Demo

• Demo code

Software

• Sscom5.13.1_for_Modbus_RTU_Relay_16CH

Hardware Test

RS485

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

• Download Sscom5.13.1_for_Modbus_RTU_Relay_16CH and open it on the PC, open the corresponding port, and set the baud rate as 9600. Clicking on multiple strings opens multiple string-sending windows. Clicking on the corresponding function will send the corresponding command.
• If you need to send other commands, select "HEX" as the sending format and choose "Modbus CRC16" as the checksum. When entering the command, if the first six bytes are provided and you click on "Send," the CRC checksum will be automatically added.

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

Demo Test

Note: RS485 cannot be directly connected to the Raspberry Pi's serial port as it may damage the devices. It requires a level converter for RS485. It is recommended to use an RS485 CAN HAT module with the Raspberry Pi. For NUCLEO-F103RB and Arduino, it is recommended to use an RS485 CAN Shield module.

Raspberry Pi

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

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

And then reboot the Raspberry Pi:

sudo reboot

Open /boot/config.txt file, and find the following configure sentence to enable the serial ports. 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 needs to be removed.

#dtoverlay=pi3-miniuart-bt

And then reboot the Raspberry Pi:

sudo reboot

If you want to insert the RS485 CAN HAT into the Raspberry Pi, connect the A and B ports of the Modbus RTU Relay module and the RS485 CAN HAT module.
If you use other 485 devices, you need to make sure A-A and B-B.
Run the following commands:

sudo apt-get install unzip
wget https://www.waveshare.com/w/upload/f/f0/Modbus_RTU_Relay_16CH_Code.zip
unzip Modbus_RTU_Relay_16CH_Code.zip
cd Modbus_RTU_Relay_16CH_Code/Python3
sudo python3 main.py

SRM32

The STM32 demos are based on the NUCLEO-F103RB and the RS485 CAN Shield module.
Find the STM32 program file directory and open the STM32 project. Note that before using the computer to ensure that the keil5 software has been installed, download the program to the development board can be downloaded.
Normal operation of the relay module will turn on and then turn off in turn. The serial port will output the command sent.

Arduino

The Arduino demos are based on the NUO PLUS and RS485 CAN Shield modules.
Use Arduino IDE to open the program, select the corresponding development board and then download the program.
The relay module will turn on and then turn off in order to run normally. The serial port will output the commands sent.

Development Protocol

Function Code Introduction

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

Control All Relays

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

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

For example:

[No. 1 address 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 flip: 01 05 00 FF 55 00 C2 AA

Read the Relay Status

Sending code: 01 01 00 00 00 10 3D C6

Return code: 01 01 02 00 00 B9 FC

For example:

[NO.1 address device]

Send: 01 01 00 00 00 08 3D CC
Return: 01 01 02 00 00 B9 FC //All relays off
Send: 01 01 00 00 00 08 3D CC
Return: 01 01 02 00 01 78 3C //Relay 0 is on, the rest of the relays are off.
Send: 01 01 00 00 00 08 3D CC
Return: 01 01 02 00 41 79 CC //Relays 0 and 6 are on, the rest are off

Write Relay Status

Sending code: 01 0F 00 00 00 10 02 FF FF E3 90

Return code: 01 0F 00 00 00 10 54 07

For example:

[No.1 address device]

All relays on: 01 0F 00 00 00 10 02 FF FF E3 90
All relays off: 01 0F 00 00 00 10 02 00 00 E2 20
0-1 ON; 3-15 OFF: 01 0F 00 00 00 10 02 00 03 A2 21

Relay Flash On and Flash Off Command

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

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

Note:

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

For example:

[No.1 address device]

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

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

Set the Device Address Comand

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]

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

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

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

Read Software Version Command

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

Return code: 01 03 02 00 64 B9 AF

For example:

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

Demo

• Demo code

Software

• Sscom5.13.1_for_Modbus_RTU_Relay_16CH

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