Alternate Reg 16 Hi
REG 8F 40144 S 1000 Alternate Reg 16 Lo
REG 90 40145 S 1000 Alternate Reg 17 Hi
REG 91 40146 S 1000 Alternate Reg 17 Lo
REG 92 40147 S 1000 Alternate Reg 18 Hi
REG 93 40148 S 1000 Alternate Reg 18 Lo
REG 94 40149 S 1000 Alternate Reg 19 Hi
REG 95 40150 S 1000 Alternate Reg 19 Lo
REG 96 40151 S 1000 Alternate Reg 20 Hi
REG 97 40152 S 1000 Alternate Reg 20 Lo
REG 98 40153 S 1000 Alternate Reg 21 Hi
REG 99 40154 S 1000 Alternate Reg 21 Lo
REG 9A 40155 S 1000 Alternate Reg 22 Hi
REG 9B 40156 S 1000 Alternate Reg 22 Lo
REG 9C 40157 S 1000 Alternate Reg 23 Hi
REG 9D 40158 S 1000 Alternate Reg 23 Lo
REG 9E 40159 S 1000 Alternate Reg 24 Hi
REG 9F 40160 S 1000 Alternate Reg 24 Lo
REG A0 40161 S 1000 Alternate Reg 25 Hi
REG A1 40162 S 1000 Alternate Reg 25 Lo
REG A2 40163 S 1000 Alternate Reg 26 Hi
REG A3 40164 S 1000 Alternate Reg 26 Lo
REG A4 40165 S 1000 Alternate Reg 27 Hi
REG A5 40166 S 1000 Alternate Reg 27 Lo
REG A6 40167 S 1000 Alternate Reg 28 Hi
REG A7 40168 S 1000 Alternate Reg 28 Lo
REG A8 40169 S 1000 Alternate Reg 29 Hi
REG A9 40170 S 1000 Alternate Reg 29 Lo
REG AA 40171 S 1000 Alternate Reg 30 Hi
REG AB 40172 S 1000 Alternate Reg 30 Lo
REG AC 40173 S 1000 Alternate Reg 31 Hi
REG AD 40174 S 1000 Alternate Reg 31 Lo
REG AE 40175 S 1000 Alternate Reg 32 Hi
REG AF 40176 S 1000 Alternate Reg 32 Lo
REG B0 40177 S 1000 Alternate Reg 33 Hi
REG B1 40178 S 1000 Alternate Reg 33 Lo
REG B2 40179 S 1000 Alternate Reg 34 Hi
REG B3 40180 S 1000 Alternate Reg 34 Lo
REG B4 40181 S 1000 Alternate Reg 35 Hi
REG B5 40182 S 1000 Alternate Reg 35 Lo
REG B6 40183 S 1000 Alternate Reg 36 Hi
REG B7 40184 S 1000 Alternate Reg 36 Lo
REG B8 40185 S 1000 Alternate Reg 37 Hi
REG B9 40186 S 1000 Alternate Reg 37 Lo
E-11
JEMStar User Manual

MODBUS PLC Signed/ Scale Factor Register Contents

Address Address Unsigned
REG BA 40187 S 1000 Alternate Reg 38 Hi
REG BB 40188 S 1000 Alternate Reg 38 Lo
REG BC 40189 S 1000 Alternate Reg 39 Hi
REG BD 40190 S 1000 Alternate Reg 39 Lo
REG BE 40191 S 1000 Alternate Reg 40 Hi
REG BF 40192 S 1000 Alternate Reg 40 Lo
REG C0 40193 S 1000 Alternate Reg 41 Hi
REG C1 40194 S 1000 Alternate Reg 41 Lo
REG C2 40195 S 1000 Alternate Reg 42 Hi
REG C3 40196 S 1000 Alternate Reg 42 Lo
REG C4 40197 S 1000 Alternate Reg 43 Hi
REG C5 40198 S 1000 Alternate Reg 43 Lo
REG C6 40199 S 1000 Alternate Reg 44 Hi
REG C7 40200 S 1000 Alternate Reg 44 Lo
REG C8 40201 S 1000 Alternate Reg 45 Hi
REG C9 40202 S 1000 Alternate Reg 45 Lo
REG CA 40203 S 1000 Alternate Reg 46 Hi
REG CB 40204 S 1000 Alternate Reg 46 Lo
REG CC 40205 S 1000 Alternate Reg 47 Hi
REG CD 40206 S 1000 Alternate Reg 47 Lo
REG CE 40207 S 1000 Alternate Reg 48 Hi
REG CF 40208 S 1000 Alternate Reg 48 Lo
REG D0 40209 S 1000 Alternate Reg 49 Hi
REG D1 40210 S 1000 Alternate Reg 49 Lo
REG D2 40211 U 1000 Sys Wh Del Hi
REG D3 40212 U 1000 Sys Wh Del Lo
REG D4 40213 U 1000 Sys Wh Rec Hi
REG D5 40214 U 1000 Sys Wh Rec Lo
REG D6 40215 U 1000 Sys VARh Del Hi
REG D7 40216 U 1000 Sys VARh Del Lo
REG D8 40217 U 1000 Sys VARh Rec Hi
REG D9 40218 U 1000 Sys VARh Rec Lo
REG DA 40219 U 1000 Sys VAh Del Hi
REG DB 40220 U 1000 Sys VAh Del Lo
REG DC 40221 U 1000 Sys VAh Rec Hi
REG DD 40222 U 1000 Sys VAh Rec Lo
REG DE 40223 U 1000 Sys Qh Del Hi
REG DF 40224 U 1000 Sys Qh Del Lo
REG E0 40225 U 1000 Sys Qh Rec Hi
REG E1 40226 U 1000 Sys Qh Rec Lo
REG E2 40227 U 1000 Sys AMPh Hi
REG E3 40228 U 1000 Sys AMPh Lo
REG E4 40229 U 1000 Sys V2H Hi
REG E5 40230 U 1000 Sys V2H Lo
REG E6 40231 U 1000 Sys A2H Hi
REG E7 40232 U 1000 Sys A2H Lo

E-12
 Appendix E - MODBUS Communications

Read Input Registers (function 04) Point List

MODBUS PLC Register Contents Engineering Scaled
Address Address Units Range Range
REG 00 30001 Instantaneous Watts, Phase A, Del 0 – 10600 W 0 - 32767
REG 01 30002 Instantaneous Watts, Phase A, Rec 0 – 10600 W 0 - 32767
REG 02 30003 Instantaneous Watts, Phase B, Del 0 – 10600 W 0 - 32767
REG 03 30004 Instantaneous Watts, Phase B, Rec 0 – 10600 W 0 - 32767
REG 04 30005 Instantaneous Watts, Phase C, Del 0 – 10600 W 0 - 32767
REG 05 30006 Instantaneous Watts, Phase C, Rec 0 – 10600 W 0 - 32767
REG 06 30007 Instantaneous Watts, Poly, Del 0 – 31800 W 0 - 32767
REG 07 30008 Instantaneous Watts, Poly, Rec 0 – 31800 W 0 - 32767
REG 08 30009 Instantaneous VARs, Phase A, Del 0 – 10600 VAR 0 - 32767
REG 09 30010 Instantaneous VARs, Phase A, Rec 0 – 10600 VAR 0 - 32767
REG 0A 30011 Instantaneous VARs, Phase B, Del 0 – 10600 VAR 0 - 32767
REG 0B 30012 Instantaneous VARs, Phase B, Rec 0 – 10600 VAR 0 - 32767
REG 0C 30013 Instantaneous VARs, Phase C, Del 0 – 10600 VAR 0 - 32767
REG 0D 30014 Instantaneous VARs, Phase C, Rec 0 – 10600 VAR 0 - 32767
REG 0E 30015 Instantaneous VARs, Poly, Del 0 – 31800 VAR 0 - 32767
REG 0F 30016 Instantaneous VARs, Poly, Rec 0 – 31800 VAR 0 - 32767
REG 10 30017 Instantaneous VA, Phase A, Del 0 – 10600 VA 0 - 32767
REG 11 30018 Instantaneous VA, Phase A, Rec 0 – 10600 VA 0 - 32767
REG 12 30019 Instantaneous VA, Phase B, Del 0 – 10600 VA 0 - 32767
REG 13 30020 Instantaneous VA, Phase B, Rec 0 – 10600 VA 0 - 32767
REG 14 30021 Instantaneous VA, Phase C, Del 0 – 10600 VA 0 - 32767
REG 15 30022 Instantaneous VA, Phase C, Rec 0 – 10600 VA 0 - 32767
REG 16 30023 Instantaneous VA, Poly, Del 0 – 31800 VA 0 - 32767
REG 17 30024 Instantaneous VA, Poly, Rec 0 – 31800 VA 0 - 32767
REG 18 30025 Instantaneous Amps, Phase A 0 –20 A 0 - 32767
REG 19 30026 Instantaneous Amps, Phase B 0 –20 A 0 - 32767
REG 1A 30027 Instantaneous Amps, Phase C 0 –20 A 0 - 32767
REG 1B 30028 Instantaneous Amps, Neutral 0 –20 A 0 - 32767
REG 1C 30029 Instantaneous Volts, Phase A 0 – 530 V 0 - 32767
REG 1D 30030 Instantaneous Volts, Phase B 0 – 530 V 0 - 32767
REG 1E 30031 Instantaneous Volts, Phase C 0 – 530 V 0 - 32767
REG 1F 30032 Frequency 0 – 100 Hz 0 - 32767
REG 20 30033 Instantaneous PF, Phase A, Del 0 – 1.00 0 - 32767
REG 21 30034 Instantaneous PF, Phase A, Rec 0 – 1.00 0 - 32767
REG 22 30035 Instantaneous PF, Phase B, Del 0 – 1.00 0 - 32767
REG 23 30036 Instantaneous PF, Phase B, Rec 0 – 1.00 0 - 32767
REG 24 30037 Instantaneous PF, Phase C, Del 0 – 1.00 0 - 32767
REG 25 30038 Instantaneous PF, Phase C, Rec 0 – 1.00 0 - 32767
REG 26 30039 Instantaneous PF, Poly, Del 0 – 1.00 0 - 32767
REG 27 30040 Instantaneous PF, Poly, Rec 0 – 1.00 0 - 32767
REG 28 30041 Volts THD, Phase A 0 – 100 % 0 - 32767
REG 29 30042 Volts THD, Phase B 0 – 100 % 0 - 32767
REG 2A 30043 Volts THD, Phase C 0 – 100 % 0 - 32767
REG 2B 30044 Amps THD, Phase A 0 – 100 % 0 - 32767
REG 2C 30045 Amps THD, Phase B 0 – 100 % 0 - 32767
REG 2D 30046 Amps THD, Phase C 0 – 100 % 0 - 32767
E-13
JEMStar User Manual

