Demo

• Demo

Software

• SSCOM

Hardware Test

RS485 Test

• Connect USB TO 485 and the target board with cables, and connect A --> A and B --> B as shown below:

• 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.

• If you need to send other commands then select HEX 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.

• For detailed control commands, please see the development protocol.

Demo Test

Note: RS485 cannot be directly connected to the serial port of the Raspberry Pi, as it may damage the device. A 485-level converter is required. It is recommended to use the Raspberry Pi with an RS485 CAN HAT module. For NUCLEO-F103RB and Arduino, it is recommended to use an RS485 CAN Shield module.

Raspberry Pi

Open the terminal of the Raspberry Pi, and input the following commands to enter the configure interface:

sudo raspi-config
Choose Interfacing Options -> Serial, disable shell visit, open the hardware serial port 

And then reboot the Raspberry Pi:

sudo reboot

Open /boot/config.txt file, and find the following configure sentences to enable the serial port. If there is none, you can add it at the end of the file:

enable_uart=1

For Raspberry Pi 3B users, the serial port is for Bluetooth, and you need to comment it out.

#dtoverlay=pi3-miniuart-bt

And then reboot the Raspberry Pi:

sudo reboot

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

sudo apt-get install unzip
wget https://www.waveshare.com/w/upload/7/74/Modbus_RTU_Relay_32CH_Code.zip
unzip Modbus_RTU_Relay_32CH_Code.zip
cd Modbus_RTU_Relay_32CH_Code/Python3
sudo python3 main.py

STM32

The STM32 demo is based on the NUCLEO-F103RB and the RS485 CAN Shield module.
Find the STM32 demo file directory and open the STM32 project. Make sure the keil5 software is installed on your computer before use, and download the demo to the development board.
Normal operation on the relay module will open and then close sequentially. The serial port will output the sent command.

Arduino

The Arduino demo is based on NUO PLUS and RS485 CAN Shield module.
Use Arduino IDE to open the demo and choose the corresponding development board to download the demo.
Normal operation on the relay module will open and then close sequentially. The serial port will output the sent command.

Development Protocol

Function Code

Single Relay Control

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

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

For example: [NO. 1 address device]:
NO. 0 relay on: 01 05 00 00 FF 00 8C 3A
NO. 0 relay off: 01 05 00 00 00 00 CD CA
NO. 1 relay on: 01 05 00 01 FF 00 DD FA
NO. 1 relay off: 01 05 00 01 00 00 9C 0A
NO. 2 relay on: 01 05 00 02 FF 00 2D FA
NO. 2 relay off: 01 05 00 02 00 00 6C 0A
NO. 3 relay on: 01 05 00 03 FF 00 7C 3A
NO. 3 relay off: 01 05 00 03 00 00 3D CA
NO. 0 relay flip: 01 05 00 00 55 00 F2 9A
NO. 1 relay flip: 01 05 00 01 55 00 A3 5A
NO. 2 relay flip: 01 05 00 02 55 00 53 5A
NO. 3 relay flip: 01 05 00 03 55 00 02 9A

Read Relay Status

Sending code: 01 01 00 00 00 20 3D D2

Return code: 01 01 04 00 00 00 00 FB D1

For example:

[NO.1 address device]

Send: 01 01 00 00 00 20 3D D2
Return: 01 01 04 00 00 00 00 FB D1 //All relays off
Send: 01 01 00 00 00 20 3D D2
Return: 01 01 04 00 00 00 01 3A 11 //NO.0 relay on, others off
Send: 01 01 00 00 00 20 3D D2
Return: 01 01 04 00 00 00 41 3B E1 //NO.0 and NO.6 relays on, others off

Write Relay Status

Sending code: 01 0F 00 00 00 20 04 FF FF FF FF C5 1C

Return code: 01 0F 00 00 00 20 54 13

For example:

[No. 1 address device]

All relays on: 01 0F 00 00 00 20 04 FF FF FF FF C5 1C
All relays off: 01 0F 00 00 00 20 04 00 00 00 00 C4 88
0-1 on; 3-15 off: 01 0F 00 00 00 20 04 00 00 00 03 84 89

Relay Flash On Flash Off Command

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

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

Remarks:

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

For example:

[NO.1 address device]

NO.0 relay flash on: 01 05 02 00 00 07 8D B0 //700MS = 7*100MS = 700MS
NO.1 relay flash on: 01 05 02 01 00 08 9C 74 //800MS
NO.0 relay flash off: 01 05 04 00 00 05 0C F9 //500MS
NO.1 relay flash off: 01 05 04 01 00 06 1D 38 //600MS

Baudrate Setting Command

Sending code: 00 06 20 00 00 05 43 D8

Return code: 00 06 20 00 00 05 43 D8

For example:

[NO.1 address 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

Device Address Setting Command

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

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

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

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

Return code: 01 03 02 00 01 79 84

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 the Software Version Command

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

Return code: 01 03 02 00 64 B9 AF

For example:

Send: 00 03 80 00 00 01 AC 1B
Return: 01 03 02 00 64 B9 AF //0x0064 = 100 =V1.00

Demo

• Demo

Software

• SSCOM

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