USBC-H-422_485 - M PRO or - ISO PRO

Series Serial Adapter

Data Sheet
Document Reference No.: CP_000078

Version 1.1

The USBC-H-422/485-M PRO or -ISO PRO, provides a simple method of adapting legacy serial
devices with RS422 or RS485 interfaces to modern USB ports by incorporating the FTDI FT232H
bridge chip. The ISO version features optical isolation to protect against electrical spikes and surges.

A power supply output of +5VDC @ up to 250mA is available on the 6-pin terminal block
connector. Indicator LEDs provide functional status.

Connective Peripherals Pte Ltd

178 Paya Lebar Road, #07-03 Singapore 409030
Tel.: +65 67430980 Fax: +65 68416071

E-Mail (Support): support@connectiveperipherals.com Web: www.connectiveperipherals.com/products

Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted, or reproduced
in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are
supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Connective
Peripherals Pte Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory
rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device, or system in which the
failure of the product might reasonably be expected to result in personal injury. This document provides preliminary information that
may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of
this document. Connective Peripherals Pte Ltd, 178 Paya Lebar Road, #07-03 Singapore 409030. Registered Number: 201617872E

Copyright © Connective Peripherals Pte Ltd

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Table of Contents
1 Introduction .................................................................... 4
1.1 Functional Description .............................................................. 4
1.2 LED Description......................................................................... 5
1.3 Features .................................................................................... 5
1.4 Performance Figures ................................................................. 6
1.5 Ordering Information ................................................................ 6
2 Installation ..................................................................... 7
2.1 Example Applications and Configurations ................................. 7
2.1.1 Hardware Installation ................................................................................. 7
2.1.2 Mounting .................................................................................................. 7
2.1.3 Wiring and Connection ............................................................................... 8

2.2 Device Driver Installation ......................................................... 9

2.3 Configuration Via Software ....................................................... 9
2.3.1 Configuration via software for Windows (GUI) ..............................................10
2.3.2 Configuration via software for Windows (Command Line) ..............................13
2.3.3 Configuration via software for Linux (GUI) ...................................................14
2.3.4 Configuration via software for Linux (Command Line) ...................................14

3 Electrical details ............................................................ 15

3.1 USB Electrical Parameter ........................................................ 15
3.2 RS422/RS485 ......................................................................... 15
3.3 Power Output .......................................................................... 16
4 Setting Recommendations ............................................ 17
4.1 Data Transfer Rates versus Distance ...................................... 17
4.2 Extra Fail-Safe (EFS) ............................................................... 17
4.3 120ohm Terminator (T120) .................................................... 17
4.4 Grounding connection ............................................................. 18
4.4.1 USBC-H-422/485-M PRO (Non-Isolated Version) ..........................................18
4.4.2 USBC-H-422/485-M-ISO PRO (Isolated Version)...........................................18

5 Physical Environment Details ........................................ 19

5.1 Storage Temperature .............................................................. 19
5.2 Operating Temparature........................................................... 19
6 Environmental Approvals & Declarations ...................... 20

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6.1 EMI Compatibility.................................................................... 20

6.2 Safety ..................................................................................... 20
6.3 Reliability ................................................................................ 20
6.4 Import / Export Information .................................................. 20
7 Troubleshooting ............................................................ 21
7.1 Hardware ................................................................................ 21
7.2 Device Driver .......................................................................... 21
7.3 Technical Support ................................................................... 22
8 Contact Information ...................................................... 23
Appendix A - List of Figures and Tables ............................. 24
List of Figures ................................................................................. 24
List of Tables ................................................................................... 24
Appendix B - Revision History ............................................ 25

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1 Introduction
1.1 Functional Description
The USBC-H-422/485-M PRO and -ISO PRO provide a simple method of adapting legacy serial devices
with RS422 or RS485 interfaces to modern USB ports. This is accomplished by incorporating the industry
standard FTDI FT232H USB-Serial bridge chip which is USB 2.0 Hi-Speed (480Mbits/Second) and Full
Speed (12Mbits/Second) compatible.

The PRO series edition is extremely flexible and allows the user to configure the serial interface mode
selection and the operating settings entirely via a software utility tool instead of using DIP switches and
jumpers.

Besides the RS422 or RS485 mode (mutually exclusive) configurable selection, there are total of 4
configurable selections based on the communication standard which are (i) Termination (120 Ω); (ii)
Slew Rate (for enhanced distance and EMI emissions); (iii) Echo (only available for RS485 interface
mode) and (iv) Extra-Fail-Safe mode (EFS, by enabling the bias resistors). All of these settings as well as
data transmission traffic are visually confirmed by LED indication. It is possible to configure the serial
port for data communication up to 3M baud rate with Slew Rate set to OFF.

