WAVE-25739, 7~36V Industrial Modbus RTU 8-ch Relay Module (B) with RS485 Interface, Multi Isolation Protection Circuits

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, magnetical isolation, TVS diode, etc. It also comes with an ABS enclosure. The Modbus RTU Relay (B) 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.

Features:

• Configurable device address (1~255), multi-devices can be cascaded on RS485 bus
• Features flash-on, and flash-off functions, by passing an 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 needs no extra power supply for the isolated terminal
• Onboard unibody magnetical isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption
• Onboard resettable fuse and TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, provides over-current/over-voltage proof, lightning proof & anti-electrostatic
• Onboard Optocoupler isolation, prevents the relay from being interfered with by high-voltage circuit
• Adopts dedicated relay driver chip, with built-in flyback diode protection, for stronger and more stable driving ability
• Reverse-proof circuit prevents the circuit from being damaged accidentally by an incorrect connection
• High-quality relay, contact rating: ≤10A 250VAC/30VDC
• Rail-mounted ABS plastic enclosure, easy to install, safe to use
• 3 LEDs for indicating the MCU status and signal transceiving status

Specifications:

Power Supply: 7~36V

Communication Interface: RS485

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

Default Communication Format: 9600, N, 8, 1

Relay Channels: 8

Contact Form: 1NO, 1NC

Contact Rating: ≤10A 250VAC/30VDC

Communication Protocol: Standard Modbus RTU protocol

RS485 Address: 1~255

LED Indicators: STA (MCU indicator, keeps flashing when the MCU is normally working), TXD (TX indicator, lights up when sending data), RXD (RX indicator, lights up when receiving data).

Dimensions:

Wiki: https://www.waveshare.com/wiki/Modbus_RTU_Relay