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Waveshare Modbus RTU 8-channel Relay Module RS485

Waveshare Modbus RTU 8-channel Relay Module RS485

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Regular price Rs. 3,179
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  • Configurable device address (1255), cascaded multi-devices on the RS485 bus
  • It has a flash-on, and flash-off function, by passing the argument to the command, it is possible to turn on the relay for a while and then close it automatically
  • Onboard unibody power supply isolation provides stable isolated voltage and eliminates the need for an additional power supply for the isolated terminal.
  • Onboard unibody ADI magnetically isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption
  • Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge and transient spike voltages in the circuit, lightning-proof and anti-electrostatic.
  • Onboard Optocoupler isolation prevents a high-voltage circuit from interfering with the relay.
  • High-quality relay with a contact rating of 10A 250VAC/30VDC.
  • Rail-mounted ABS plastic enclosure that is simple to install and use.

Waveshare Modbus RTU 8-channel Relay Module RS485

This is an industrial 8-channel relay module that is controlled by an RS485 bus and uses the Modbus RTU protocol. It 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. It 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.

What’s On Board:



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


Power supply voltage


Communication interface



4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000

Default communication format

9600, N, 8, 1

Relay channel


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Communication protocol

Standard Modbus RTU protocol

RS485 address 


RS485 terminal protection

600W lightning-proof and surge-suppress, 15KV ESD protection (reserved 120R balancing resistor solder pads)

Dimensions (mm) 145 x 90 x 40 (L x B x H)
Weight (gm) 344

Shipping & Returns

  • All orders confirmed before 3 pm IST are shipped on the
    same day, barring rare pickup delays on holidays or disturbances
  • Delivery time in Metro cities is 1-3 days, Others it is
    3-7 days. It varies based on location, reliant on courier services
  • Return window: 7 days from receipt unless stated
    otherwise. No refunds/replacements after
  • Returns only for non-working/damaged products are accepted
  • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
  • Refunds are processed within 3-4 working days post inspection and approval.

For more details, please check our Shipping and Return Policy

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