MODBUS PLC Register Contents Engineering Scaled

Address Address Units Range Range
REG 2E 30047 Volts2 Phase A 0 – 280900 V2 0 - 32767
REG 2F 30048 Volts2 Phase B 0 – 280900 V2 0 - 32767
REG 30 30049 Volts2 Phase C 0 – 280900 V2 0 - 32767
REG 31 30050 Amps2 Phase A 0 – 400 A2 0 - 32767
REG 32 30051 Amps2 Phase B 0 – 400 A2 0 - 32767
REG 33 30052 Amps2 Phase C 0 – 400 A2 0 - 32767
REG 34 30053 Amps2 Poly 0 – 1200 A2 0 - 32767
REG 35 30054 Instantaneous Watts, Phase A, -10600 to -32768 to
Bidirectional +10600W +32767
REG 36 30055 Instantaneous Watts, Phase B, -10600 to -32768 to
Bidirectional +10600 W +32767
REG 37 30056 Instantaneous Watts, Phase C, -10600 to -32768 to
Bidirectional +10600 W +32767
REG 38 30057 Instantaneous Watts, Polyphase, -31800 to -32768 to
Bidirectional +31800 W +32767
REG 39 30058 Instantaneous VARs, Phase A, -10600 to -32768 to
Bidirectional +10600 VAR +32767
REG 3A 30059 Instantaneous VARs, Phase B, -10600 to -32768 to
Bidirectional +10600 VAR +32767
REG 3B 30060 Instantaneous VARs, Phase C, -10600 to -32768 to
Bidirectional +10600 VAR +32767
REG 3C 30061 Instantaneous VARs, Polyphase, -31800 to -32768 to
Bidirectional +31800 VAR +32767
REG 3D 30062 Instantaneous Uncompensated Watts, 0 – 10600 W 0 - 32767
Phase A, Del
REG 3E 30063 Instantaneous Uncompensated Watts, 0 – 10600 W 0 - 32767
Phase A, Rec
REG 3F 30064 Instantaneous Uncompensated Watts, 0 – 10600 W 0 - 32767
Phase B, Del
REG 40 30065 Instantaneous Uncompensated Watts, 0 – 10600 W 0 - 32767
Phase B, Rec
REG 41 30066 Instantaneous Uncompensated Watts, 0 – 10600 W 0 - 32767
Phase C, Del
REG 42 30067 Instantaneous Uncompensated Watts, 0 – 10600 W 0 - 32767
Phase C, Rec
REG 43 30068 Instantaneous Uncompensated Watts, 0 – 31800 W 0 - 32767
Poly, Del
REG 44 30069 Instantaneous Uncompensated Watts, 0 – 31800 W 0 - 32767
Poly, Rec
REG 45 30070 Instantaneous Uncompensated VARs, 0 – 10600 VAR 0 - 32767
Phase A, Del
REG 46 30071 Instantaneous Uncompensated VARs, 0 – 10600 VAR 0 - 32767
Phase A, Rec
REG 47 30072 Instantaneous Uncompensated VARs, 0 – 10600 VAR 0 - 32767
Phase B, Del
REG 48 30073 Instantaneous Uncompensated VARs, 0 – 10600 VAR 0 - 32767
Phase B, Rec
REG 49 30074 Instantaneous Uncompensated VARs, 0 – 10600 VAR 0 - 32767
Phase C, Del
REG 4A 30075 Instantaneous Uncompensated VARs, 0 – 10600 VAR 0 - 32767
Phase C, Rec
E-14
 Appendix E - MODBUS Communications

MODBUS PLC Register Contents Engineering Scaled

Address Address Units Range Range
REG 4B 30076 Instantaneous Uncompensated VARs, 0 – 31800 VAR 0 - 32767
Poly, Del
REG 4C 30077 Instantaneous Uncompensated VARs, 0 – 31800 VAR 0 - 32767
Poly, Rec
REG 4D 30078 Instantaneous Uncompensated VA, 0 – 10600 VA 0 - 32767
Phase A, Del
REG 4E 30079 Instantaneous Uncompensated VA, 0 – 10600 VA 0 - 32767
Phase A, Rec
REG 4F 30080 Instantaneous Uncompensated VA, 0 – 10600 VA 0 - 32767
Phase B, Del
REG 50 30081 Instantaneous Uncompensated VA, 0 – 10600 VA 0 - 32767
Phase B, Rec
REG 51 30082 Instantaneous Uncompensated VA, 0 – 10600 VA 0 - 32767
Phase C, Del
REG 52 30083 Instantaneous Uncompensated VA, 0 – 10600 VA 0 - 32767
Phase C, Rec
REG 53 30084 Instantaneous Uncompensated VA, 0 – 31800 VA 0 - 32767
Poly, Del
REG 54 30085 Instantaneous Uncompensated VA, 0 – 31800 VA 0 - 32767
Poly, Rec
REG 55 30086 Instantaneous Uncompensated PF, 0 – 1.00 0 - 32767
Phase A, Del
REG 56 30087 Instantaneous Uncompensated PF, 0 – 1.00 0 - 32767
Phase A, Rec
REG 57 30088 Instantaneous Uncompensated PF, 0 – 1.00 0 - 32767
Phase B, Del
REG 58 30089 Instantaneous Uncompensated PF, 0 – 1.00 0 - 32767
Phase B, Rec
REG 59 30090 Instantaneous Uncompensated PF, 0 – 1.00 0 - 32767
Phase C, Del
REG 5A 30091 Instantaneous Uncompensated PF, 0 – 1.00 0 - 32767
Phase C, Rec
REG 5B 30092 Instantaneous Uncompensated PF, 0 – 1.00 0 - 32767
Poly, Del
REG 5C 30093 Instantaneous Uncompensated PF, 0 – 1.00 0 - 32767
Poly, Rec
REG 5D 30094 Instantaneous Uncompensated Watts, -10600 to -32768 to
Phase A, Bidirectional +10600W +32767
REG 5E 30095 Instantaneous Uncompensated Watts, -10600 to -32768 to
Phase B, Bidirectional +10600 W +32767
REG 5F 30096 Instantaneous Uncompensated Watts, -10600 to -32768 to
Phase C, Bidirectional +10600 W +32767
REG 60 30097 Instantaneous Uncompensated Watts, -31800 to -32768 to
Polyphase, Bidirectional +31800 W +32767
REG 61 30098 Instantaneous Uncompensated VARs, -10600 to -32768 to
Phase A, Bidirectional +10600 VAR +32767
REG 62 30099 Instantaneous Uncompensated VARs, -10600 to -32768 to
Phase B, Bidirectional +10600 VAR +32767
REG 63 30100 Instantaneous Uncompensated VARs, -10600 to -32768 to
Phase C, Bidirectional +10600 VAR +32767
REG 64 30101 Instantaneous Uncompensated VARs, -31800 to -32768 to
Polyphase, Bidirectional +31800 VAR +32767
E-15
JEMStar User Manual

Extended Holding Registers (function 03)

JEMStar contains a number of Holding Registers that facilitate its use in energy monitoring and
management systems and to provide limited access to Load Profile data. This section describes those
registers and their interpretation. They are read using Function Code 03, the same as the basic Holding
Registers.

