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Waveshare RTU 8-channel Relay Module RS485 (693)
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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 RS485 relay module features embedded protection circuits like power isolation, ADI magnetic isolation, TVS diode protection, and more, ensuring reliable performance in demanding environments. It also includes a durable ABS enclosure for added safety.
The Modbus RTU relay is extremely simple to use. This modbus relay is an ideal choice for industrial control equipment and applications with high communication requirements due to its fast communication, stability, reliability, and safety. A reverse-proof circuit prevents the module from being damaged by incorrect wiring. The MCU status and signal transceiving status are indicated by 3 LEDs, they are:
LED indicators used:
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.
This waveshare relay module is widely used in industrial automation, smart control systems, IoT-based monitoring, and remote device switching. As a robust RS485 relay module, it enables long-distance communication with multiple devices over a single bus, making it suitable for scalable automation setups. Whether you're building PLC-based systems or integrating with microcontrollers like Raspberry Pi or Arduino, this modbus relay module ensures efficient and reliable switching control.
|
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 |
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)
A Modbus RTU 8-channel relay module is designed for controlling multiple devices remotely through a Modbus RTU protocol. It can switch loads like lights, motors, and other appliances in automation systems. Widely used in industrial automation, building management, and smart home projects, it allows precise control and monitoring of connected equipment via a serial RS485 interface.
An RS485 Modbus relay module operates by receiving commands from a master device via RS485 serial communication. Using the Modbus RTU protocol, it interprets the instructions to switch its relay channels on or off. This setup enables remote control and automation of various electrical devices, making it ideal for both industrial control systems and smart home applications.
Up to 32 devices can be connected in a Modbus RTU network using RS485. This includes relay modules, sensors, or controllers. The RS485 interface supports long-distance communication and multiple device control, making it suitable for large-scale automation setups. Always check the manufacturer’s specifications for maximum device support before installation.
Each relay channel in a Modbus RTU module typically handles loads such as 250V AC 10A or 30V DC 10A, depending on the module model. This capacity allows it to control a variety of devices, including lights, fans, and motors. For safe operation, always verify your device’s voltage and current requirements against the relay module’s maximum ratings.
Yes, this RS485 relay module is ideal for both home automation and industrial control. It enables remote switching of electrical devices, integration with smart control systems, and centralized automation management. Its reliable communication and robust design make it suitable for controlling lights, appliances, and machinery in diverse environments.
