It is design for working in the harsh industrial application environment, widely used in a variety of industrial automation, security monitoring system, automatically measurement and control system, BTS monitoring, remote data acquisition, telemetrically systems, automatically control system. It can be used as a remote switch, remote I/O, remote smart PLC, timer switches.It supports 2 RS485 transparent data transmission. 2 RS485 ports can be used one as Modbus RTU Master and the other as Slave at the same time.