The remote terminal unit S274 features 4 digital inputs, 4 relay outputs, 1 temperature and humidity input, and 1 RS485 serial port. The remote terminal unit supports Modbus RTU over TCP, Modbus TCP, MQTT protocol. 
The remote monitoring module is designed for remote measurement and control system and remote data acquisition telemetry systems, such as smoke, liquid, water, flow, flood, electricity, power, energy remote monitoring and remote control.