Modbus RTU Relay

From Waveshare Wiki
Jump to: navigation, search
Modbus RTU Relay
Modbus RTU Relay

Industrial Modbus RTU 8-ch Relay Module, RS485 Bus, Multi Protection
{{{name2}}}

{{{name3}}}

{{{name4}}}

{{{name5}}}

Primary Attribute
Category:
{{{userDefinedInfo}}}: {{{userdefinedvalue}}}
Brand: Waveshare
Website
International: Website
Chinese: 中文网站
Onboard Interfaces
RS485
Related Products

Overview

This is an industrial 8-ch relay module controlled via RS485 bus, utilizing Modbus RTU protocol. It features embedded protection circuits such as power isolation, ADI magnetical isolation, and TVS diode, etc. It also comes with an ABS enclosure.

The Modbus RTU Relay is very easy to use. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipments and/or applications with high communication requirements.

Hardware testing

  • Connect USB to 485 moduble to Modbus RTU Relay board by wires. Connect A to A and B to B. Then connect the USB to 485 module to your PC
Modbus-RTU-Relay connet.jpg
  • Download the SSCOM software and Open it in your PC. Select the correct COM port (according to Devices Manager), set baud rate to 9600. Click Extension and send the commands to test
Modbus-RTU-Relay-2.png

If you want to send other commands, please check HEX option and choose ModbusCRC16 parity. Input the commands and send.

Modbus-RTU-Relay-3.png

For more details of the commands, please refero Protocol Manual of Modbus RTU Relay

Examples

Raspberry Pi

Enable Serial port
  • Open terminal of Raspberry Pi
  • Run the following command to configure
sudo raspi-config
  • Choose Interfacing Options -> Serial -> No -> Yes
  • Then reboot Raspberry Pi
sudo reboot
Hardware connection

You need to connect and RS485 devices to Raspberry Pi (the demo codes provided is based on our RS485 CAN HAT), Connect Modbus RTU Relay module to the RS485 CAN HAT, A to A and B to B.

Run example

Use the following commands to run the demo codes

wget https://www.waveshare.com/w/upload/f/f9/Modbus_RTU_Relay_Code.zip
unzip Modbus_RTU_Relay_Code.zip
cd Modbus_RTU_Relay_Code/Python3
sudo python3 main.py

STM32

The Demo codes for STM32 is based on NULCEO-F103RB and RS485 CAN Shield module

Download the #demo codes and open the STM32 project by Keil software.

Program the codes to NUCLEO board

The codes will run and toggle the relay in turn.

Arduino

The Arduino demo is based on Waveshare UNO Plus and RS485 CAN Shield

Open Arduino project and program it to the UNO board.

The codes will run and toggle the relay in turn.

Resources

Demo codes

Softwares

Supports

Please contact us by Email/Skype/WeChat for technology support.Our response may be delay, you can just leave your questions, we will reply to you as soon as possible in working time.

Service email.png [email protected]
Service skype.png [email protected]
Service wechat.png Webchat Linzeru.png
Service time.png 09:00 - 18:00 (UTC+8 Monday to Staturday)