Waveshare Modbus RTU 32-Channel Relay Board RS485 Communication Module with Isolation Protection for Industrial Control Systems

Description:

The Waveshare Modbus RTU 32-Channel Relay Module is a robust industrial-grade relay control solution designed for reliable performance in automation and remote control systems. Communicating via the RS485 interface and using the Modbus RTU protocol, this module ensures seamless integration with PLCs, SCADA systems, and other industrial controllers.

Built with multiple isolation protection circuits—including power supply isolation, magnetic isolation, resettable fuse, and TVS diode—it offers superior protection against electrical surges and interference. Housed in a durable ABS enclosure, the module is engineered for long-term deployment in demanding environments.

With high-speed, stable, and secure communication, this 32-channel relay board is perfect for industrial automation, distributed control systems, smart energy solutions, and any application requiring safe, efficient, and scalable relay control.

Specification:

• Operating voltage: 7~36V
  
• Communication interface: RS485
  
• baudrate: 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000
  
• Default communication format: 9600, N, 8, 1
  
• Relay channels: 32
  
• Contact form: 1NO 1NC
  
• Contact rating: ≤10A 250VAC/30VDC
  
• Communication protocol: Standard Modbus RTU protocol
  
• RS485 address: 1~255
  
• LED indicators:
                    STA: MCU indicator keeps flashing when the MCU is normally working
                    TXD: TX indicator, lights up when sending data
                    RXD: RX indicator, lights up when receiving data
  

Features:

• Configurable device address (1~255); multiple devices can be cascaded on the RS485 bus
• Features flash-on, flash-off function. It is possible to turn on the relay for a while and then close it automatically via the command
• Onboard voltage regulator chip, supports 7~36V wide voltage power supply
• Onboard unibody power supply isolation provides a stable isolated voltage and needs no extra power supply for the isolated terminal
• Onboard unibody magnetic isolation allows signal isolation, high reliability, strong anti-interference, and low power consumption
• Onboard resettable fuse and TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, provides over-current/over-voltage proof, lightningproof & anti-electrostatic
• Onboard Optocoupler isolation prevents the relay from being interfered with by high-voltage circuits
• Onboard dedicated relay driver chip, with built-in freewheeling diode protection, the driving ability is stronger and more stable
• Reverse-proof circuit prevents the circuit from being damaged accidentally by incorrect connection
• High quality relay, contact rating: ≤10A 250VAC/30VDC
• Rail-mounted ABS case, easy to install, safe to use
• 3 LEDs for indicating the MCU status and signal receiving status

Product Interface:

Applications:

 Package Included:

1 x Waveshare Modbus RTU 32-Channel Relay Board RS485 Communication Module