It is recommended to utilise USBC-H-422/485-M-ISO PRO for applications where the devices need to be
placed in a different building or in the same building but using a different power supply system. This is to
protect the devices from the large lightning spikes & electric shock as well as to suppress any harmful
electric noise.

Flexible mounting allows the USBC-H-422/485-M PRO or -ISO PRO to be used in a variety of applications,
from a portable adapter to accompany a laptop to permanent installations in industrial, commercial, and
retail locations. The USBC-H-422/485-M PRO or -ISO PRO serial adapter’s electronic circuit board is
mounted inside a metal enclosure which provides improved isolation performance as well as a more
robust ESD protection.

The USBC-H-422/485-M PRO or -ISO PRO adapter requires USB device drivers, available free from
http://www.ftdichip.com/Drivers/VCP.htm or https://connectiveperipherals.com/pages/resources, which
allow the USBC-H-422/485-M PRO or -ISO PRO to appear as a Virtual COM Port (VCP). This allows
existing serial communications software, such as Tera Term, to exchange data through the USBC-H-
422/485-M PRO or -ISO PRO adapter to a legacy RS422/RS485 peripheral device.

Pin 5 of the terminal block connector can provide +5V DC power output with maximum 250mA.

Figure 1-1 - USBC-H-422/485-M PRO or -ISO PRO adapter

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1.2 LED Description

The USBC-H-422/485-M PRO or -ISO PRO has a total of 10 LEDs to indicate power, configurable mode
selection as well as data traffic according to the following table:

LED Label LED Colour Function Description

ON when device is in normal operation mode & flashes
Operation Mode
CONFIG Green twice per second when it is in configuration programming
Indication
mode.
RXD Activity Flashes when device is receiving the data from the
RXD Orange
Indication attached RS422/RS485 peripheral device.
TXD Activity Flashes when device is transmitting data to the attached
TXD Red
Indication RS422/RS485 peripheral device.
RS422 Mode
RS422 Green ON when device is in RS422 operation mode.
Indication
RS485 Mode
RS485 Green ON when device is in RS485 operation mode.
Indication
ON when ECHO mode is enabled; device is in RS485
ECHO Mode operation mode & receiving the same data as the
ECHO Green
Indication transmitting data. OFF when ECHO mode is disabled, and
the data transmitted is not received by RS485.
ON when there is a 120Ω termination resistor between
Data+ (A) & Data- (B) signals line for RS485; or between
Termination
T120 Green TXD+ & TXD-; RXD+ & RXD-; CTS#+ & CTS#- as well as
Indication
RTS#+ & RTS#- for RS422. OFF when 120Ω line
termination is disabled.
ON when slew rate control is enabled on the device,
device can only transmit the data by RS422/RS485 up to
SLEW Green Slew Rate Indication
250k baud. OFF when slew rate control is disabled and
device can transmit the data up to 3M baud.
ON when Extra-Fail-Safe mode is enabled whereby
additional 750R pull-up and pull-down resistors are
EFS Green EFS mode Indication
applied on the positive and negative differential lines,
respectively. OFF when Extra-Fail-Safe mode is disabled.
For USBC-H-422/485-M PRO adapter, it is ON when 5V
output power is stable. While for USBC-H-422/485-M-ISO
PRO adapter, this LED indicates the power generation
5V Output Power
IPWR Green condition from the isolated 5V DC-DC converter power
Indication
line; it will be ON normally, but if it is OFF, this indicates
a failure in the DC-DC converter due to overload or
component failure.
Table 1.1 – LED Description
1.3 Features
• Adds a high-speed RS422/485 serial port by connecting to USB
• Reversible USB type C connector ensures an excellent user experience.
• Easy plug & installation for RS422/RS485 device connection
• Works with USB 1.1, 2.0 & 3.0 Host and Hub ports
• Industry Standard FTDI chip set & device drivers for maximum compatibility
• Microsoft Windows® WHQL-certified, macOS, Linux and Windows CE device drivers
• Installs as a standard Windows COM port
• COM port number can be changed to any available COM port number, to support HyperTerminal,
or any other serial communications software application running in Windows
• RS-485 data signals: A (Data+), B (Data-), GND
• RS-422 data signals: TXD-, TXD+, RXD+, RXD-, GND, RTS#-, RTS#+, CTS#+, CTS#-
• Powered by USB port. No external power adapter required.
• Pin 5 of terminal block connector can provide +5VDC output at 250mA
• Serial port speed up to 3Mbps
• Serial Communication Parameters
o Data bits: 7, 8
o Parity: None, Even, Odd, Mark, Space
o Stop bits: 1, 2