MODBUS JEMStar Parameter Units Format Number of

Register Registers
Instantaneous
Amps, phase A Primary milli-
1000 Long 2
amps
Amps, phase B Primary milli-
1002 Long 2
amps
Amps, phase C Primary milli-
1004 Long 2
amps
Amps, phase N Primary milli-
1006 Long 2
amps
Amps polyphase Primary milli-
1008 Long 2
amps
Volts, L-L, phase A-B Primary milli-
1010 Long 2
amps
Volts, L-L, phase B-C Primary milli-
1012 Long 2
volts
Volts, L-L, phase C-A Primary milli-
1014 Long 2
volts
Volts, L-L, polyphase Primary milli-
1016 Long 2
volts
Volts, L-N, phase A-N Primary milli-
1018 Long 2
volts
Volts, L-N, phase B-N Primary milli-
1020 Long 2
volts
Volts, L-N, phase C-N Primary milli-
1022 Long 2
volts
Volts, L-N, polyphase Primary milli-
1024 Long 2
volts
1026 Frequency HZ.hundredths Int 1
1027 PF Delivered, phase A PF.milli Int 1
1028 PF Delivered, phase B PF.milli Int 1
1029 PF Delivered, phase C PF.milli Int 1
1030 PF Delivered, polyphase PF.milli Int 1
1031 PF Received, phase A PF.milli Int 1
1032 PF Received, phase B PF.milli Int 1
1033 PF Received, phase C PF.milli Int 1
1034 PF Received, polyphase PF.milli Int 1
1035 THD, Amps, phase A percent. milli Long 2
1037 THD, Amps, phase B percent. milli Long 2
1039 THD, Amps, phase C percent. milli Long 2
1041 THD, Volts, phase A-N percent. milli Long 2
1043 THD, Volts, phase B-N percent. milli Long 2
1045 THD, Volts, phase C-N percent. milli Long 2
1047 THD, Volts, phase A-B percent. milli Long 2
E-16
 Appendix E - MODBUS Communications

MODBUS JEMStar Parameter Units Format Number of

Register Registers
1049 THD, Volts, phase B-C percent. milli Long 2
1051 THD, Volts, phase C-A percent. milli Long 2
W Delivered, phase A Primary
1053 Long 2
xW.milli
W Delivered, phase B Primary
1055 Long 2
xW.milli
W Delivered, phase C Primary
1057 Long 2
xW.milli
W Delivered, polyphase Primary
1059 Long 2
xW.milli
1061 Real/Apparent Power UOM to Kilo conversion factor power of ten Int 1
VAR Delivered, phase A Pri xVAR.
1062 Long 2
milli
VAR Delivered, phase B Pri xVAR.
1064 Long 2
milli
VAR Delivered, phase C Pri xVAR.
1066 Long 2
milli
VAR Delivered, polyphase Pri xVAR.
1068 Long 2
milli
1070 Reactive/Q Power UOM to Kilo Conversion Factor power of ten Int 1
1071 VA Delivered, phase A Pri xVA. milli Long 2
1073 VA Delivered, phase B Pri xVA. milli Long 2
1075 VA Delivered, phase C Pri xVA. milli Long 2
1077 VA Delivered, polyphase Pri xVA. milli Long 2
1079 Real/Apparent Power UOM to Kilo conversion factor power of ten Int 1
W Received, phase A Primary
1080 Long 2
xW.milli
W Received, phase B Primary
1082 Long 2
xW.milli
W Received, phase C Primary
1084 Long 2
xW.milli
W Received, polyphase Primary
1086 Long 2
xW.milli
1088 Real/Apparent Power UOM to Kilo conversion factor power of ten Int 1
VAR Received, phase A Pri xVAR.
1089 Long 2
milli
VAR Received, phase B Pri xVAR.
1091 Long 2
milli
VAR Received, phase C Pri xVAR.
1093 Long 2
milli
VAR Received, polyphase Pri xVAR.
1095 Long 2
milli
1097 Reactive/Q Power UOM to Kilo Conversion Factor power of ten Int 1
1098 VA Received, phase A Pri xVA. milli Long 2
1100 VA Received, phase B Pri xVA. milli Long 2
1102 VA Received, phase C Pri xVA. milli Long 2
1104 VA Received, polyphase Pri xVA. milli Long 2
1106 Real/Apparent Power UOM to Kilo conversion factor power of ten Int 1
Watts, bi-directional, phase A Primary
1107 Long 2
xW.milli
Watts, bi-directional, phase B Primary
1109 Long 2
xW.milli
E-17
JEMStar User Manual

MODBUS JEMStar Parameter Units Format Number of

Register Registers
Watts, bi-directional, phase C Primary
1111 Long 2
xW.milli
Watts, polyphase, bi-directional Primary
1113 Long 2
xW.milli
1115 Real/Apparent Power UOM to Kilo conversion factor power of ten Int 1
VARs, bi-directional, phase A Pri xVAR.
1116 Long 2
milli
VARs, bi-directional, phase B Pri xVAR.
1118 Long 2
milli
VARs, bi-directional, phase C Pri xVAR.
1120 Long 2
milli
VAR polyphase, bi-directional Pri xVAR.
1122 Long 2
milli
1124 Reactive/Q Power UOM to Kilo Conversion Factor power of ten Int 1
Average Power Factors
1200 PF Delivered, phase A pf.milli Int 1
1201 PF Delivered, phase B pf.milli Int 1
1202 PF Delivered, phase C pf.milli Int 1
1203 PF Delivered, polyphase pf.milli Int 1
1204 PF Received, polyphase pf.milli Int 1
Consumption
Wh Delivered Mod 10
1205 pri xWh.milli 3
x3
Wh Received Mod 10
1208 pri xWh.milli 3
x3
1211 Real/Apparent Energy UOM to Kilo conversion factor power of ten Int 1
VARh Delivered pri Mod 10
1212 3
xVARh.milli x3
VARh Received pri Mod 10
1215 3
xVARh.milli x3
1218 Reactive/Q Energy UOM to Kilo Conversion Factor power of ten Int 1
VAh Delivered Mod 10
1219 pri xVAh.milli 3
x3
VAh Received Mod 10
1222 pri xVAh.milli 3
x3
1225 Real/Apparent Energy UOM to Kilo conversion factor power of ten Int 1
Qh Delivered Mod 10
1226 pri xQh.milli 3
x3
Qh Received Mod 10
1229 pri xQh.milli 3
x3
1232 Reactive/Q Energy UOM to Kilo Conversion Factor power of ten Int 1
Amphours pri Ah.milli- Mod 10
1233 3
UOM x3
Amp2hours pri kAh.milli- Mod 10
1236 3
UOM x3
1239 Amps/Amp2 UOM to Kilo conversion factor power of ten Int 1
Volt2hours pri kAh.milli- Mod 10
1240 3
UOM x3
2
1243 Volts UOM to Kilo conversion factor power of ten Int 1
Demand
Demand - W Delivered Primary
1244 Long 2
xW.milli
E-18
 Appendix E - MODBUS Communications

MODBUS JEMStar Parameter Units Format Number of

Register Registers
Peak Demand - W Delivered Primary
1246 Long 2
xW.milli
Prev Billing Period Peak Demand - W Delivered Primary
1248 Long 2
xW.milli
1250 Real/Apparent Power UOM to Kilo conversion factor power of ten Int 1
Demand - VAR Delivered Primary
1251 Long 2
xVAR.milli
Peak Demand - VAR Delivered Primary
1253 Long 2
xVAR.milli
Prev Billing Period Peak Demand - VAR Delivered Primary
1255 Long 2
xVAR.milli
1257 Reactive/Q Power UOM to Kilo Conversion Factor power of ten Int 1
Demand - VA Delivered Primary
1258 Long 2
xVA.milli
Peak Demand - VA Delivered Primary
1260 Long 2
xVA.milli
Prev Billing Period Peak Demand - VA Delivered Primary
1262 Long 2
xVA.milli
1264 Real/Apparent Power UOM to Kilo conversion factor power of ten Int 1
Demand Prediction
Predicted Demand - W Delivered, polyphase Primary
1265 Long 2
xW.milli
Predicted Demand - VAR Delivered, polyphase Primary
1267 Long 2
xVAR.milli
Predicted Demand - VA Delivered, polyphase Primary
1269 Long 2
xVA.milli
1271 Real/Apparent Power UOM to Kilo conversion factor power of ten Int 1
1272 Reactive/Q Power UOM to Kilo Conversion Factor power of ten Int 1
Demand Current
Demand Current Phase A Primary milli-
1273 Long 2
amps
Demand Current Phase B Primary milli-
1275 Long 2
amps
Demand Current Phase C Primary milli-
1277 Long 2
amps
Demand Current Phase N Primary milli-
1279 Long 2
amps
Peak Demand Current Phase A Primary milli-
1281 Long 2
amps
Peak Demand Current Phase B Primary milli-
1283 Long 2
amps
Peak Demand Current Phase C Primary milli-
1285 Long 2
amps
Peak Demand Current Phase N Primary milli-
1287 Long 2
amps
Time of Peak Demand
W Delivered, polyphase
1289 Time 3
VAR Delivered, polyphase
1292 Time 3
VA Delivered, polyphase
1295 Time 3

