Modbus RTU IO 8CH

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Modbus RTU IO 8CH
Modbus RTU IO 8CH.jpg

RS485 DI/DO Midule
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 product is an industrial-grade RS485 interface controlled 8DI / 8DO digital isolated input-output module. It supports passive input/active input, utilizes Modbus RTU protocol, and includes built-in protection circuits such as power isolation, optocoupler isolation, self-resetting fuses and TVS.

Specification

Communication Interface RS485
Baud Rate 4800, 9600, 19200, 38400, 57600
115200, 128000, 256000
Default Communication Format 9600, N, 8, 1
Modbus Protocol Standard Modbus RTU Protocol
Power Supply DC 7~36V
Digital Input 8DI, 5~36V, passive input/active input (NPN or PNP)
Built-in bidirectional optocoupler
Digital output 8DO, 5~40V, open-drain output, output load 500mA/channel(MAX)
Set the device address range 1~255 (1 by default, corresponds to the hexadecimal value of 0x01

Basic Function

Supports reading digital input by sending Modbus RTU protocol commands via RS485 for digital output control.
Modbus RTU IO 8CH Primary.jpg

Wiring Introduction

Hardware Wiring Introduction

Modbus RTU IO 8CH Hard.jpg

Wiring Table
Channel Label Function Channel Label Function
7~36V Power Supply Positive 485 A+ RS485 Signal Wire A
GND Power Supply Negative 485 B- RS485 Signal Wire B
NC Not Connected EARTH RS485 shielding ground wire
DGND Signal Ground DGND Signal Ground
DI1 The input terminal of the first channel DO1 The output terminal of the first channel
DI2 The input terminal of the second channel DO2 The output terminal of the second channel
DI3 The input terminal of the third channel DO3 The output terminal of the third channel
DI4 The input terminal of the fourth channel DO4 The output terminal of the fourth channel
DI5 The input terminal of the fifth channel DO5 The output terminal of the fifth channel
DI6 The input terminal of the sixth channel DO6 The output terminal of the sixth channel
DI7 The input terminal of the seventh channel DO7 The output terminal of the seventh channel
DI8 The input terminal of the eighth channel DO8 The output terminal of the eighth channel
DI COM[1] the common terminal for input signals DO COM[2] the common terminal for output signals
  1. DI COM serves as the common terminal for input signals, capable of being not connected or connected to either the positive or negative pole of the power supply. It can directly draw power from the power supply or have an independent power source.
    • Not connected: Dry contact passive input.
    • Connected to the positive pole of the power supply: low-level active, NPN type wet contact active input, voltage 5V-36V DC.
    • Connected to the negative pole of the power supply: High-level active, PNP type wet contact active input, voltage 5V-36V DC.
      Modbus-RTU-IO-8CH-DI-connection.png
  2. DO COM is the common terminal for output signals, connect to the positive pole of the output power.
    • Modbus-RTU-IO-8CH-DO-connection.png

Digital Input Wiring

The digital input wiring types: passive dry contact input, active wet contact NPN input, active wet contact PNP input.

Digital Input Wiring Diagram

  • Passive dry contact input wiring diagram:

Modbus RTU IO 8CH Wiring Diagram01.jpg

  • Active wet contact NPN input wiring diagram:

Modbus RTU IO 8CH Wiring Diagram02.png

  • Active wet contact PNP input wiring diagram:

Modbus RTU IO 8CH Wiring Diagram03.png

Digital Output Wiring

  • Digital output wiring diagram:

Modbus-RTU-IO-8CH-DO-connection.png

Dimensions

Modbus RTU IO 8CH dimen.jpg

Hardware Test

RS485 Test

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

Modbus RTU IO 8CH Test01.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 window. Clicking on the corresponding function will send the corresponding command.
  • If you need to send other commands then select HEX to send, plus check select ModbusCRC16 checksum, enter the first six bytes of the command, and click send then the CRC checksum will be added automatically.