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o Flow control: None, RTS/CTS

• One 6-pin terminal block connector, two RJ45 connectors for RS485 serial communication and
one DE-9P male connector for RS422/RS485 serial communication
• Clear LED indication of USB Data Traffic & configuration mode setting for monitoring port status &
easy diagnostics
• Metal enclosure
• Operating temperature of 0°C to +70°C
• For USBC-H-422/485-M-ISO PRO, the RS422/485 port is optically isolated with 3kV DC optical
isolation
• RS422/RS485 terminals are protected by surge protector to withstand electrostatic discharge and
power surges up to ±25KV ESD
• UKCA, FCC and CE compliant.

1.4 Performance Figures

Parameter Performance
USB Interface USB 2.0 High Speed & full Speed compatible, USB 1.1 compliant
Standard Windows baud rates (300bps to 921.6Kbps)
Custom baud rates (300bps to 3Mbps) through baud rate aliasing. See
RS422/RS485 Interface
FTDI Application Note: https://ftdichip.com/wp-
content/uploads/2020/08/AN_120_Aliasing_VCP_Baud_Rates.pdf
Table 1.2 - Performance Figures

1.5 Ordering Information

Part Number Description
High Speed USB compatible with USB type C receptacle
USBC-H-422/485-M PRO
connector to RS422/RS485; NON-Isolation version serial adapter
High Speed USB compatible with USB type C receptacle
USBC-H-422/485-M-ISO PRO
connector to RS422/RS485; Isolation version serial adapter
Table 1.3 - Ordering Information
Note: For both 2 models the follow accessories we provide:
USB2.0 standard A to USB Type-C cable (2meters) * 1;
35mm Din Rail Bracket(L=35mm) * 1;
Screw M2.5*6mm * 2.

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2 Installation
2.1 Example Applications and Configurations
2.1.1 Hardware Installation

There are no switches or jumpers to configure on the USBC-H-422/485-M PRO or -ISO PRO.

Figure 2-1 - USBC-H-422/485-M PRO or -ISO PRO’s key component description

2.1.2 Mounting

The USBC-H-422/485-M PRO or -ISO PRO is provided with a 35mm standard DIN rail mount option. The
DIN rail mount allows the USBC-H-422/485-M PRO or -ISO PRO to be permanently mounted to a wall or
attached to a DIN rail.

Figure 2-2 - USBC-H-422/485-M PRO or -ISO PRO’s Mounting

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2.1.3 Wiring and Connection

The USBC-H-422/485-M PRO or -ISO PRO device is a downstream USB 2.0 High Speed Device. A
standard USB Type “C” receptacle is mounted inside the USBC-H-422/485-M PRO or -ISO PRO device to
facilitate connection to an upstream USB Host or Hub. Note: If a USB Hub is used, be sure it is “Self-
Powered” with its own PSU, as the bus powered hub may not have enough current to supply to the
device.

Insert the A-plug into an available USB Host or Hub port while insert the C-plug into the C-receptacle on
the USBC-H-422/485-M PRO or -ISO PRO. Below table shows the pinout for the USB type C-receptacle
connector.

Mating
Pin Number Signal Name Description
Sequence
A1 GND First USB Ground
B1 GND First USB Ground
A4 VBUS First USB 5V Power provided from upstream USB Host or Hub
B4 VBUS First USB 5V Power provided from upstream USB Host or Hub
A5 CC1 Second CC line; shorted to ground through 5.1kohm
B5 CC2 Second CC line; shorted to ground through 5.1kohm
A6 DP1 Second Data + for USB data signals
B6 DP2 Second Data + for USB data signals
A7 DN1 Second Data - for USB data signals
B7 DN2 Second Data - for USB data signals
A8 SBU1 (N.C.) Second No connection
B8 SBU2 (N.C.) Second No connection
A9 VBUS First USB 5V Power provided from upstream USB Host or Hub
B9 VBUS First USB 5V Power provided from upstream USB Host or Hub
A12 GND First USB Ground
B12 GND First USB Ground
Shield Shield (USB type C metal mating part); is shorted to
Case Ground First
ground
Table 2.1 - USB Type "C" Receptacle Pinout

Besides the USB C-receptacle, there are total 4 connectors; 1x terminal block connector, 1x DE-9P
connector and 2x RJ45 connectors to be connected to RS422/RS485 devices.