E-19
JEMStar User Manual

MODBUS JEMStar Parameter Units Format Number of

Register Registers
Demand Current Phase A
1298 Time 3
Demand Current Phase B
1301 Time 3
Demand Current Phase C
1304 Time 3
Demand Current Phase N
1307 Time 3
Prev Billing Period Peak W Delivered
1310 Time 3
Prev Billing Period Peak VAR Delivered
1313 Time 3
Prev Billing Period Peak VA Delivered
1316 Time 3
Coincident Power Factor
1319 when W Delivered was peak last billing period PF.milli Int 1
1320 when VAR Delivered was peak last billing period PF.milli Int 1
1321 when VA Delivered was peak last billing period PF.milli Int 1
Pulse Inputs
1400 Input 1 Int 1
1401 Input 2 Int 1
Scratchpad (WRITABLE)
1600 - 1619 20 registers writable by system Int 1 ea
Configuration
1700 Meter ID or Type (unique for each Model) Int 1
Date / Time
1702 - 1704 Time 3
1705 - 1707 Register Firmware Version Int 3
1708 Class Int 1
1709 Health Status Int 1
1710 VT Ratio (x:1) Long 2
1712 CT Ratio (x:1) Long 2
1714 W/ VA/ Wh/ VAh Primary Unit of Measure power of ten Int 1
1715 VAR/ Q/ VARh/ Qh Primary Unit of Measure power of ten Int 1
1716 Volt Primary Unit of Measure power of ten Int 1
1717 Amp Primary Unit of Measure power of ten Int 1
1718 Volt Primary Squared Unit of Measure power of ten Int 1
1719 Amp Primary Squared Unit of Measure power of ten Int 1
1720 Connection Type Int 1
1721 Demand Method Int 1
1722 Demand Interval Int 1
1723 Demand Subinterval Int 1
Configured number of display items in Normal Display
1724 List (See MODBUS registers 1800 - 1999, 12000 - Int 1
12749)
Configured number of display items in Alternate
1725 Display List (See MODBUS registers 2000 - 2199, Int 1
13000 - 13749)

E-20
 Appendix E - MODBUS Communications

MODBUS JEMStar Parameter Units Format Number of

Register Registers
Configured number of display items in Internal Display
1726 Int 1
List (See MODBUS registers 14000 - 14749)
Configured number of Load Profile channels (See
1727 Int 1
MODBUS registers 15000 - 15179)
Display Registers
1800-1999 Normal Display List Registers (up to 50 entries) Display 4 ea
2000 - 2199 Alternate Display List Registers (up to 50 entries) Display 4 ea
Load Profile
2900 - 2919 Data Log Header Int 22
Data Log Table of Contents (36 scratchpad registers
2950 - 2985 Int 36
writable by system)
Load Profile data LP
3000 - 10799 200 records
Record
Display Register and Load Profile Channel
Descriptions
12000 - Normal Display List Register Map / Index (50 entries) Reg
15 ea
12749 Desc
13000 - Alternate Display List Register Map / Index (50 entries) Reg
15 ea
13749 Desc
14000 - Internal Display List Register Map / Index (50 entries) Reg
15 ea
14749 Desc
15000 - Load Profile Channel Map / Index (12 entries) Reg
15 ea
15179 Desc

Scaling Factors

Note: These MODBUS registers are scaling factors expressed as powers of ten that, when multiplied by
the appropriate power or energy registers, give readings in primary kilo-units (e.g. kilowatts,
kilowatthours).

MODBUS Register(s) Measurement Type

1061, 1079, 1088, 1106, 1115, 1211, 1225, 1250, 1264, 1271 Watt, Watthour, VA, VAhour
1070, 1097, 1124, 1218, 1232, 1257, 1272, VAR, VARhour, Q, Qhour
1239 Amp, Amp2, Amphour, Amp2hour
1243 Volt2, Volt2hour

Special Data Formats

These Registers have special or unusual formatting:

• Pulse Input 1(MODBUS register 1400): Reads 0 if JEMStar Contact Input 1 is off, 1 if on.
• Pulse Input 2 (MODBUS register 1401): Reads 0 if JEMStar Contact Input 2 is off, 1 if on.
• Meter ID (MODBUS register 1700): and unique identification number assigned by Square-D.
JEMStar returns 15220.
• Register Firmware Version (MODBUS registers 1705 - 1701): Three MODBUS registers, each
containing 2 digits of the JEMStar Register Firmware version number. Display each register's
contents as a 2-digit hexadecimal number, and separate the registers with periods. (E.g.
"B3.00.12")
• Health Status (MODBUS register 1709): A series of bits giving the present health status of the
JEMStar:
(MSB)-> 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 <-(LSB)
E-21
JEMStar User Manual

Bit Meaning
16 1 = Battery Warning. Cumulative time on battery exceeds 2 years.
15 1 = Configuration error - using default configuration
14 1 = Site Monitor alarm condition is present
13 1 = External status input is ON
12 1 = Threshold 1 alarm condition is present
11 1 = Threshold 2 alarm condition is present
10 1 = Threshold 3 alarm condition is present
9 1 = Threshold 4 alarm condition is present
8 1 = (reserved)
7 1 = (reserved)
6 1 = (reserved)
5 1 = (reserved)
4 1 = (reserved)
3 1 = Phase C voltage active
2 1 = Phase B voltage active
1 1 = Phase A voltage active
• VT Ratio (MODBUS registers 1710 - 1711): The meter's configured external Voltage
Transformer ratio multiplied by 1000.
• CT Ratio (MODBUS registers 1712 - 1713): The meter's configured external Current
Transformer ratio multiplied by 1000.
• W/ VA/ Wh/ VAh Primary Unit of Measure (MODBUS register 1714): A power of ten showing
the configured Unit of Measure for Real and Apparent power and energy measurements:
0 = units (watts, VA)
3 = kilo units
6 = mega units
9 = giga units
• VAR/ Q/ VARh/ Qh Primary Unit of Measure (MODBUS register 1715): A power of ten
showing the configured Unit of Measure for Reactive and Q power and energy measurements:
0 = units (VAR, Q)
3 = kilo units
6 = mega units
9 = giga units
• Volt Primary Unit of Measure (MODBUS register 1716): A power of ten showing the configured
Unit of Measure for Volt measurements:
0 = units (volts)
3 = kilo units
6 = mega units
• Amp Primary Unit of Measure (MODBUS register 1717): A power of ten showing the
configured Unit of Measure for Amp measurements:
0 = units (amps)
3 = kilo units
6 = mega units
• Volt Primary Squared Unit of Measure (MODBUS register 1718): A power of ten showing the
configured Unit of Measure for Volts Squared measurements:
0 = units (volts squared)
3 = kilo units
6 = mega units
• Amp Primary Squared Unit of Measure (MODBUS register 1719): A power of ten showing the
configured Unit of Measure for Amp Squared measurements:
E-22
 Appendix E - MODBUS Communications

0 = units (amps squared)

3 = kilo units
6 = mega units
• Connection Type (MODBUS register 1720): The meter service connection type. A 3-wire Delta
connection returns 30, while a 4-wire Wye returns 40.
• Demand Method (MODBUS register 1721): A bit field indicating the demand methods
configured in the meter.
(MSB)-> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 E S <-(LSB)
Where: E is the External Demand Interval Sync Enabled bit (1 = external demand sync, 0 =
internal sync).
S is the Sliding Window Demand indicator (1 = sliding window, 0 = fixed window)
• Demand Interval (MODBUS register 1722): The JEMStar's demand interval length in minutes.
• Demand Subinterval (MODBUS register 1723): The JEMStar's demand subinterval length in
minutes.
• Number of Normal Display Registers (MODBUS register 1724): The number of display registers
(max. 50) currently configured in the Normal display list.
• Number of Alternate Display Registers (MODBUS register 1725): The number of display
registers (max. 50) currently configured in the Alternate display list.
• Number of Internal Display Registers (MODBUS register 1726): The number of display registers
(max. 50) currently configured in the Internal display list.
• Number of Load Profile Channels (MODBUS register 1727): The number of Load Profile pulse
channels (max. 12) currently configured in the meter.

MODBUS Register Formats

These extended MODBUS holding registers come in a variety of formats. These formats are described
here.

Int

The Int type is a signed 16-bit integer number. It is the basic MODBUS register.

Long

The Long is two MODBUS registers sent consecutively to form a 32-bit value. The first register contains
the sign bit and the 15 most significant bits of the value. The second register contains the remaining 16
least significant bits.

Time

The Time format is three MODBUS registers sent consecutively to form a date-time group encoded thus:
Upper 8 bits Lower 8 bits
First register Month (1 - 12) Day (1 - 31)
Second register Year (0 - 199) Hour (0 - 23)
Third register Minute (0 - 59) Second (0 - 59)

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JEMStar User Manual

Mod10 x 3

The Mod10 x 3 format is three MODBUS registers sent consecutively to form a 12-digit decimal value
encoded thus:
First register: 4 least significant (of 12) digits of complete value, in binary
(0 - 9999)
Second register: 4 middle (of 12) digits of complete value, in binary (0 - 9999)
Third register: 4 most significant (of 12) digits of complete value, in binary
(0 - 9999)
Therefore, the complete value is (R3 * 10^8) + (R2 & 10^4) + R1. This format can accommodate values
from 0 to 999,999,999,999 decimal.

