Modbus RTU Relay (D)

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Modbus RTU Relay (D)
Modbus RTU Relay (D).jpg

RS485 Relay Module, Digital Input
RS485
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Overview

Electrical Safety Precautions

  • This product should be operated and used by professional electricians or technical personnel. Please ensure electrical safety measures are in place, including protection against leakage and insulation.
  • Before installing, maintaining, or replacing relay equipment, always turn off the power and unplug the plug.
  • Do not attempt to dismantle relay equipment to avoid damaging the device or risking electric shock.
  • Please properly install and place relay equipment. Avoid use in damp, overheated, or flammable environments to prevent accidents caused by improper installation or use.

This is an industrial 8-channel relay module controlled via RS485 bus, with 8-ch digital input, utilizing Modbus RTU protocol. It features embedded protection circuits such as power isolation, magnetical isolation, TVS, etc. It also comes with an ABS enclosure. The Modbus RTU Relay (D) is very easy to use. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipment and applications with high communication requirements.

Parameters

Power Supply DC 7~36V
Communication Interface RS485
Baudrate 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000
Default Communication Format 9600, N, 8, 1
Relay Channels 8 Channels
Contact Form 1NO, 1NC
Contact Load ≤10A 250V AC or ≤10A 30V DC
Digital Input 8DI, 5~36V, passive/active input (NPN or PNP), built-in bi-directional optocoupler
Modbus Protocol Standard Modbus RTU protocol
RS485 Address Setting 1~255
Indicator STA: MCU indicator, keep flashing when MCU normally working
TXD: Transmit Data indicator, lights up when sending data
RXD: Receive Data indicator, lights up when receiving data.

Primary Functions

Supports reading digital input by sending Modbus RTU protocol commands, and can control relay output based on input.
Modbus RTU Relay (D) Primary-01.png

Wiring Description

Modbus RTU Relay (D) Primary01.jpg

  • DI1-DI8 is the 8-channel signal input terminal, and DGND is the ground signal. COM is the common terminal for the input signal, it can be NC(Not Connected), connected to the positive or negative of the power supply, directly powered from the power supply or connected to an independent power supply.
  • NC: dry contact passive input.
  • Connect to the power supply positive: low active, NPN wet contact active input, voltage: 5V-30V DC.
  • Connect to the power supply negative: high active, PNP wet contact active input.

Digital Input Wiring

Modbus RTU Relay (D) Primary02.png

Passive Dry Contact Wiring

  • Passive dry contact input:

Modbus RTU Relay (D) Dry01.png

Active Wet Contact Wiring

  • Active wet contact NPN input

Modbus RTU IO 8CH Wiring Diagram02.png

  • Active wet contact PNP input

Modbus RTU IO 8CH Wiring Diagram03.png

Relay Output Wiring

The device comes with a relay with a contact capacity of 10A 250V AC or 10A 30V DC, which allows direct control of household 220V AC equipment or DC equipment up to 30V.
Modbus RTU Relay (D)Relay.png

Dimensions

Modbus RTU Relay (D)-Dim.jpg

Hardware Test

RS485 Test

  • Connect the USB TO 485 to the target board through wires, connect A-A and B-B as shown below:

Modbus RTU Relay (D)1.jpg

  • Download SSCOM and open it on the computer, open the corresponding port number, and set the baud rate as 9600. Clicking on multiple strings will open multiple string-sending windows. Clicking on the corresponding function will send the corresponding command.

Modbus-RTU-Relay-32CH-SSCOM-01.png

  • If you need to send other commands then select HEX to send, verify select ModbusCRC16 check, enter the first six bytes of the command, and click send then the CRC check code will be added automatically.
  • For detailed control commands, please see the development protocol.

Demo Test

Note: RS485 can not be directly connected to the serial port of the Raspberry Pi, otherwise it may burn the device, you need to add 485 level conversion. For Raspberry Pi, it is recommended to work with the RS485 CAN HAT module. For NUCLEO-F103RB and Arduino, it is recommended to work with the RS485 CAN Shield module.