Note: To avoid any unwanted issues, disconnect all RS485 devices from the USBC-H-422/485-M PRO or -
ISO PRO when operating in RS422 mode and vice versa.

The terminal block connector is suitable for wire ended cable and the following table shows the pinout for
the terminal block connector.

Pin Signal Name Type Description

1 B/TXD- Bi-Direction for RS485 B (Data –) for RS485 or TXD- for RS422
or Output for RS422
2 A/TXD+ Bi-Direction for RS485 A (Data +) for RS485 or TXD+ for RS422
or Output for RS422
3 RXD+ Input for RS422 RXD+ for RS422 or leave unconnected for RS485
4 RXD- Input for RS422 RXD- for RS422 or leave unconnected for RS485
5 VOUT_5V Output 5V DC Power Supply Output @ 250mA max; it is
isolated 5V output if for USBC-H-422/485-M-ISO
PRO
6 GND GND Ground or isolated ground; it is isolated ground if
for USBC-H-422/485-M-ISO PRO
Table 2.2 - Terminal block connector pin assignment

DE-9P connector is compatible for the connection with RS422 or RS485 devices and the following table
shows the pinout for the DE-9P connector.

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Pin Signal Name Type Description

1 B/TXD- Bi-Direction for RS485 B (Data –) for RS485 or TXD- for RS422
or Output for RS422
2 A/TXD+ Bi-Direction for RS485 A (Data +) for RS485 or TXD+ for RS422
or Output for RS422
3 RXD+ Input RXD+ for RS422
4 RXD- Input RXD- for RS422
5 GND GND Ground or isolated ground(See note)
6 RTS#- Output RTS#- for RS422
7 RTS#+ Output RTS#+ for RS422
8 CTS#+ Input CTS#+ for RS422
9 CTS#- Input CTS#- for RS422
Table 2.3 - DE-9P connector pin assignment

Note: Pin-5 is isolated ground for USBC-H-422/485-M-ISO PRO. If application required a VOUT_5V power
supply output for the device and required no CTS/RTS handshake, customised versions of this also
available. Users interested in customised versions of this should contact Connective Peripherals Sales -
sales@connectiveperipherals.com.

2xRJ45 connectors are suitable for the connection with RS485 devices including DMX512 and the
following table shows the pinout for the RJ45 connectors.

Pin Signal Name Type Description

1 Data+ (A) Bi-Direction Data + for RS485
2 Data- (B) Bi-Direction Data - for RS485
3 N.C. N.A. No connection
4 N.C. N.A. No connection
5 N.C. N.A. No connection
6 N.C. N.A. No connection
7 GND GND Ground or isolated ground; it is isolated ground if
for USBC-H-422/485-M-ISO PRO.
8 GND GND Ground or isolated ground; it is isolated ground if
for USBC-H-422/485-M-ISO PRO.
Table 2.4 - RJ45 connectors' pin assignment

2.2 Device Driver Installation

The USBC-H-422/485-M PRO or -ISO PRO adapter drivers are available for download from:
https://connectiveperipherals.com/pages/resources .

For driver installation instructions, please refer to the Connective Peripherals USB to Serial
Converters Driver Installation Guide (CP_000084) which can see from here :
https://cdn.shopify.com/s/files/1/0434/1376/6295/files/USB_to_Serial_Converters_Driver_Installation_G
uide.pdf.

2.3 Configuration Via Software

A free configuration utility is provided to change the configuration via software for Windows and Linux OS
download from https://connectiveperipherals.com/pages/resources. Make sure to close all the operating
applications for USBC-H-422/485-M PRO or -ISO PRO adapter before start to do configuration. To enter
the configuration mode, press the Configure Switch Button until you see the CONFIG LED flashing. Then
open up the CP Configuration Utility.exe and click the “Scan” button to search for the connected USBC-H-
422/485-M PRO or -ISO PRO devices.
Note:
1. On Windows the utility will use the FTDI D2XX DLL automatically. The DLL is installed when the driver
for an FTDI device is installed by Windows Update. Please disable the “VCP” driver before running the
configuration utility, after config the device please enable the “VCP” to use the serial port. Follow
below step to disable & enable the “VCP”:

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Device Manager ->Universal Serial Bus Controllers/USB Serial Converter/Properties ->Disable the
“VCP.”

2. On Linux, the library for D2XX (libftd2xx) must be installed manually. The install package in
downloaded from the FTDI website. It is necessary to remove the ftdi_sio kernel module before using
the utility as per the instruction in the library package.