Display

The Display format varies depending on the exact definition of a given display item by the user. JEMStar
Displays can contain a numeric value expressed as a Long or a Mod x 3 format with a primary scaling
factor, a Long format without scaling, or a Time format.
Each Display has a corresponding Register Description (see Reg Desc below) that contains, among other
things, a "Format Type" field that explains how to interpret that Display's data.

LP Record

The Load Profile Record contains the Load Profile data for a single interval. This format consists of a
time stamp (in the Time format described here) followed by 1 to 12 pulse channels depending on the
meter's configuration. Each pulse channel is three MODBUS registers in the format R1 * R2 * 10^R3.
The first register is a pulse count, the second register is a pulse weight (in, for example, Watthours per
pulse), and the third register is a power of ten. The complete interval's accumulation for that channel is
found by multiplying the first register by the second register, then multiplying the result by 10 raised to
the power in the third register.

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 Appendix E - MODBUS Communications

LP Header

The Load Profile Header is a data structure that describes the JEMStar's implementation of Load Profile
for MODBUS retrieval:

Register Register Name Register Description Notes

Offset
0 Table of Contents Beginning register of record which lists the This is a pointer to the block where the
register numbers that are being logged for 1-12 channels are defined by listing the
this data log. (0 specifies that the data log is first register corresponding to the value
not being used) logged in that register. JEMStar reads
Register 2950
1 File Type Specifies the file type, i.e., data log, JEMStar reads 1
waveform capture, etc. (Set to 1 for Data
Log)
2 File Size The file size in records, max = 32000 JEMStar reads 200
3 Record Size Record size in registers, max 39 including Calculated by JEMStar based on
date/time stamp. Table of contents will hold Recorder Contents
(Record Size - 3) registers
4 File Mode 0 = FIFO, 1 = Fill and Hold Always 0 for the JEMStar
5 Record Entry Enable Record entry enable (FFFF)/disable(0000) JEMStar is FFFF by default
/ Disable for data log files
6 Entry Update Interval Entry update interval (in minutes) for data JEMStar's configured Load Profile
log files synchronized to entry interval interval length, in minutes.
offset time
7 Entry Interval Offset Time (in minutes) past midnight to Always 0 for JEMStar
Time synchronize record entry update intervals to
8 Current # Records in Current number of records in the file Managed by JEMStar. Maximum 200
File
9 Current first record Current first (oldest) record sequence Managed by JEMStar. Ranges from 1
sequence number in the file to 32000
10 Current last record Current last (newest) record sequence Managed by JEMStar. Ranges from 1
sequence number in the file to 32000
11 Date/Time of last file Date/Time of last file reset/clear in 3 Date & Time at which JEMStar Load
reset/clear register format Profile was reinitialized (reconfigured).
14 Allocated File Size File size allocated during last file resize, in (same as Offset 2)
records
15 Allocated Record Record size (in registers) allocated during (same as Offset 3)
Size the last file resize, including the date/time
stamp
16 File Status Status of the file based on actual and JEMStar always reads 0 (OK)
allocated file size and record size
17 File Location Starting register number for file JEMStar always reads 3000
18 Cont. WFC Segment Continuous WFC segment limit may be set N/A = -32768
Delay in range 1-5
19 Cont. WFC Trigger Number of Pre-Trigger Cycles to obtain N/A = -32768
Delay when a continuous WFC occurs. Applicable
only to the Cont. WFC File Only. Reserved
for all others.
20 Oldest Record Register number at start of oldest record in Location of record corresponding to
file. sequence number stored at Offset 9.
21 Newest Record Register number at start of newest record in Location of record corresponding to
file. sequence number stored at Offset 10.

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JEMStar User Manual

Reg Desc

Each JEMStar Display Register and Load Profile Channel has a corresponding "Register Description"
(Reg Desc) that tells the host system how to interpret its data.
Every Register Description contains 15 MODBUS registers that fully describes the Display or Load
Profile Channel. Four of these registers contain bit fields that detail the operation of the Display or
Channel.

Offset Name Contents

0 Reg Type Describes the Type (Numeric, Time, Status, ID, or Totalization) of
Display Register or Load Profile channel
1 Quantity Type Describes the measurement quantity of a Numeric or Totalization
(Used only if Reg Type is Display Register or Load Profile channel
Numeric or Totalization,
otherwise contains zero)
2 Demand Quantity Type If this Display Register is a Coincident Demand, this describes the
(Used only if Reg Type is measurement quantity of the Peak Demand associated with it.
Numeric Coincident Demand
to indicate quantity of
associated Peak demand.
Otherwise contains zero)
3 Reg Format This describes how the Display Register or Load Profile channel data is
to be interpreted and formatted for display.
4 Reg ID Number The Identification number assigned by the user to this Display Register,
or the Load Profile Channel Number.
5 - 14 Text Description 20 bytes of text, padded with nulls, that the user assigned to be displayed
with this Display Register. This will contain all nulls for Load Profile
channels.

Reg Type

The Reg Type register contains a number of bit fields that describe the basic type of the Display Register
or Load Profile channel.
Reg Type: (MSB)-> t t t a a a l l d d d n n n n n <-(LSB)
Where:
t t t is the Register Type:
0 = Numeric (Power) Display Register or Channel
1 = Time Display Register
2 = Status Display Register
3 = ID Display Register
4 = Unused Register
5 = Totalization Display Register or Channel
a a a is the Display Register or Channel Algorithm:
0 = Demand
1 = Consumption
2 = Average PF
3 = Peak Demand
4 = Instantaneous
5 = Thermal
6 = Peak Thermal
7 = Demand Prediction

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 Appendix E - MODBUS Communications

l l is the Demand Algorithm, and is used only for Demand, Peak Demand, or Peak Thermal Registers or
Channels:
For Demand Registers or Channels:
0 = Unused
1 = Past Interval Demand
2 = Present Interval Demand
For Peak Demand Registers:
0 = Peak Demand
1 = Time of Peak Demand
2 = Coincident Demand
3 = Date of Peak Demand
For Peak Thermal Registers:
0 = Peak Thermal
1 = Time of Peak Thermal
2 = Unused
3 = Date of Peak Thermal
d d d is the Display Update:
0 = Working (value updates at any time)
1 = Freeze (value updates on communications Freeze)
2 = Season (value updates on TOU Season Change)
3 = Billing Period Reset (value updates on BPR)
4 = Cumulative (Peak Demand value accumulates on BPR)
5 = Continuous Cumulative (Peak Demand value accumulates on BPR and Demand Interval)
n n n n n is a Selection Number that defines which Status, ID, or Time value, or Totalization channel,
this Display Register contains:
For Time Registers:
0 = Present Time - present value of the meter clock
1 = Last BPR Time - time of the last Billing Period Reset
2 = Last Freeze Time - time of the last communications Freeze
3 = Last Season Time - time of last Time of Use season change
4 = Next DST Time - time of next Daylight Saving Time change
5 = Present Date - present value of the meter clock
6 = Last BPR Date - date of the last Billing Period Reset
7 = Last Freeze Date - date of the last Register Freeze
8 = Last Season Date - date of the last Time of Use season change
9 = Next DST Date - date of the next Daylight Saving Time change
10 = Test Time Remaining - time remaining in meter Test Mode
11 = Demand Time Remaining - time remaining in present Demand Interval
12 = Days On Battery - number of days meter has used backup battery power (i.e.
cumulative outage time)
For Status Registers:
0 = Present Status - present System Status Word.
1 = Latched Status Word - "sticky" System Status Word. Shows conditions that have set a
Status bit in the System Status Word but have since gone away.
2 = Last BPR Status - System Status Word at last Billing Period Reset
3 = Last Freeze Status - System Status Word at last communications Freeze
4 = Last Season Status - System Status Word at last Time of Use season change
5 = Register Firmware Version - JEMStar register firmware version (no numeric value)
6 = Metrology Firmware Version - JEMStar metrology firmware version (no numeric
value)

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JEMStar User Manual

7 = Blank - blank display (no numeric value)

8 = Segment Check - all display segments active (no numeric value)
9 = Phasor V - 2- or 3-phase voltage vector display (no numeric value)
10 = Phasor A - 2- or 3-phase current vector display (no numeric value)
11 = Phasor VaIa - Phase A voltage and current vector display (no numeric value)
12 = Phasor VbIb - Phase B voltage and current vector display (no numeric value)
13 = Phasor VcIc - Phase C voltage and current vector display (no numeric value)
14 = BPR Count - cumulative number of Billing Period Resets that have occurred
15 = Outage Count - cumulative number of power outages that have occurred
For ID Registers:
0 = Label 1 - User-defined label 1 (default "Meter Name")
1 = String 1
2 = Label 2 - User-defined label 1 (default "Administrator")
3 = String 2
4 = Label 3 - User-defined label 1 (default "Location")
5 = String 3
6 = Label 4 - User-defined label 1 (default "Configuration ID")
7 = String 4
8 = Label 5 - User-defined label 1 (default "Account Number")
9 = String 5 (Selector value 9)
For Totalization registers, the Selection Number contains the number of the Totalization Channel
(1 - 12) that is being displayed.