Raspberry Pi

Open the Raspberry Pi terminal and input the following commands to enter the configuration interface.

sudo raspi-config
Select Interfacing Options -> Serial Port, select Yes to open the hardware serial port 

And then reboot the Raspberry Pi:

sudo reboot

Insert the RS485 CAN HAT into the Raspberry Pi, and connect the Modbus RTU Relay module to the RS485 CAN HAT through A and B.
If you are using other 485 devices, you need to make sure A-A, B-B.
Run the following commands:

sudo apt-get install unzip
wget https://files.waveshare.com/wiki/Modbus-RTU-Relay-(D)/Modbus_RTU_Relay_D_Code.zip
unzip Modbus_RTU_Relay_D_Code.zip
cd Modbus_RTU_IO_Code/Python3
sudo python3 main.py

After the demo normally runs, each channel can be opened and closed in order, and the current input status is displayed.

STM32

The STM32 demo is based on the NUCLEO-F103RB and RS485 CAN Shield module.
Find the STM32 demo file directory and open the STM32 project. Please note that the keil5 software is installed before use, and download the demos to the development board.
After running normally, each channel can opened and closed in order. The serial port will output the commands to be sent and finally display the current input status.

Arduino

The Arduino demo is based on the UNO PLUS and RS485 CAN Shield module.
Use the Arduino IDE to open the demo, select the corresponding development board, and download the demos.
After running normally, each channel will open and close in order. The serial port will output the commands to be sent and finally display the current input status.

Development Protocol

Function Code Introduction

Function Code Description
01 Read output status
02 Read input status
03 Read save register
05 Write single relay
06 Set single register
0F Write multiple relays
10 Set multiple registers

Register Address Introduction

Address(HEX) Address storage content Register value Permission Modbus Function Code
0x0000
……
0x0007
Channel 1~8 relay address 0xFF00: relay on
0x0000: relay off
0x5500: relay toggle
Read/Write 0x01, 0x05, 0x0F
0x00FF Control All Registers 0xFF00: all relays on
0x0000: all relays off
0x5500: all relays toggle
Write 0x05
0x0200
……
0x0207
Channel 1~8 relay flash on Interval time: data*100ms
Value: 0x0007, Interval time: 7*100MS = 700MS
Write 0x05
0x0400
……
0x0407
Channel 1~8 relay flash off Interval time: data*100ms
Value: 0x0007, Interval time: 7*100MS = 700MS
Write 0x05
1x0000
……
1x0007
Channel 1~8 input address Indicates channel 0~8 input channel status Read 0x02
4x1000
……
4x1007
Channel 1~8 relay control mode 0x0000~0x0002 control mode Read/Write 0x03, 0x06, 0x10
4x2000 UART Parameters The high eight bits indicate the parity mode: 0x00~0x02
The low eight bits indicate the baud rate mode: 0x00~0x07
Write 0x06
4x4000 Device Address Directly store Modbus address
Device address: 0x0001-0x00FF
Read/Write 0x03, 0x06
4x8000 Software Version Converting to decimal and then shifting the decimal point two places to the left will represent the software version
0x0064 = 100 = V1.00
Read 0x03

Single Relay Control

Send code: 01 05 00 00 FF 00 8C 3A

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
05 05 Command Relay control
00 00 Address The register address of relays to be controlled, 0x0000 - 0x0008
FF 00 Command 0xFF00: Relay on
0x0000: Relay off
0x5500: Relay toggle
8C 3A CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 05 00 00 FF 00 8C 3A

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
05 05 Command Relay control
00 00 Address The register address of relays to be controlled, 0x0000-0x0008
FF 00 Command 0xFF00: Relay on
0x0000: Relay off
0x5500: Relay toggle
8C 3A CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

Relay 0 on: 01 05 00 00 FF 00 8C 3A
Relay 0 off: 01 05 00 00 00 00 CD CA
Relay 1 on: 01 05 00 01 FF 00 DD FA
Relay 1 off: 01 05 00 01 00 00 9C 0A
Relay 2 on: 01 05 00 02 FF 00 2D FA
Relay 2 off: 01 05 00 02 00 00 6C 0A
Relay 3 on: 01 05 00 03 FF 00 7C 3A
Relay 3 off: 01 05 00 03 00 00 3D CA
Relay 0 toggle: 01 05 00 00 55 00 F2 9A
Relay 1 toggle: 01 05 00 01 55 00 A3 5A
Relay 2 toggle: 01 05 00 02 55 00 53 5A
Relay 3 toggle: 01 05 00 03 55 00 02 9A

