The TER-GP190-WS comes with an internal PYTHON engine and a hardware watchdog. It easily replaces PLC. The TER-GP190-WS uses 2G/GSM/GPRS networks for connection. The device has three LED lights: Error or ERR light which is red, Application or APP light which is yellow and Status or STA light which is green. The RS232 9-pole SUB-D connector is on the same side of the device. TER-GP190-WS has a SMA/M antenna connector and an internal SIM holder. It has 4 digital 0-28 VDC inputs which are fully decoupled (optional 2 digital and 32 sensors via I2C). In case of an emergency or blackout, TER-GP190-WS has an optional battery which can last up to 4 hours. The case is made up of aluminium alloy (IP20) and the working temperature range is from -25°C to +70°C.