Quantity Type

The Quantity Type register describes the basic quantity being measured by the Display Register or Load
Profile channel. Quantity Type is valid only if the associated Reg Type indicates this is a Numeric or
Totalization Register.
(MSB)-> q q q q e e e d d d r r r r c i <-(LSB)
Where:
q q q q is the base electrical Measurement Quantity:
0 = Watts (Watthours)
1 = VAR (VARhours)
2 = VA (VAhours)
3 = Amps (Amphours)
4 = Q (Qhours)
5 = PF
6 = Volts
7 = Frequency
8 = Volts THD
9 = Amps THD
10 = External Count (Load Profile only)
11 = External Status (Load Profile only)
12 = Amps Squared (Amp Squared hours)
13 = Volts Squared (Volt Squared hours)
e e e is the Element or Phase on which the measurement is taken:
0 = No element - Not applicable to any element or line phase. (Frequency only)
1 = Polyphase - Sum or net of all phases. (If Channel Quantity is Volts or Volts Squared,
Polyphase means an average of all phases.)
2 = Phase A - Measured on Phase A.

E-28
 Appendix E - MODBUS Communications

3 = Phase B - Measured on Phase B.

4 = Phase C - Measured on Phase C.
5 = Neutral - Measured on Neutral line. (Amps only)
6 = Phase Average - Average of all phases. (Amps or Amps Squared only)
d d d is the Direction of the measured quantity
0 = No direction - Directionless quantities such as volts or amps.
1 = Delivered - Power flowing from the line side of the meter to the load.
2 = Received - Power flowing from the load side of the meter to the line.
3 = Quadrant 1 - Delivered watts, lagging VARs. (VARs only)
4 = Quadrant 2 - Received watts, leading VARs. (VARs only)
5 = Quadrant 3 - Received watts, lagging VARs. (VARs only)
6 = Quadrant 4 - Delivered watts, leading VARs. (VARs only)
r r r r is the Time of Use Rate during which the quantity is measured.
0 = Total - Register is always active.
1 = Rate A - Register measures only during TOU Rate A.
2 = Rate B - Register measures only during TOU Rate B.
3 = Rate C - Register measures only during TOU Rate C.
4 = Rate D - Register measures only during TOU Rate D.
5 = Rate E - Register measures only during TOU Rate E.
6 = Rate F - Register measures only during TOU Rate F.
7 = Rate G - Register measures only during TOU Rate G.
8 = Rate H - Register measures only during TOU Rate H.
c is the Compensation flag:
0 = Value has Transformer Loss Compensation applied (if applicable)
1 = Value is not compensated.
i is the Integrated Quantity flag:
0 = Quantity is instantaneous or average (i.e. Demand, Instantaneous, Thermal, etc.)
1 = Quantity is integrated (i.e. Consumption, Totalization)

Demand Quantity Type

The Demand Quantity Type register describes the basic quantity being measured by an associated Peak
Demand Display Register. It uses the same bit assignments as Quantity Type described above. It is valid
only if the associated Reg Type indicates this is a Coincident Demand Display Register.

Reg Format

The Reg Format register identifies the MODBUS data format used by the associated Display Register or
Load Profile channel.
(MSB)-> 0 0 0 0 f f f f d d d d c c c c <-(LSB)
Where:
f f f f is the Register Format identifier:
0 = No value - Register or Channel contains no displayable information
1 = Int - Display contains a single MODBUS register, remaining 3 registers are not used.
(Display Registers only)
2 = Long - Display contains a Long (2 MODBUS registers), remaining 2 registers are not used.
(Display Registers only)
3 = Time - Display contains a Time (3 MODBUS registers), last register is not used. (Display
Registers only)

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JEMStar User Manual

4 = Long + scale - Display contains a Long (2 MODBUS registers), 1 unused register, and the
last register is a Scale (power of 10). (Display Registers only)
5 = Mod x 3 + scale - Display contains a Mod x 3 (3 MODBUS registers) and the last register is a
Scale (power of 10). (Display Registers only)
6 = Load Profile channel - Display contains one Value (1 MODBUS register), one Multiplier (1
MODBUS register), and a Scale (power of 10). (Load Profile channels occupy only 3 MODBUS
registers.) (Load Profile channels only)
d d d d is the total number of digits of the value to be displayed. (Only for Numeric or Totalization
Display Registers.)
c c c c is the number of decimal places of the value to be displayed, and is part of the total number of
digits displayed. (Only for Numeric or Totalization Display Registers.)

Reg ID Number

The Identification number assigned by the user to this Display Register, or the Load Profile Channel
Number. The decimal value of this number is displayed with the Display Register.

Text Description

20 bytes of text, padded with nulls, that the user assigned to be displayed with this Display Register. This
will contain all nulls for Load Profile channels.

E-30
 APPENDIX F
ANSI TABLES COMMUNICATION
INTRODUCTION
The utility metering industry – utility companies, equipment vendors, government and standards
agencies – has created a standardized method of retrieving meter data. The ANSI Standard C12.19 -
1997 “Utility Industry End Device Data Tables” (or “ANSI Tables”) describes a set of data tables that
are used to represent all types of metering data. The specification defines the data structures used to
represent data involved in the configuration, control, and reading of utility meters. This does not define
any process or behavior – it is strictly intended for data structure (table) definitions. It is recommended
that you review the Standard before operating the JEMStar meter with ANSI Tables Protocol. Note that
the Standard does not require the entire set of Data Tables to be implemented.

TABLE ORGANIZATION
ANSI Data Tables are numbered and grouped into “Decades” that are associated with a particular
metering function. For example, Decade 0 (Tables 00 - 09) describes the end device (meter)
configuration, identification, and procedural capabilities. Decade 1 (Tables 10 - 19) describes data
sources such as device inputs, units of measure, etc.
Individual tables are built from basic data types that are also defined in ANSI C12.19. These basic types
include Boolean, integer, character, and floating-point representations of various sizes. Basic types are
collected into arrays, and combinations of singles and arrays are collected into tables.

F-1
JEMStar User Manual

COMMUNICATION METHODS
Three related ANSI Standards define the protocols for transmitting ANSI Tables over various
communication channels. The JEMStar meter is fully compliant with all communication types.
• ANSI C12.18-1996, “Protocol Specification for ANSI Type 2 Optical Port”
• ANSI C12.21-1999, “Protocol Specification for Telephone MODEM Communication”
• ANSI C12.22, “Protocol Specification for Interfacing to Data Communication Networks”
(unapproved draft)

ANSI Type 2 Optical Port Protocol (C12.18)

ANSI C12.18 defines the physical structure and dynamic processes required to send and receive ANSI
Data Tables via an optical communications interface. The Optical Port Protocol describes how to
establish a connection with the meter, negotiate communication parameters, establish user identity and
privileges, perform various functions, and send and receive data tables. Since the Optical Port cannot
support multiple end devices on a single connection, it makes no provision for unique device addresses.

ANSI Telephone Modem Protocol (C12.21)

ANSI C12.21 defines the dynamic processes required to send and receive ANSI Data Tables via a dial-
up modem connection. C12.21 does not define the process for establishing a modem connection – it
picks up responsibility for communication after the modem connection is established.
The Telephone Modem Protocol describes how to negotiate communication parameters, establish user
identity and privileges, perform various functions, and send and receive data tables. Since a single
modem may serve multiple meters, the Telephone Modem Protocol provides for individual end device
addressing on a multidrop connection.

ANSI Network Protocol (C12.22)

ANSI C12.22 defines the dynamic processes required to send and receive ANSI Data Tables via a
network connection. C12.22 is not an approved standard, but is mentioned here for future reference. At
this time, there is no JEMStar implementation specifically related to C12.22.

F-2
 Appendix F - ANSI Tables Communication

ANSI TABLES IMPLEMENTATION IN JEMSTAR

ANSI Tables protocol is available on all JEMStar serial communication interfaces, standard or optional.
You can configure a serial interface either via JEMWare configuration software or though the meter
front-panel menu system. ANSI Tables protocol can be operated on one or more of the meter’s serial
interfaces. Using ANSI Tables on one serial port does not interfere with the use of ANSI Tables (or a
different protocol) on any other port.

Optical Port
If a JEMStar is configured for ANSI Tables on the Optical port, it will automatically use the C12.18
Optical Port protocol. For connecting an Optical Adapter to the meter, refer to the section titled
“Communication Ports” in Chapter 2 of this manual.

Modem Port
If a JEMStar is configured for ANSI Tables on the Modem port, it will automatically use the C12.21
Telephone Modem protocol. For connection details, refer to the section titled “Communication Ports” in
Chapter 2 of this manual.

Direct-connect (RS-232 or RS-485) Port

If a JEMStar is configured for ANSI Tables on an RS-232 or RS-485 port, it will automatically use the
C12.21 Telephone Modem protocol. For connection details, refer to the section titled “Communication
Ports” in Chapter 2 of this manual.

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JEMStar User Manual

Supported Data Tables

Only the following Tables are supported in the JEMStar meter. Rows shaded in gray are either
undefined by the ANSI C12.19 Standard, or not supported by JEMStar.