2.3.1 Configuration via software for Windows (GUI)

Figure 2-3 – CP Configuration Utility’s diagram (GUI)

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All the connected USBC-H-422/485-M PRO or -ISO PRO devices will appear with their Serial Number in
the COM Port dropdown list. Then select the desired device from the dropdown list to “Retrieve” the
configuration setting data or “Update” the configuration setting data after finishing setting the
configuration.

Note: The Configuration Utility is based on the serial number to config the device, please confirm the
serial number showed in the Utility is the device you want to configure one.

To update the configuration setting data, check the box for the desired configuration selection, after that,
click the “Update button,” if it is updated successfully then you will see a prompt out message as below –

Figure 2-4 - CP Configuration Utility's “Successfully updated…” prompt out message

If the device fails to update the configuration settings data, then you will see a prompt out message as
below.

Note:
1. Please kindly check whether the device was connected to another terminal, if yes please disconnect it
and try again.
2. Please kindly check whether the device in configuration mode by checking the CONFIG LED flashing
condition, if it is not in configuration mode, then please press the Configure Switch Button to enter
into configuration mode.

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Figure 2-5 - CP Configuration Utility's “Update failed” prompt out message

Besides that, you may use the CP Configuration Utility to read out the current operating configuration
setting data by pressing “Retrieve” button whilst the device is in configuration mode. Below is the prompt
out message to indicate it has retrieved data successfully.

Figure 2-6 - CP Configuration Utility's “Read Successfully” prompt out message

If it has failed to retrieve the configuration setting data, then you will see a prompt out message as
below.

Note:
1. Please kindly check whether the device was connected to another terminal, if yes please disconnect
it and try again.
2. Please kindly check whether the device in configuration mode by checking the CONFIG LED flashing
condition, if it is not in configuration mode, then please press the Configure Switch Button to enter
into configuration mode.

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Figure 2-7 - CP Configuration Utility's “Read failed” prompt out message

It will remain in configuration mode after reading out the operating configuration data, so you may
continue to update the configuration data using the check boxes to select the configuration parameter
and then press “Update” button. If you would like to exit from this configuration mode, close the CP
Configuration Utility and then unplug & plug in the USB cable to power cycle & reset the device in order
to operate the device in normal operation mode.

2.3.2 Configuration via software for Windows (Command Line)

Locate to the Configuration Utility folder and run the CPConfig.exe file for details of the Command Line.

Figure 2-8 - CP Configuration Utility diagram (Command Line)

All the connected USBC-H-422/485-M PRO or -ISO PRO devices will appear with their Serial Number in
the COM Port dropdown list. Can use “.\CPConfig.exe -l” to list all the connected devices. Then you can
use the config commands to set the device.

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Figure 2-9 - CP Configuration Utility's “Device list” output message

To update the configuration setting data, please follow the command examples as below:

Figure 2-10 - CP Configuration Utility's Command Format example

if it is updated successfully then you will see a message as below:

Figure 2-11- CP Configuration Utility's “Update Successfully” output message

If the device fails to update the configuration settings data, then you will see a message as below –

Figure 2-12- CP Configuration Utility's “Update Failed” output message

Note: Please kindly check whether the device is in configuration mode by checking the CONFIG LED
flashing condition, if it is not in configuration mode, then please press the Configure Switch Button to
enter into configuration mode.

2.3.3 Configuration via software for Linux (GUI)

Please refer to 2.3.1 Configuration via software for Windows (GUI)

2.3.4 Configuration via software for Linux (Command Line)

Please refer to 2.3.2 Configuration via software for Windows (CMD)

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3 Electrical details
3.1 USB Electrical Parameter
Parameter Description Minimum Typical Maximum Units Conditions
*Present when USB cable is
Input Power
USB_VCC 4.75 5.0 5.25 V attached, and USB Host or
Voltage*
Hub powered.
For USBC-H-422/485-M PRO;
without 250mA external load
- 70 500 mA
connected at terminal block
connector
For USBC-H-422/485-M PRO;
with 250mA external load
- 320 500 mA
connected at terminal block
connector
Icc USB current
For USBC-H-422/485-M-ISO
PRO; without 250mA
- 180 500 mA
external load connected at
terminal block connector
For USBC-H-422/485-M-ISO
PRO; with 250mA external
- 430 500 mA
load connected at terminal
block connector
Table 3.1 - USB Electrical Details

