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2Digital Input + 2Digital Output (Power Relay) RS485 ModBus Remote Terminal Unit


2Digital Input + 2Digital Output (Power Relay) RS485 ModBus Remote Terminal Unit

RTU module which comes with 2 digital inputs and 2 power relay outputs.

The inputs can collect from dry or wet contact signal with the flexibility to set the input circuit as common anode or common cathode.


Main Features

v  Supply voltage: 10V-30V

v  Communication Protocol: RS485 Modbus-RTU protocol

v  RS485 interface is protected against overvoltage and overcurrent

v  Power polarity protection

v  Device power consumption: 2W


Technical Specifications



Parameter & Description

Signal Input

Input channel:

2 x Dry contact or wet node switch input

Signal type:

Common Yin/Yang input polarity identification

Signal level:

High level (30V ~ 10V) Low level (0V ~ 3V)

Sampling rate:


Isolated voltage protection:

1000V (active input)

Signal Output

Output channel:

2x Normally open relay output

Load capacity:

Resistive load 250V/10A inductive load 250V/3A

Isolated voltage protection:


Communication Output

Communication protocol:


Interface type:

Isolated RS485 communication protected against overvoltage and overcurrent

Baud rate:

1200bps, 2400bps, 4800bps, 9600bps, 19200bps, 38400bps, 57600bps, 115200bps

Check bit:

No parity check, parity check


Module ADDRESS, baud rate, parity bit is set up by the software

Communication distance:

9600bps 1200 meters

Module Size

Separate module size: 115mm*90mm*40mm


Standard DIN guide rail installation

Working Environment

Temperature: -10 ~ +55

Humidity: 35~85% (not dew)

Working Power Supply

Power supply voltage:

10V~30V wide range of power supply, with the power supply polarity protection

Power consumption:

Less than 2W



Digital Input Wiring Diagram