Decade 0
Decade 0 – Device Configuration, Identification, and Procedure Tables
Table Title Description Read /
No. Write
00. General config General info on end device configuration, data formats R
01. Manufacturer ID Manufacturer, HW and FW revision numbers R
02. Device Nameplate Nameplate data (form, class, voltage, freq, etc.) R
03. ED_MODE Present operating mode, present error / warning status R
Status
04. Pending Status Indicates pending status of tables in the meter
05. Device Device serial number R
Identification
06. Utility Utility and installation identification R
Information
07. Procedure Initiate Activate device procedures (BPR, etc.) * W
08. Procedure Results of previous Procedure Initiate (Table 07) write R
Response
09. (undefined)

*Supported Procedures in Table 07 (Procedure Initiate)

Procedure Procedure Name Description

Number
3 Clear Data Erase Registers & Load Profile, retain Configuration, try to retain Event Logs
6 Change End Enter or Exit Test Mode
Device Mode
7 Clear Standard Clear Health Check and other status flags
Status Flags
9 Remote Reset Billing Period Reset (Self Read, Season Change, and new Season not
supported in this procedure)
10 Set Date and/or Set Time and Date
Time
18 Log In Establish a user session
19 Log Out End a user session

F-4
 Appendix F - ANSI Tables Communication

Decade 1
Decade 1 – Data Source Tables
Table Title Description Read /
No. Write
10. Dimension Sources Maximum dimensions and end device capabilities
Limiting
11. Actual Sources Actual parameters configured in device R
Limiting
12. Unit of Measure Units of Measure, calculation methods (VA, etc.) R
13. Demand Control Demand interval, subinterval, and related info R
14. Data Control Data source selections (?) R?
15. Constants ? R?
16. Source Definition Available data sources selectable by other tables (such as Table 14)
17. (undefined)
18. (undefined)
19. (undefined)

Decade 2
Decade 2 – Register Tables
Table Title Description Read /
No. Write
20. Dimension Maximum dimensions of measured data registers
Register Limiting
21. Actual Register Actual function values for registers R
22. Data Selection Grouped lists of source indices into Table 16.
23. Current Register Current Register Data R
Data
24. Previous Season Register Data as of most recent Season Change R
Data
25. Previous Demand Register Data as of most recent Demand Reset R
Reset Data
26. Self Read Data Register Data as of most recent Self Read event R
27. Present Register Lists of source indices into Table 16.
Selection
28. Present Register Present demand and values selected by Table 27
Data
29. (undefined)

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JEMStar User Manual

Decade 3
Decade 3 – Local Display Tables
Table Title Description Read /
No. Write
30. Dimension Maximum dimensional values for local display operation
Display Limiting
31. Actual Display Actual dimensional values for local display operation R
32. Display Source Select source data for local display R?
33. Primary Display Configuration of Primary display list (data, timing, scroll, etc.)
List
34. Secondary Configuration of Secondary display list (data, timing, scroll, etc.)
Display List
35. (undefined)
36. (undefined)
37. (undefined)
38. (undefined)
39. (undefined)

Decade 4
Decade 4 – Security Tables
Table Title Description Read /
No. Write
40. Dimension Maximum number of passwords and security access levels in end
Security Limiting device
41. Actual Security Actual number of passwords and security access levels in end R
Limiting device
42. Security Passwords; Read, Write, and Execute permission flags R?
43. Default Access Default table and procedure access permissions (for tables not R?
Control included in Table 44)
44. Access Control Table and procedure access permissions for tables not using default R?
access control
45. Key Authentication and / or encryption keys R?
46. (undefined)
47. (undefined)
48. (undefined)
49. (undefined)

F-6
 Appendix F - ANSI Tables Communication

Decade 5
Decade 5 – Time and TOU Tables
Table Title Description Read /
No. Write
50. Dimension Limiting Maximum capabilities for Date & Time and TOU control
Time and Time of Use
51. Actual Time and TOU Actual capabilities for Time & Date and TOU control R
Limiting
52. Clock Real time clock R
53. Time Offset Time zone offset and DST information R
54. Calendar Schedule definition table for TOU
55. Clock State Real time clock information R?
56. Time Remaining Predictive time quantities
57. (undefined)
58. (undefined)
59. (undefined)

Decade 6
Decade 6 – Load Profile Tables
Table Title Description Read /
No. Write
60. Dimension Limiting Maximum capabilities of Load Profile
Load Profile
61. Actual Load Profile Actual Load Profile capabilities R
Limiting
62. Load Profile Control Data sources and formats used In Load Profile R
63. Load Profile Status Status of each Load Profile data set R?
64. Load Profile Data Set Load Profile data information, set 1 R
1
65. Load Profile Data Set Load Profile data information, set 2
2
66. Load Profile Data Set Load Profile data information, set 3
3
67. Load Profile Data Set Load Profile data information, set 4
4
68. (undefined)
69. (undefined)

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JEMStar User Manual

Decade 7
Decade 7 – History and Event Logs
Table Title Description Read /
No. Write
70. Limiting Log Maximum size and capabilities of History and Event Logs
Dimensions
71. Actual Log Actual size and capabilities of History and Event Logs.
Dimensions
72. Event Events supported by end device
Identification
73. History Log Defines History Log codes to be written to History Log.
Control
74. History Log Data The History Log contents
75. Event Log Control Defines Event Log codes to be written to the Event Log.
76. Event Log Data The Event Log contents
77. (undefined)
78. (undefined)
79. (undefined)

Decade 8
Decade 8 – User Defined Tables
Table Title Description Read /
No. Write
80. Dimension Maximum values and control parameters for user-defined
Function Limiting tables.
81. Actual Function Actual values and control parameters for user-defined tables.
Limiting
82. List Data elements used in the generation of user defined tables.
83. Selection Selects data elements used in user-defined tables.
84. First User Defined User defined table 1
85. Second User User defined table 2
Defined
86. Third User Defined User defined table 3
87. Fourth User User defined table 4
Defined
88. Fifth User Defined User defined table 5
89. Sixth User Defined User defined table 6

F-8
 Appendix F - ANSI Tables Communication

Decade 9
Decade 9 – Telephone Control
Table Title Description Read /
No. Write
90. Dimension Maximum dimensions for telephone control data
Telephone
Limiting
91. Actual Telephone Actual dimensions for telephone control data
Limiting
92. Global Parameters General parameters for call answer and originate
93. Originate Call originate parameters
Communication
Parameters
94. Originate Schedule Call out schedule
95. Answer Call answer parameters
Communication
Parameters
96. Call Purpose Reason for most recent call out R
97. Call status Progress of most recent calls to each phone number
98. (undefined)

99. (undefined)

F-9
JEMStar User Manual

F-10
 GLOSSARY
Apparent Power
The product of the applied voltage and current in an ac circuit. Apparent power, or volt-amperes, is not
the real power of the circuit because the power factor is not considered in the calculation. JEMStar
calculates Apparent Power = Watts 2 + VARs 2

ARO
At Rated Output

Average Power Factor

The ratio of kilowatt-hour pulses to computed equivalent kVAh pulses for the billing period.

Billing Period
The period of time (commonly a month) between readings of a meter, when those readings are used for
billing a power customer. Also, the period of time between two consecutive demand resets.

Billing Period Reset (BPR)

A task commonly associated with the Billing Read is the Billing Period Reset. The Reset causes a
"snapshot" of register readings to be copied to storage as well as clearing Peak Demand readings and
updating Cumulative and Continuous Cumulative readings. You must break a seal to perform a Billing
Period Reset on the front panel. The Reset is recorded in the Billing Period Reset event buffer.

Billing Read
A Billing Read is the task of reading billing information from the meter front panel. If the billing
information is required to be available to anyone, it can be programmed into the Normal display list (See
"Casual" Read).

Burden
Load imposed by a device on an input circuit, expressed in ohms or VA.

"Casual" Read
A "casual" read is the ability to see measurements on a sealed, functioning meter without breaking a seal
or otherwise violating the meter's security. The type and amount of information available during a casual
read can be selected by the meter setup programmer using JEMWare.
For example, any non-secure readings may be placed in the Normal display list. If nothing is to be
displayed to unauthorized users, the programmer may place the Blank or Segment Check display items in
the Normal list. Consult the JEMWare user’s manual for full configuration details.

Class; Class Amps

The maximum current for which a meter is specified to operate within its accuracy rating.

Daily Schedule
The daily schedule is an array of times and rates, and it determines the moment at which a TOU period
changes.

Demand

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JEMStar User Manual

The average of some measurement over a defined period of time, traditionally calculated by
accumulating the integrated measurement over the defined period (the "demand interval") and dividing
by the time.

Demand Deferral
A period immediately following a power outage during which demands are not calculated. It is
determined by the number of demand-interval closures following the power outage.

Demand Prediction
An optional feature that calculates and displays the Demand value expected at the end of the present
demand interval before the interval is completed. Demand Predictions may be used to monitor a load in
order to prevent setting a new Peak Demand.

Demand Reset
A scheduled or user-initiated event that causes maximum demands to be zeroed and certain other
calculations to occur.

DNP
Distributed Network Protocol: a serial communication protocol used in instrument networking. See
Appendix D.

Element
A voltage and current input pair to a meter or transducer, typically from the same phase. A half element
takes advantage of mathematical relationships present in a three phase power system to eliminate the
need for one voltage measurement.

Full Scale
A reference condition corresponding to the highest rated value of a given measurement. For watts, this
condition occurs at the user’s input voltage, class current rating, and unity power factor. For VARs, full
scale is at the user’s input voltage, class current, and zero power factor.