3.2 RS422/RS485
Parameter Description Minimum Typical Maximum Units Conditions
Receiver Input
VCM Common-mode input -7 +12 V
voltage range
IN Input Current 125 VIN = +12V
µA
-100 VIN = -7V
Differential
VTH Threshold -0.2 +0.2 V
Voltage, VTH
VIHYST Input Hysteresis 25 mV
Input Resistance,
RIN 96 125 kΩ
RIN
Transmitter Output
Differential Output 1.5 VOUT_5V V R = 27Ω (RS485)
VOD Voltage, R = 50Ω (RS422)
dVOD 2.0 VOUT_5V V
ESD Tolerance
RS422/RS485 Inputs
ESD HBM ±25 kV
and Outputs
EN61000-4- RS422/RS485 Inputs
±25 kV
2ContactDischarge and Outputs
EN61000-4- RS422/RS485 Inputs
±25 kV
2AirGapDischarge and Outputs
Table 3.2 – RS422/RS485 Electrical Details

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3.3 Power Output

The USBC-H-422/485-M PRO or -ISO PRO assigns pin 5 of the 6-pin terminal block connector to provide
+5V DC for an external device that requires power. The maximum allowable current that can be supplied
from the USB bus is 500mA, including the circuitry of the USBC-H-422/485-M PRO or -ISO PRO itself, so
up to 250mA may be used by the external device.

Parameter Description Minimum Typical Maximum Units Conditions

For USBC-H-422/485-M
PRO; The range is
4.25 5.0 5.25 V dependent on the USB port
that the serial adapter is
Output Power connected to.
VOUT_5V
Voltage For USBC-H-422/485-M-
ISO PRO; This is a DCDC
4.25 5.0 5.5 V output voltage, the
maximum DC voltage may
be up to 5.5V.
**Overloading by drawing
Output Power more than 250mA may
Iout 0 250** mA
Current cause the device to
malfunction.
Table 3.3 - Power Output Option

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4 Setting Recommendations
This section will share the basic knowledge about RS422 and RS485’s communication standard and the
critical feature setting recommendations for the USBC-H-422/485-M PRO & USBC-H-422/485-M-ISO PRO
to avoid errors during data transmission. As a user-friendly product, USBC-H-422/485-M PRO and USBC-
H-422/485-M-ISO PRO have been designed with built-in features and configuration utility to make
termination and failsafe easy to set without opening the unit or adding external resistors.

4.1 Data Transfer Rates versus Distance

USBC-H-422/485-M PRO & USBC-H-422/485-M-ISO PRO USB to RS422/RS485 serial adapters are
suitable for long distance data communication up to 1200m with data rates at a maximum of 250kbps.
For a connection up to 1200m, it is recommended to connect up to 4 devices if they operate with the
data rates of 9600bps while up to 3 devices can be connected if they operate with a data rate of
250kbps. Besides that, for those applications required to operate under the highest data transfer rates of
3Mbps, it is recommended to connect up to a maximum of 300m with a maximum of 3 devices in a daisy
chain. Nevertheless, for the application which is operating with data transfer rates less than 250kbps, it is
recommended to always turn ON the Slew Rate setting as this will minimize the EMI emission as well as
mitigate the adverse effects of imperfect transmission line termination which may be caused by stubs or
mismatched cables.

4.2 Extra Fail-Safe (EFS)

The standard extra fail-safe (EFS) biasing is used to maintain the data bus in a known state (at logic
high) when the bus in idle state (Tri-state; Hi-impedance, OFF). This is especially important for a Multi-
Point application. It is recommended to always enable the EFS function for USBC-H-422/485-M PRO &
USBC-H-422/485-M-ISO PRO devices as their drivers are switchable, always enabling the EFS function
can prevent data errors occurring during the data transmission.

4.3 120ohm Terminator (T120)

The terminating 120ohm resistor across the differential data lines is used to match the nominal
characteristic impedance of the data bus cabling so that the receiver at the end of the bus can see the
maximum signal power & minimize the signal reflection as well as optimize the signal integrity. For an
RS485 application, it is recommended to turn on the 120ohm terminator on the first device and last
device among the devices connected in daisy chain (both ends of the daisy chain connection).

Figure 4-1 - Recommendation for 120ohm Terminator setting during RS485 communication
with multipoint connection

For an RS422 application, typically it will be a point-to-point connection, and hence it is recommended to
turn on the 120ohm terminator on the receiver side only for point-to-point connection.