Control All Relays

Send code: 01 05 00 FF FF 00 BC 0A

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
05 05 Command Relay control
00 FF Address Fixed 0x00FF
FF 00 Command 0xFF00: Relay on
0x0000: Relay off
0x5500: Relay toggle
BC 0A CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 05 00 FF FF 00 BC 0A

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
05 05 Command Relay control
00 FF Address Fixed 0x00FF
FF 00 Command 0xFF00: Relay on
0x0000: Relay off
0x5500: Relay toggle
BC 0A CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

All relays on: 01 05 00 FF FF 00 BC 0A
All relays off: 01 05 00 FF 00 00 FD FA
All relays toggle: 01 05 00 FF 55 00 C2 AA

Read Relay Status

Send code: 01 01 00 00 00 08 3D CC

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
01 01 Command Query relay status
00 00 Relay Start Address Fixed 0x0000
00 08 Relay Numbers Fixed 0x0008
3D CC CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 01 01 00 51 88

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
01 01 Command Query relay status
01 Byte Numbers Returns all bytes of the status message
00 Query Status Received relay status
Bit0: the first relay status;
Bit1: the second relay status;
Bit2: the third relay status;
……
Bit7: the eighth relay status
51 88 CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

Send: 01 01 00 00 00 08 3D CC
Receive: 01 01 01 00 51 88 //all relays off
Send: 01 01 00 00 00 08 3D CC
Receive: 01 01 01 01 90 48 //Relay 0 is on, others are off
Send: 01 01 00 00 00 08 3D CC
Receive: 01 01 01 41 91 B8 //Relay 0 and 6 are on, others are off

Write Relay Status

Send code: 01 0F 00 00 00 08 01 FF BE D5

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
0F 0F Command Write relay status
00 00 Relay Start Address Fixed 0x0000
00 08 Relay Numbers Fixed 0x0008
01 Byte Numbers Fixed 0x01
FF Relay Status Bit0: Control the first relay;
Bit1: Control the second relay;
Bit2: Control the third relay;
……
Bit7: Control the eighth relay
BE D5 CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 0F 00 00 00 01 94 0B

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
0F 0F Command Control all register
00 00 Address Fixed 0x0000
00 08 Relay Numbers Fixed 0x0008
54 0D CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

All relays on: 01 0F 00 00 00 08 01 FF BE D5
All relays off: 01 0F 00 00 00 08 01 00 FE 95
0-1 on; 3-7 off: 01 0F 00 00 00 08 01 03 BE 94

Relay Flash ON/OFF Command

Send code: 01 05 02 00 00 07 8D B0

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
05 05 Command Single control command
02 Command 02: flash on, 04: flash off
00 Relay Address The relay address to be controlled, 0x00~0x08
00 07 Interval Time The interval time: data*100ms
Value: 0x0007, Interval time: 7*100MS = 700MS
8D B0 CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 05 02 00 00 07 8D B0

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
05 05 Command Single control command
02 Command 02: flash on; 04: flash off
00 Relay Address The relay address to be controlled, 0x00~0x08
00 07 Interval time the interval time: data*100ms
Value: 0x0007, Interval time: 7*100MS = 700MS
8D B0 CRC16 The CRC16 checksum of the first 6 bytes of data

Note:

The maximum setting for the flash-on flash-off time is 0x7FFF.

For example:

[Address 1 device]:

Relay 0 flash on: 01 05 02 00 00 07 8D B0 //700MS = 7*100MS = 700MS
Relay 1 flash on: 01 05 02 01 00 08 9C 74 //800MS
Relay 0 flash off: 01 05 04 00 00 05 0C F9 //500MS
Relay 0 flash off: 01 05 04 01 00 06 1D 38 //600MS

Read Input Status

Send code: 01 02 00 00 00 08 79 CC

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address.
02 02 Command Read input status
00 00 Relay Start Address Fixed 0x0000
00 08 Register Numbers Fixed 0x0008
79 CC CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 02 01 00 A1 88

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address.
02 02 Command Read input status command
01 Relay Numbers Returns all bytes of the status message
00 Query status Return relay status
Bit0: channel 1 input status;
Bit1: channel 2 input status
Bit2: channel 3 input status
……
Bit7: channel 8 input status
A1 88 CRC16 The CRC16 checksum of the first 6 bytes of data.

