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Operating Manual

Din Rail Mountable Digital Load Cell

Transmitter

RW-GT01D

REV 1601A CHS

RW-GT01D 1
Catalog Brief Introduction

Content Page

Brief Introduction....................................................................................................1  Industrial standard din rail mounting

Dimension................................................................................................................2  24 digit high accuracy AD converter and high-speed microprocessor
 Internal digital filter and strong anti-interference ability
Wiring.........................................................................................................................2  RS232 or RS485 interface, supporting standard MODBUS RTU
Technical Data........................................................................................................2 communication protocol
Communication Protocol.....................................................................................2  Excellent temperature stability

Communication Example ....................................................................4  Application: all the bridge stain gauge load cells for weighing, tension,
compression, torque, etc.
Common Problem Detection and Solution.....................................................5
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Dimension (mm) Wiring Notice:
1. When wiring, please disconnect power supply of transmitter.
37 57.5 2. Transmitter wiring terminal is plug. To connect easily, please connect
cable and terminal plug first, and then plug into socket of transmitter. Please
do not plug in a wrong place. It is better to use pin-type cold-pressed
terminal to keep reliability of connection.
3. Please use special shielded wire for load cell wiring and do not bind it
115 with AC power supply. Connect load cell cable shielded layer to terminal 12
and connect it to the ground.

Technical Data

1. Overall precision: 0.1±2digit%%F.S.

Wiring 2. Resolution: >50000 Digit
3. Load Cell Sensitivity: 0.8-3.9mV/V
No. Code Description
4. Interface: RS232/RS485 (notice when order)
1 24+ DC24Vpower+
5. Power Supply: 24VDC
2 0V DC24Vpower-
6. Load Cell Excitation Voltage: 5-12V
3 TX/A RS232:data transmitting TX, RS485:D+/A
7. Temperature Coefficient: better than 100ppm
4 RX/B RS232:data receiving RX, RS485:D-/B
5 COM communication Common(not connect usually)
8. Power: <1W (1pc 350Ω load cell)
6 E+ load cell Excitation voltage+ 9. Working Environment: -30 to 85℃, 85%RH
7 F+ load cell feedback+
10. Enclosure Material: ABS
8 S+ load cell signal output+ 11. Net Weight:76g
9 S- load cell signal output-
10 F- load cell feedback- Communication Protocol
11 E- load cell Excitation voltage-
12 SLD load cell cable shielded layer & transmitter ground 1. Byte Format:
9600bps, 1 start bit, 8 data bits, no odd/even check, 1 stop bit, communication
Note: when wiring, please disconnect all the equipments' power rate and calibration bit revisable
supplies at both sides of communication terminal.
2. Default address 01, supporting address range 1-254. Address 0 is
Excitation E- Excitation E- broadcast address. Please do not use broadcast address, if parallel
Feedback F- Feedback F- connection more than (include two) two transmitters on same RS485 bus.
Signal S- Signal S-
All the operation of host towards transmitter can be done by revising holding
SLD SLD
register.
Signal S+ Signal S+ See attached table 1.
Feedback F+ Feedback F+
Excitation E+ Excitation E+
load cell 4 wiring connection load cell 6-wiring connection
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Table 1: Transmitter Parameter and MODBUS Holding Register