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Figure 4-2 - Recommendation for 120ohm Terminator setting during RS422 communication
with point-to-point connection

4.4 Grounding connection

The Connective Peripherals USB-C to RS422/RS485 High speed serial adapters are high speed USB to
RS422 or RS485 serial adapter devices. Due to the cost issues, some users may try to avoid utilising an
extra wire (GND). Hence, this section attempts to explain the design options available for grounding
connections of RS422/RS485 data communication systems based on these versions. The first being a
Non-Isolated designed while the second includes a complete galvanic isolated design between the USB
ports and the RS422/RS485 peripheral devices.

4.4.1 USBC-H-422/485-M PRO (Non-Isolated Version)

There is no specific requirement for a grounding wire between the devices (USBC-H-422/485-M PRO) if
they are in the same functional area and sharing the same power supply system. This is because these
devices eventually will have the signal return through the identical system earth grounding wire and
hence, the grounding’s potential should be very low. Besides that, the USBC-H-422/485-M PRO includes
internal surge protection at the RS422 & RS485 terminals which are able to divert the common mode
surges to ground.

4.4.2 USBC-H-422/485-M-ISO PRO (Isolated Version)

For those applications where the devices are to be placed in different buildings or in the same building
but using the different power supply systems, it is recommended to use the isolated USBC-H-422/485-M-
ISO PRO in the application. If the devices are not connected to the same metal system grounding, there
is a requirement to have a grounding wire connected between the devices. In a case where there is no
grounding wire connected between RS422 or RS485 terminal, there is a very high probability that some
data corruption or miscommunication many occur, especially during a lightning storm as the ground
potential developed between the devices becomes significant.

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5 Physical Environment Details

5.1 Storage Temperature
Parameter Description Minimum Typical Maximum Units Conditions
Storage Temperature
T -20 +75 o
C
Range
Table 5.1 - Storage Temperature

5.2 Operating Temparature

Parameter Description Minimum Typical Maximum Units Conditions
Operating Temperature
T 0 +70 o
C
Range
Table 5.2 - Operating Temperature

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6 Environmental Approvals & Declarations

6.1 EMI Compatibility
UKCA, FCC and CE

The USBC-H-422/485-M PRO or -ISO PRO has been tested to be compliant with UKCA, FCC Part 15
Subpart B and European EMC Directive.

NOTE: This is a Class B product. In a domestic environment, this product may cause radio interference,
in which case the user may be required to take adequate measures.

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.

6.2 Safety
The USBC-H-422/485-M PRO or -ISO PRO is defined as Limited Power Supply (LPS) device, with
operating voltages under 60VDC.

6.3 Reliability
The USBC-H-422/485-M PRO or -ISO PRO is designed as a robust USB-Serial adapter for use in many
environments. There are no user-serviceable parts. Any failure will require a replacement of the unit.

6.4 Import / Export Information

Import / Export Information
Country of Origin China
Harmonized
8542.90.0000
System Code
Product Description USB2.0 Type C High Speed to RS422/RS485 serial adapter (Isolated or Non-Isolated
version)
USA ECCN EAR99 – No License Required
Table 6.1 - Import / Export Information

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7 Troubleshooting
7.1 Hardware
Cables are the most common sources of trouble with external devices.

Check the following:

- USB cable supported USB2.0 high speed is required & it should be able to sync the data at 480Mbps
transfer speed.
- USB cable is properly inserted at both ends
- Computer power is ON
- Computer is not in Sleep or Standby
- If a USB Hub is used, be sure it is set for “Self-Powered” operation
- If a USB Hub is used, be sure all cables are properly inserted
- If all the above are OK, the PWR LED should be lit, indicating the device has been powered up and
ready for communication.

RS485 cables – check the following:

- Check for specific handshake requirements of your RS485 peripheral.

- Because there are no handshake signals, ensure the application is set to “No Hardware Handshake,”
or equivalent.

RS422 cables – check the following:

- Check for specific handshake requirements of your RS422 peripheral.

- Because there are either “None” or RTS/CTS handshake signal could be selected for RS422 mode,
ensure the application is set to “None” handshake or “RTS/CTS” handshake or equivalent.

7.2 Device Driver

Ensure the latest device driver is in use. See http://www.ftdichip.com/Drivers/VCP.htm.

If other devices with FTDI chips are installed in the system, check with all manufacturers of these devices
for the latest device drivers.