For example:

[Address 1 device]:

Send: 01 02 00 00 00 08 79 CC
Receive: 01 01 01 00 51 88 //Inputs are all untriggered
Send: 01 02 00 00 00 08 79 CC
Receive: 01 02 01 01 60 48 //Channel 1 input is triggered, and the rest of channels are not triggered.
Send: 01 02 00 00 00 08 79 CC
Receive: 01 02 01 41 61 B8 //Channel 1 and 7 input are triggered, and the rest of channels are not triggered.

Read Relay Control Mode

Send code: 01 03 10 00 00 08 40 CC

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
03 03 Commad Read Holding Register
10 00 Register Start Address 0x1000 - 0x1007 corresponds to 1~8 input channels
00 08 Register Numbers Read register numbers, up to 8 channels
40 CC CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 03 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E4 59

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
03 03 Commad Read Holding Register
10 Byte Numbers Returns all bytes of the status message
00 00
……
00 00
Control Mode Indicates relay 1 - 8 control mode, 0x0000~0x0002 indicate three control modes
0x0000: Normal mode, the relay is directly controlled by commands;
0x0001: Linkage mode, relay status is the same as the corresponding input channel status;
0x0002: Toggle mode, the corresponding relay toggles once when the input channel inputs a pulse.
E4 59 CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

Read relay 1-8 control mode: 01 03 10 00 00 08 40 CC
Read relay 1 control mode: 01 03 10 00 00 01 80 CA
Read relay 2 control mode: 01 03 10 01 00 01 D1 0A
Read relay 3-5 control mode: 01 03 10 02 00 03 A0 CB

Single Relay Relay Control Mode

Send code: 01 06 10 00 00 01 4C CA

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Write single register
10 00 Register Start Address 0x1000 - 0x1007 corresponds to 1~8 input channels
00 01 Control Mode Indicates relay 1 - 8 control mode, 0x0000~0x0002 indicate three control modes
0x0000: Normal mode, the relay is directly controlled by commands;
0x0001: Linkage mode, relay status is the same as the corresponding input channel status;
0x0002: Toggle mode, input channel input a pulse corresponding to the relay state toggles once.
4C CA CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 06 10 00 00 01 4C CA

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Write single register
10 00 Register Start Address 0x1000 - 0x1007 corresponds to 1~8 input channels
00 01 Control Mode Indicates relay control mode, 0x0000~0x0002 indicate three control modes
4C CA CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

Set relay 1 as linkage mode: 01 06 10 00 00 01 4C CA
Set relay 2 as toggle mode: 01 06 10 01 00 02 5D 0B

Set Multiple Relay Control Mode

Send code: 01 10 10 00 00 08 10 00 01 00 01 00 01 00 01 00 01 00 01 00 01 00 01 7C B1

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
10 10 Command Write Multiple Register
10 00 Register Start Address 0x1000 - 0x1007 corresponds to 1~8 input channels
00 08 Register Numbers Set register numbers, up to 8 channels
10 Byte Numbers Set output bytes
00 01
……
00 01
Control Mode Indicates relay 1 - 8 control mode, 0x0000~0x0002 indicate three control modes
0x0000: Normal mode, the relay is directly controlled by commands;
0x0001: linkage mode, relay status is the same as the corresponding input channel status;
0x0002: toggle mode, input channel input a pulse corresponding to the relay state toggles once.
7C B1 CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 10 10 00 00 08 C5 0F

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
10 10 Command Write Multiple Registers
10 00 Register Start Address 0x1000 - 0x1007 Corresponds to channel 1~8 relay control mode
00 08 Register Numbers Set register numbers, up to 8 channels
C5 0F CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