000A-000B 40011-40012 R/W

000C-000D 40013-40014 R/W
000E-000F 40015-40016 R/W
0010-0011 40017-40018 R/W
0012-0013 40019-40020 R/W
AVP7 40021-40022 R/W 32-bit integer
0016-0017 40023-40024 R/W
AVP9 0018-0019 40025-40026 32-bit integer
001A-001B 40027-40028 R/W
001C-001D 40029-40030 R/W
001E-001F 40031-40032 R/W
0020-0021 40033-40034 R/W
0022-0023 40035-40036 R/W
0024-0025 40037-40038 R/W
0026-0027 40039-40040 R/W
0028-0029 40041-40042 R/W
002A-002B 40043-40044 R/W
0034-0035 40053-40054 R/W
0056-0057 40087-40088 R/W
0058-0059 40089-40090 R/W
005A-005B 40091-40092 R/W
005C-005D 40093-40094 R/W
005E-005F 40095-40096 R/W
0060-0061 40097-40098 R/W
0062-0063 40099-40100 R/W
0064-0065 40101-40102 R/W
0066-0067 40103-40104 R/W
AD Code 1F40-1F41 48001-48002 RO 32-bit ieteger AD value without calibration
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Responsive message from transmitter:
Table 2: Baud Rate Setting Value Table 3: Parity Bit Setting Value 01 10 00 02 00 02 E0 08 (slave address: 01, function: 10, write 2
consecutive holding register from 0002, the last is CRC calibration code)
3. Clear: write measured value register 0 directly. If need to show other
value, please write the corresponding value to make display presetting.
1 However, please note that this operation could not save zero value in the
2
inner part of transmitter, when power up next time, it will return to original set
value.
3
4 Query Message from Host:
01 10 00 00 00 02 04 00 00 00 00 F3 AF ( slave address:01, function: 10,
write 2 consecutive holding register from 0000, total data bytes: 4, set
6
displayed value 0, the last is CRC calibration code)

8 Responsive Message from transmitter:

9 01 10 00 00 00 02 41 C8 (slave address: 01, function 10, write 2 consecutive
holding register from 0000, the last is CRC calibration code).

4. Zero setting: Two ways

Communication Example The First Way: First read present displayed value, and then write it into
transmitter zero point register. Please note that do not make clear before this
1. Read measured value: use function code 03 to read holding register. operation. Writing zero tracing value 0 is used for factory testing. So we
Register No. of measured value is 0000-0001(40001-40002), Length is 4 suggest using clear function, so as not to shorten service life of inner part of
byte signed long integer. Dimension is related with calibration. For example, transmitter
if load cell range is 800kg, and calibration is 800000, which means the data The Second Way:
read is actual measured value, and unit is g. If calibration is 80000, the value Host sending:
unit read is 0.01kg. This transmitter does not support decimal point. 01 05 00 0A FF 00 AC 38 (slave address:01, function code: 05, coil address:
000A, writing address value:FF00, calibration code: AC38)
Query message from Host:
01 03 00 00 00 02 C4 0B (slave address: 01, function 03, read 2 consecutive 5. MODBUS Command Calibration
holding register from 0000, the last is CRC calibration code) We suggest using transmitter as AD module, and make calibration
Responsive message from transmitter: calculation on host. Please check below methods to make transmitter
01 03 04 00 01 05 E2 28 EA (slave address: 01, function: 03, responsive 4 calibration through MODBUS command.
byte data: 00 01 05 E2, which means decimal 67042, that is, measured value  Weighing nothing, read AD code 32 times (register 1F40-1F41), get
is 67042, the last is CRC calibration code) average value, write it into AVP1 and write 0 for PVP1
2. Setting transmitter device address: use function code 10 to write many  For standard loading, read AD code 32 times (register 1F40-1F41), get
holding register. For example: the original device address is 01, need to average value, write it into AVP2, write standard load value for PVP2. Please
revise to 10. note that this value decides (affect) resolution of transmitter. For example, if
standard load is 10kg and need resolution to show 1g, 10000 must be wrote.
Query message from Host:  If write calibration point 2, calibration is finished.
01 10 00 02 00 02 04 00 00 00 0A F2 71 (slave address is 01, function:10,  If need to make multi-calibration, make standard load incremented
write 2 consecutive holing register from 0002, total data bytes:4, new repeatedly, read AD code, write into corresponding register and revise
address 10 is changed to 32-byte hex 00 00 00 0A, the last is CRC register value of calibration point.
calibration code)
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Common Problem Detection and Solution
Solution

*This manual final interpretation belongs to Shanghai Tianhe Automation Co., Ltd.
*Version changes without prior notice

Manufacturer: Shanghai Tianhe Automation Instrumentation Co., Ltd.

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