Waveshare Industrial Modbus RTU 8-Channel Relay Module RS485 Bus, Multi Protection (Without Power Adapter)


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SKU: 968478
  1. Power supply voltage: 5V
  2. Communication interface: RS485
  3. Relay channels: 8
  4. Contact form: 1NO 1NC
  5. RS485 address: 1~255
  6. Communication protocol: Standard Modbus RTU protocol


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Category: USB Interface Module
Tags: 8 Channel Relay, Waveshare, Industrial Modbus, 8-ch Relay, RTU

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.

Hardware Analysis Industrial Modbus RTU 8-ch Relay Module

Waveshare Industrial Modbus Rtu 8-Ch Relay Module

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 equipment and/or applications with high communication requirements.


  1. Configurable device address (1~255), multi-devices can be cascaded on RS485 bus
  2. Features flash-on, flash-off function, bypassing an argument to the command, it is possible to turn on the relay for a while and then close it automatically
  3. Onboard unibody power supply isolation, provides stable isolated voltage, needs no extra power supply for the isolated terminal
  4. Onboard unibody ADI magnetical isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption
  5. Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic
  6. Onboard Optocoupler isolation, prevent the relay from being interfered with by a high-voltage circuit
  7. Reverse-proof circuit, prevent the circuit from being damaged accidentally by incorrect connection
  8. High-quality relay, contact rating: ≤10A 250VAC/30VDC
  9. Rail-mounted ABS plastic enclosure, easy to install, safe to use
  10. 3 LEDs for indicating the MCU status and signal transceiving status

Useful link:

To do Hardware and Software setup, please follow this tutorial.

Package Includes:

1 x Modbus RTU Relay


Communication Interface



4800 ~ 256000

Default communication format

9600, N, 8, 1

Relay Channels


Contact Form


Communication protocol

Standard Modbus RTU protocol

RS485 Address


RS485 Terminal Protection

600W lightning-proof and surge-suppress
15KV ESD protection

Length (mm):


Width (mm):


Height (mm):


Weight (g):


Shipping Weight 0.42 kg
Shipping Dimensions 21 × 12 × 5 cm
6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China