See the FTDI installation guides for additional details: http://ftdichip.com/Documents/InstallGuides.htm

Common Windows Device Driver Troubles:

• DEVICE TIMES OUT: The default settings of the device driver assume typical data transfers of
hundreds to thousands or more bytes at a given time. Some applications, such as a GPS device,
only send data in short packets, often only a few bytes. If this is the case, it may be necessary
to adjust the driver’s buffer size and/or latency timer to smaller values. These values can be
adjusted through the Advanced driver options (see FTDI AN_107). The buffer size can be reduced
to 64 bytes. The latency timer can be set as low as 2ms. A setting of 1ms will cause unnecessary
USB traffic and could adversely affect data transmission.
• ERRATIC MOUSE POINTER: The device driver defaults to query an attached device to find out
whether it is a mouse or modem, consistent with native COM port operation. Some RS485
peripherals constantly send short packets of data, causing the host system to “think” a mouse or
modem has been attached. These short packets will interfere with normal mouse operation
causing the pointer to jump around the screen. If this happens, disconnect the RS485 device and
uncheck the Serial Enumerator option, also found on the Advanced Driver Options (see FTDI
AN_107).
• COM PORT IN USE: Windows keeps track of all COM port assignments. If multiple products have
been connected to a single system, the COM port number will increase, even if the other devices
are not attached. If the higher COM port assignments are not acceptable for the application,
known unused COM port numbers should be uninstalled according to the FTDI installation guide:
http://ftdichip.com/Documents/InstallGuides.htm.

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7.3 Technical Support

Technical support may be obtained from your nearest Connective Peripherals office. See details below.

E-Mail (Support): support@connectiveperipherals.com

Web: http://www.connectiveperipherals.com/products

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8 Contact Information
Global Headquarters – Singapore

Connective Peripherals Pte Ltd

178 Paya Lebar Road
#07-03
Singapore 409030

Tel: +65 67430980

Fax: +65 68416071

E-Mail (Sales) sales@connectiveperipherals.com

E-Mail (Support) support@connectiveperipherals.com
Web Site URL http://www.connectiveperipherals.com
Web Shop URL http://www.connectiveperipherals.com

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Appendix A - List of Figures and Tables

List of Figures
Figure 1-1 - USBC-H-422/485-M PRO or -ISO PRO adapter ................................................................ 4
Figure 2-1 - USBC-H-422/485-M PRO or -ISO PRO’s key component description ................................... 7
Figure 2-2 - USBC-H-422/485-M PRO or -ISO PRO’s Mounting ........................................................... 7
Figure 2-3 – CP Configuration Utility’s diagram (GUI) ...................................................................... 10
Figure 2-4 - CP Configuration Utility's “Successfully updated…” prompt out message ........................... 11
Figure 2-5 - CP Configuration Utility's “Update failed” prompt out message ........................................ 12
Figure 2-6 - CP Configuration Utility's “Read Successfully” prompt out message ................................. 12
Figure 2-7 - CP Configuration Utility's “Read failed” prompt out message ........................................... 13
Figure 2-8 - CP Configuration Utility diagram (Command Line) ......................................................... 13
Figure 2-9 - CP Configuration Utility's “Device list” output message .................................................. 14
Figure 2-10 - CP Configuration Utility's Command Format example .................................................. 14
Figure 2-11- CP Configuration Utility's “Update Successfully” output message .................................... 14
Figure 2-12- CP Configuration Utility's “Update Failed” output message ............................................. 14
Figure 4-1 - Recommendation for 120ohm Terminator setting during RS485 communication with
multipoint connection .................................................................................................................. 17
Figure 4-2 - Recommendation for 120ohm Terminator setting during RS422 communication with point-to-
point connection ......................................................................................................................... 18

List of Tables
Table 1.1 – LED Description ........................................................................................................... 5
Table 1.2 - Performance Figures ..................................................................................................... 6
Table 1.3 - Ordering Information .................................................................................................... 6
Table 2.1 - USB Type "C" Receptacle Pinout ..................................................................................... 8
Table 2.2 - Terminal block connector pin assignment ........................................................................ 8
Table 2.3 - DE-9P connector pin assignment .................................................................................... 9
Table 2.4 - RJ45 connectors' pin assignment .................................................................................... 9
Table 3.1 - USB Electrical Details .................................................................................................. 15
Table 3.2 – RS422/RS485 Electrical Details .................................................................................... 15
Table 3.3 - Power Output Option .................................................................................................. 16
Table 5.1 - Storage Temperature .................................................................................................. 19
Table 5.2 - Operating Temperature ............................................................................................... 19
Table 6.1 - Import / Export Information ........................................................................................ 20

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Appendix B - Revision History

Revision Changes Date

1.0 Initial release 03-08-2022

1.1 Updated utility Instructions (GUI & Command Line) 04-11-2022

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