Waveshare Modbus RTU 8 Channel Relay Module RS485

Waveshare Industrial Modbus RTU 8 Channel Relay Module RS485

This is an industrial 8-channel Modbus relay module that is controlled by an RS485 bus and uses the Modbus RTU protocol. This 8 channel Modbus relay board has embedded protection circuits like power isolation, ADI magnetic isolation, TVS diode, and so on. It also includes an ABS enclosure.

The Modbus RTU Relay is extremely simple to use. The Modbus relay module is an ideal choice for industrial control equipment and/or applications with high communication requirements due to its fast communication, stability, reliability, and safety. A reverse-proof circuit that prevents the circuit from accidentally being damaged by an incorrect connection. The MCU status and signal transceiving status are indicated by 3 LEDs, they are:

LED indicators used:

• STA: MCU indicator, keep flashing when the MCU normally working
• TXD: TX indicator, light up when sending data
• RXD: RX indicator, light up when receiving data

Also, read our blog on Applications of Relay explaining 8 major applications, what is it, how does it works, its construction, and different types of relays.

Features

• Configurable device address (1~255) allows multiple devices to cascade on the RS485 bus.
• Flash-on, flash-off function enables automatic relay shutdown after a set time.
• Built-in isolated power supply ensures stable voltage without extra power.
• ADI magnetic isolation for high reliability, strong anti-interference, and low power consumption.
• TVS protection suppresses surge and transient spike voltage for lightning-proof and anti-static safety.
• Optocoupler isolation prevents interference from high-voltage circuits.
• Reverse-proof circuit protects against damage from incorrect wiring.
• High-quality relay with ≤10A 250VAC/30VDC contact rating.
• Rail-mounted ABS plastic enclosure for easy installation and safety.
• Three LED indicators display MCU and signal transmission status.

What’s On Board:

Hardware Diagram of Industrial Modbus RTU 8-ch Relay Module

Applications:

• Industrial Control - Valve control, pump station control, unattended industrial control system
• Smart Home - Controlling appliances like air conditioner, access control, purifier, water heater, and so on
• Intelligent Agriculture - Controlling door curtain motor, air blower, and so on
• Breeding And Farming - Controlling ventilator, lighting, water supply, feeding system, and so on

Package Includes:

• 1 x Modbus RTU RS485 Relay Module
• 1 x Power adapter US plug 5V/2A 5.5/2.1
• 1 x Power adapter EU head

Specifications: