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Waveshare Modbus RTU 8 Channel Relay Module RS485
Waveshare Modbus RTU 8 Channel Relay Module RS485
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- Industrial 8-channel relay module controlled via RS485 using Modbus RTU protocol.
- Fast, stable, and reliable communication, ideal for industrial control applications.
- Configurable device address (1~255) supports multiple devices on the RS485 bus.
- Flash-on, flash-off function allows automatic relay shutdown after a set time.
- Built-in power isolation ensures stable voltage without extra power supply.
- High-quality relay with a contact rating of ≤10A 250VAC/30VDC.
- Rail-mounted ABS enclosure for easy installation and safety.
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:
Power supply voltage |
5V Relay |
Communication interface |
RS485 |
Baudrate |
4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 |
Default communication format |
9600, N, 8, 1 |
Relay channel |
8 |
Contact form |
1NO 1NC |
Communication protocol |
Standard Modbus RTU protocol |
RS485 address |
1~255 |
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 W x H) |
Weight (gm) | 344 |
Shipping & Returns
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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The build quality of this relay module is excellent; it feels sturdy and well-constructed. This gives me confidence in its durability during extended use.
The documentation provided was clear and concise, making installation and configuration easy even for beginners
This relay module is versatile and suitable for various applications including home automation and industrial control systems. It has performed exceptionally well in all tests.
Shipping was prompt, and the packaging was secure. The relay module arrived intact and ready to be installed
For the features offered, this relay module provides great value for money. It outperforms many others at a similar price point