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

  • 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 the device may be burned. The 485 voltage translator is required, and Raspberry Pi is recommended to work with RS485 CAN HAT module, NUCLEO-F103RB and Arduino are recommended to use with 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 to connect A-A, B-B.
Run the following commands:

sudo apt-get install unzip
wget https://files.waveshare.com/wiki/Modbus-RTU-IO-8CH/Modbus_RTU_IO_Code.zip
unzip Modbus_RTU_IO_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 the reserved register
05 Write a single output channel
06 Set a single register
0F Write multiple output channels
10 Set multiple registers

Register Address Introduction

Address (HEX) Address storage content Register value Permission Modbus Function Code
0x0000
……
0x0007
Output channel 1~8 address 0xFF00: open;
0x0000: close
0x5500: flip
Read/Write 0x01,0x05,0x0F
0x00FF Control all registers 0xFF00: open all output
0x0000: close all output
0x5500: flip all output
Write 0x05
0x0200
……
0x0207
Output channel 1~8 flash on Interval time: data*100ms
Value: 0x0007, Interval time: 7*100MS = 700MS
Write 0x05
0x0400
……
0x0407
Output channel 1~8 flash off Interval time: data*100ms
Value: 0x0007, Interval time: 7*100MS = 700MS
Write 0x05
1x0000
……
1x0007
Input channel 1~8 address Indicates 0~8 input channel status Read 0x02
4x1000
……
4x1007
Ouput channel 1~8 control mode 0x0000~0x0002 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

Control Single Output Channel

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

Field Description Description
01 Device address 0x00 indicates the broadcast address; 0x01-0xFF indicates the device address
05 05 Command Write a single output channel
00 00 Address The register address to control the output channels: 0x0000 - 0x0008
FF 00 Command 0xFF00: on;
0x0000: off;
0x5500: flip
8C 3A CRC16 The CRC16 checksum of the first 6 bytes of data

Return 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 Commadn Write a single output channel
00 00 Address The register address to control the output channels: 0x0000-0x0008
FF 00 Command 0xFF00: on
0x0000: off
0x5500: flip
8C 3A CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[No.1 Address Device]:

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

All Output Channel Control

Sending 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 Write a single output channel command
00 FF Address Fixed 0x00FF
FF 00 Command 0xFF00: on;
0x0000: off;
0x5500: flip
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 Write a single output channel command
00 FF Address Fixed 0x00FF
FF 00 Command 0xFF00: on;
0x0000: off
0x5500: flip
BC 0A CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[No.1 Address Device]:

Open all output channels: 01 05 00 FF FF 00 BC 0A
Close all output channels: 01 05 00 FF 00 00 FD FA
Flip all output channels: 01 05 00 FF 55 00 C2 AA

Read Output Channel Status

Sending 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 the output channel status command
00 00 The initial address of the output channel Fixed 0x0000
00 08 Number of output channels 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 the output channel status command
01 Bytes Returns all bytes of the status message
00 Query status Returned output channel status
Bit0: the first output channel status
Bit1: the second output channel status
Bit2: the third output channel status
……
Bit7: the eighth output channel status
51 88 CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[No.1 Address Device]

Send: 01 01 00 00 00 08 3D CC
Receive: 01 01 01 00 51 88 //Close all output channels
Send: 01 01 00 00 00 08 3D CC
Receive: 01 01 01 01 90 48 //Open output channel 0 and close other output channels
Send: 01 01 00 00 00 08 3D CC
Receive: 01 01 01 41 91 B8 //Open output channel 0 and output channel 6, close other output channels

Write the Output Channel 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 the output channel status command
00 00 The initial address of the output channel Fixed 0x0000
00 08 Number of output channels Fixed 0x0008
01 Byte numbers Fixed 0x01
FF Output channel status Bit0: control the first output channel
Bit1: control the second output channel
Bit2: control the third output channel
……
Bit7: control the eighth output channel
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 registers command
00 00 Output channel address Fixed 0x0000
00 08 Number of output channels Fixed 0x0008
54 0D CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[No.1 Address Device]

Open all output channels: 01 0F 00 00 00 08 01 FF BE D5
Close all output channels: 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

Output Channel 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 Output channel address The output channel address to be controled: 0x00~0x08
00 07 Interval time 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 Output channel address The output channel address to be controled: 0x00~0x08
00 07 Interval time 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:

[No.1 device address]

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

Read Input Channel 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 the input status command
00 00 The initial address of the input Fixed 0x0000
00 08 Number of Registers 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 the input status command
01 Byte number Returns all bytes of the status message
00 Query status Returned input channel status
Bit0: the first channel input status;
Bit1: the second input channel status
Bit2: the third input channel status
……
Bit7: the eighth input channel status
A1 88 CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[NO.1 address device]

Send: 01 02 00 00 00 08 79 CC
Receive: 01 02 01 00 A1 88 //Inputs are all untriggered
Send: 01 02 00 00 00 08 79 CC
Receive: 01 02 01 01 60 48 //Channel 1 input triggered, remaining channels not triggered
Send: 01 02 00 00 00 08 79 CC
Receive: 01 02 01 41 61 B8 //Channel 1, 7 input triggered, remaining channels not triggered