Health / Status Read

A Health and Status Read is concerned with evaluating the correct operation of the meter and its
installation, not its billing data. Health and Status display items may be programmed into either Normal
or Alternate display lists at the user’s discretion.

Holiday
For TOU purposes, a holiday is a date contained in the holiday schedule.

Holiday Schedule
A holiday schedule is an array of dates (in seconds time format at midnight) within the TOU schedule
that enables the meter to identify holidays.

Instantaneous Quantities
Instantaneous quantities are short-term average or RMS measurements of electrical characteristics in a
circuit. Instantaneous quantities are suitable for developing Instantaneous Register, Thermal Demand, or
analog outputs.

Integrated Quantities

G-2
 Glossary

Integrated quantities are power measurement quantities that are integrated over time, and which may be
accumulated. Integrated quantities are used for developing Consumption, Fixed or Sliding Window
Demand (Peak or Coincident), Load Profile, or pulse outputs.

Interval
A period over which a demand is calculated consisting of one or more subintervals.

IRLED
Infrared light-emitting diode, such as the optical port on the JEMStar meter.

KYZ
A meter output that indicates energy by toggling a Form-C contact output at a frequency proportional to
power flow. Each transition represents some constant amount of energy (typically referred to as Ke,
"energy constant") that has been consumed. JEMStar mimics this function by allowing the user to
configure two solid-state contact outputs into a similar arrangement.

Leading Zero(es)
The main section of the meter’s LCD readout can be configured (with JEMWare) to fill in unused
display digits with either blanks or zeros. “Leading Zeroes” inserts “0” digits to the left of the most
significant digit until all display positions are filled (there can be 6 or 8 digit positions, depending upon
user-configuration).

LLC
Line Loss Compensation: the ability of an instrument to measure or calculate the power lost in an
imperfect conductor and to use that figure to modify its power or energy readings.

Liquid Crystal Display (LCD)

Display area on the meter face that contains alpha-numeric characters for data readout.

Load Linearity
Specifies the maximum deviation of performance in percent registration over a range of current (load)
assuming all other conditions at nominal reference conditions.

Load Profile
A record of energy consumption stored periodically (typically every 1 to 60 minutes) and sequentially.
Each stored "interval" (one record) contains one or more "channels" (a single integrated quantity
accumulated during the interval just ended).

(Load Profile) Periodic Special Event

The meter stores pulses accumulated since the time of the previous LP interval closure.

Load Profile Interval

An LP interval is the period between two consecutive LP interval closures.

Load Profile Record

An LP record is the data in a segment of load-profile memory where the accumulated pulses from a
single LP interval are stored.

Loss Compensation
A generic term used to include both TLC and LLC.

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JEMStar User Manual

Measurement Quantity
A single measurable characteristic of power flow in a circuit, or a commonly used combination of
measurement quantities. E.g. Volts Phase A, Watthours Delivered Total.

MODBUS™
A standard serial communication protocol used by programmable controllers.

Null Modem
Cable that emulates a modem to enable the connection of two DTE (data terminal equipment) devices
such as any two devices that would communicate with a modem (DCE) device.

Partial Load Profile Count

The total accumulated counts within an interval after the last special event or load- profile interval
closure.

Past Interval Demand

The demand for the most recently ended demand interval.

Peak Demand
(a.k.a. Maximum Demand) The highest demand reading in a Billing Period.

Phase
The timing relationship between two signals of the same frequency, expressed as an angle. E.g. the delay
between voltage and current waveforms in an AC circuit, or between voltage waveforms in different
circuits.

One of (usually) three circuits in a polyphase power distribution system. Each phase may be treated as an
individual power source that is synchronized to the other phases in the system.

Polyphase
The sum, average, or combination (as appropriate) of measurements from all phases input to a meter.

Power Factor (PF)

The ratio of the real power (watts) to the apparent power (volt-amperes). PF is equal to the cosine of the
phase angle between voltage and current.

Present TOU Period

The one Time Of Use period that the meter determines to be active at the present time. This is
determined by the present date and time of the meter and the TOU schedule.

Pulse
A state change in either direction of a binary metering signal.

Register
Used to refer to specific quantities to be displayed or retrieved.

Register Assembly
The term used to refer to the hardware implementation of the display or control of the I/O functions of
the meter.

G-4
 Glossary

RMS
Root Mean Square: the equivalent DC value of a periodic (AC) signal. 5 amps RMS delivers the same
amount of power to a given load as 5 amps DC.

Rolling Interval/Sliding Window

A demand measurement consisting of the summation of values calculated over multiple consecutive
subintervals. A calculation is updated at the completion of each subinterval, but includes a defined
number of previous subintervals.

Season
A season is a range of dates whose start date is contained in the season schedule in seconds time format.

Season Schedule
A season schedule is an array of dates within the TOU schedule that enables the meter to identify the
seasons.

Seconds Time Format

A 32-bit number in units of seconds referenced from January 1, 1990.

Special Event
An event stored in load-profile data such as a register freeze, power fail, time set, etc.

Storage Register
A copy of a quantity which could be a displayable register and is saved when triggered by a demand
reset.

Subinterval
The increment of time in which demand calculations are updated.

TA
Test Amperes; equal to ½ Class Amps

THD
Total Harmonic Distortion: a measure of the amount of harmonic content in a periodic signal, expressed
as a percentage. A pure sine wave at the fundamental frequency has 0% THD.

Thermal Demand
A measurement filtered through a time delay such that step changes in the measurement are reflected
slowly in the output. Commonly used to simulate the effects of current heating on power distribution
equipment.

Thermal Time Characteristic

The time required for a Thermal Demand Register to reflect 90% of a step change in input. Similar to the
time characteristic of mechanical thermal demand meters.

Threshold Alarms
JEMStar can be configured to monitor any Register and (if the proper option module is installed)
generate a contact closure output based on the register's value. JEMStar compares the selected Register
against the setpoints once per second.

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JEMStar User Manual

The user can configure these characteristics:

• The register to compare against the thresholds
• The upper threshold (set point)
• The lower threshold (reset point)

Time
Time indicates hours, minutes, and seconds.

TLC
Transformer Loss Compensation: the ability of an instrument to measure or calculate the power lost in an
imperfect transformer and to use that figure to modify its power or energy readings.

Total Registers
Those JEMStar registers that are not TOU registers are called total registers. The total registers always
are active.

TOU Period
A selected duration of time during which the consumption, demand, and other information are assigned
to a set of Time Of Use registers.

TOU Rate Indicator Output

A display segment that indicates the present TOU rate in effect.

TOU Register
A TOU register is a register of the JEMStar meter that, for a designated TOU period, accumulates and
may display amounts of electrical energy, demand, or other quantities measured or calculated.

TOU Schedule
The TOU schedule is a static, externally configured database within the meter. The data base contains
information that allows the meter to determine the present TOU period based upon the real date and time
of the meter.

VA
Volt Amperes or Volt Amps: the product of voltage and current in a circuit regardless of phase.
Typically expressed in RMS units, this is also called "apparent" power. JEMStar calculates VA
vectorially.
VA = Watts 2 + VARs 2

VAh
VA hour: VA integrated over time to produce a measurement that may be accumulated.

VAR
Volt Amps Reactive: the product of voltage and current in a circuit, times the sine of the phase shift
between the two. Typically expressed in RMS units. The unit of "reactive" or "imaginary" power.

VARh
VAR hour: VAR integrated over time to produce a measurement that may be accumulated.

G-6
 Glossary

W
Watt: the product of voltage and current in a circuit, times the cosine of the phase shift between the two.
Typically expressed in RMS units. The unit of "real" power.

Wh
Watt-hour: W integrated over time to produce a measurement that may be accumulated.

G-7
PROCEDURES FOR FACTORY REPAIR AND RETURN

A. Obtain a Returned Material Authorization (RMA) number by calling the AMETEK Repair
Department and giving the following information:

1. Model and Serial Number of the equipment.

2. Failure Symptom - Be Specific
3. Approximate date of installation.
4. The site name and address of the failed equipment.
5. Complete shipping information for the return of the equipment if other than
the operating site.
6. Name and telephone number of person to contact if questions arise.

B. Enclose the information with the equipment and pack in a commercially accepted
shipping container with sufficient packing material to insure that no shipping damage will
occur. Mark the outside of the container with the RMA number.
Ship to the appropriate location:

Attention: Repair Department

AMETEK Power Instruments

255 North Union Street
Rochester, New York 14605 USA
Telephone: (888) 222-6282
Fax: (585) 238-4945

C. Your equipment will be tested, repaired, and inspected at the factory. Normal factory
turn-around is ten working days or less (excluding shipping time).

WARRANTY — AMETEK warrants equipment of its own manufacture to be free from defects in
material and workmanship, under normal conditions of use and service. AMETEK will replace
any component found to be defective, upon its return, transportation charges prepaid, within
one year of its original purchase. AMETEK will extend the same warranty protection on
accessories that is extended to AMETEK by the original manufacturer. AMETEK assumes no
responsibility, expressed or implied, beyond its obligation to replace any component involved.
Such warranty is in lieu of all other warranties expressed or implied.