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This is an industrial 8-channel Relay module  -8 input - 4 ADC - controlled via RS485 bus, utilizing Modbus RTU protocol. It features embedded protection circuits such as power isolation  TVS diode, etc. It also comes with an DIN Rail Mount enclosure.



  • Configurable device address (1~255), multi devices can be cascaded on RS485 bus
  • Features flash-on, flash-off function, by passing 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, needs no extra power supply for the isolated terminal
  • Onboard unibody ADI magnetical isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption
  • Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightningproof & anti-electrostatic
  • Onboard Optocoupler isolation, prevent interference from external high-voltage circuit connected to the relay
  • Reverse-proof circuit, prevent the circuit from being damaged accidentally by incorrect connection
  • High quality relay, contact rating: ≤10A 250VAC/30VDC
  • Rail-mounted enclosure, easy to install, safe to use
  • 3 LEDs for indicating the MCU status and signal transceiving status


  • Power supply voltage: 12V
  • Communication interface: RS485
  • Baudrate:  9600
  • Default communication format: 9600, N, 8, 1
  • Relay channels: 8   
  • Opto Isolated Inputs  - 8 
  • Analoug Inputs -4 
  • Contact form: 1NO 1NC
  • Communication protocol: Standard Modbus RTU protocol
  • RS485 address: 1~255
  • LED indicators:
    • STA: MCU indicator, Power ON 
    • TXD: TX indicator, light up when sending data
    • RXD: RX indicator, light up when receiving data

Industrial Modbus (Slave) RTU 8-ch Relay Module /Digital in/ Analog in RS485


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