Read Output Channel 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 Command Read the holding register
10 00 The initial address of the register 0x1000 - 0x1007 corresponds to the channel 1~8 output
00 08 Number of Registers Read the number of registers, 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 Command Read the holding register
10 Byte Numbers Returns all bytes of the status message
00 00
……
00 00
Control Mode Indicates channel 1~8 output control mode, 0x0000~0x0002 indicates three control modes
0x0000: Normal mode, the output channel is directly controlled by the command;
0x0001: Linkage mode, the state of the output channel is the same as the state of the corresponding input channel;
0x0002: Flip mode, Input channel input a pulse corresponding to the output channel state flipped once.
E4 59 CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[NO.1 address device]

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

Set Single Output Channel 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 a single register command
10 00 The initial address of the register 0x1000 - 0x1007 corresponds to channel 1~8 output channel control mode
00 01 Control Mode Indicates channel 1~8 output control mode, 0x0000~0x0002 indicates three control modes
0x0000: Normal mode, the output channel is directly controlled by the command;
0x0001: Linkage mode, the state of the output channel is the same as the state of the corresponding input channel;
0x0002: Flip mode, Input channel input a pulse corresponding to the output channel state flipped 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 a single register command
10 00 The initial address of the register 0x1000 - 0x1007 corresponds to channel 1~8 output control mode
00 01 Control Mode Output channel control mode, 0x0000~0x0002 indicates three control modes
4C CA CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[NO.1 address device]

Set channel 1 output as the linkage mode: 01 06 10 00 00 01 4C CA
Set channel 2 output as the flip mode: 01 06 10 01 00 02 5D 0B

Set Multiple Output Channel 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 registers command
10 00 The initial address of the register 0x1000 - 0x1007 corresponds to channel 1~8 output control mode
00 08 Number of Registers Set the number of registers, up to 8 channels
10 Byte numbers Sets the number of output bytes
00 01
……
00 01
Control Mode Indicates channel 1~8 output control mode, 0x0000~0x0002 indicates three control modes
0x0000: Normal mode, the output channel is directly controlled by the command;
0x0001: Linkage mode, the state of the output channel is the same as the state of the corresponding input channel;
0x0002: flip mode, input channel input a pulse corresponding to the output channel state flipped 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 command
10 00 The initial address of the register 0x1000 - 0x1007 corresponds to channel 1~8 output control mode
00 08 Number of registers Set the number of registers, up to 8 channels
C5 0F CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[NO.1 address device]

Set channel 1-8 output as the 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 output as the flip mode: 01 10 10 02 00 03 06 00 02 00 02 00 02 4A 4B

Set Baud Rate Command

Send code: 00 06 20 00 00 05 43 D8

Field Description Note
00 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Set the baud rate and the device address
20 00 Command Register 0x2000: set the baud rate, 0x4000L: set the device address, 0x8000: read the software version
00 Parity Method 0x00: no parity, 0x01: even-parity, 0x02: odd-parity
05 Baud rate Baud rate numerical corresponding
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
00 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Set the baud rate and the 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: even-parity, 0x02: odd-parity
05 Baud rate Baud rate numerical corresponding
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:

[NO.1 address device]

Set the baud rate as 4800: 00 06 20 00 00 00 83 DB
Set the baud rate as 9600: 00 06 20 00 00 01 42 1B
Set the baud rate 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
00 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Set the baud rate and the 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

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

Field Description Note
00 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
06 06 Command Set the baud rate and the 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:

[No.1 address 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 the Device Address Command

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

Field Description Note
00 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
03 03 Command Read the device address command
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
00 Device Address 0x00 indicates the broadcast address, 0x01-0xFF indicates the device address
03 03 Command Read the software version, read the device address command
02 Byte Numbers Number of bytes returned
00 01 Device Address Set the device address, 0x0001-0x00FF
79 84 CRC16 The CRC16 checksum of the first 6 bytes of data

For example:

[No.1 address device]

Send: 00 03 40 00 00 01 90 1B
Return: 01 03 02 00 01 79 84 //Address 0x01
[No.2 address device]

Send: 00 03 40 00 00 01 90 1B
Return: 02 03 02 00 02 7D 85 //Address 0x02
[No.3 address device]

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

Read Software Version

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 the 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 the device address
02 Byte Numbers Returned 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

Resource

Program

Software

FAQ

 Answer:
Note: This tutorial is only applicable to hardware versions labeled with "V03 QC. (Versions shipped after June 2024.)"

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