Set channel 1-8 relay as linkage mode: 01 10 10 00 00 08 10 00 01 00 01 00 01 00 01 00 01 00 01 00 01 00 01 7C B1
Set channel 3-5 relay as toggle mode: 01 10 10 02 00 03 06 00 02 00 02 00 02 4A 4B

Baudrate Setting Command

Send code: 00 06 20 00 00 05 43 D8

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Set the baudrate and device address
20 00 Command Register 0x2000: set the baud rate; 0x4000: set the device address, 0x8000: read software version
00 Parity Method 0x00: no parity, 0x01: even parity; 0x02: odd parity
05 Baud Rate Value Corresponding baud rate
0x00: 4800
0x01: 9600
0x02: 19200
0x03: 38400
0x04: 57600
0x05: 115200
0x06: 128000
0x07: 256000
43 D8 CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 00 06 20 00 00 05 43 D8

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Set the baud rate and device address
20 00 Command Register 0x2000: set the baud rate, 0x4000: set the device address, 0x8000: read the software version
00 Parity Method 0x00: no parity, 0x01: odd parity, 0x02: even parity
05 Baud Rate Corresponding baud rate
0x00: 4800
0x01: 9600
0x02: 19200
0x03: 38400
0x04: 57600
0x05: 115200
0x06: 128000
0x07: 256000
43 D8 CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

Set the baudrate as 4800: 00 06 20 00 00 00 83 DB
Set the baudrate as 9600: 00 06 20 00 00 01 42 1B
Set the baudrate as 115200: 00 06 20 00 00 05 43 D8

Set the Device Address Command

Send code: 00 06 40 00 00 01 5C 1B

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Set the baud rate and device address
40 00 Command Register 0x2000: set the baudrate, 0x4000: set the device address, 0x8000: read the software version
00 01 Device Address Set the device address, 0x0001-0x00FF
5C 1B CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 00 06 40 00 00 01 5C 1B

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Set the baud rate and device address
40 00 Command Register 0x2000: set the baud rate, 0x4000: set the device address, 0x8000: read the software version
00 01 Device Address Set the device Address, 0x0001-0x00FF
5C 1B CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

Set the device address as 0x01: 00 06 40 00 00 01 5C 1b
Set the device address as 0x02: 00 06 40 00 00 02 1C 1A
Set the device address as 0x03: 00 06 40 00 00 03 DD DA

Read Device Address Command

Send code: 00 03 40 00 00 01 90 1B

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
03 03 Command Read the device address
40 00 Command Register 0x2000: set the baud rate, 0x4000: set the device address, 0x8000: read the software version
00 01 Byte Numbers Fixed 0x0001
90 1B CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 03 02 00 01 79 84

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
03 03 Command Read the software version and device address
02 Byte Numbers Return bytes
00 01 Device Address The device address to be set, 0x0001-0x00FF
79 84 CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[Address 1 device]:

Send: 00 03 40 00 00 01 90 1B
Receive: 01 03 02 00 01 79 84 //Address: 0x01
[Address 2 device]:

Send: 00 03 40 00 00 01 90 1B
Receive: 02 03 02 00 02 7D 85 //Address: 0x02
[Address 3 device]:

Send: 00 03 40 00 00 01 90 1B
Receive: 03 03 02 00 03 81 85 //Address: 0x03

Read Software Version Command

Send code: 00 03 80 00 00 01 AC 1B

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
03 03 Command Read the software version and device address
80 00 Command Register 0x2000: set the baud rate, 0x4000: set the device address, 0x8000: read the software version
00 01 Byte Numbers Fixed 0x0001
8F CA CRC16 The CRC16 checksum of the first 6 bytes of data

Receive code: 01 03 02 00 64 B9 AF

Field Description Note
01 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
03 03 Command Read the software version and device address
02 Byte Numbers Received Byte Numbers
00 64 Software version Converting to decimal and shifting the decimal point two places to the left indicates the software version.
0x0064=100=V1.00
F0 B8 CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

Send: 00 03 80 00 00 01 AC 1B
Receive: 03 03 02 00 C8 F1 00 //0x00C8 = 200 =V2.00

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