... public GPRS network.It adopts high-powered industrial 32 bits CPU and embedded real time operating system. It ... Interface TypeItemContentSerial1 RS232 port and 1 RS485(orRS422) port, 15KV ESD protectionData bits: 5, 6 ,7, 8Stop bits: 1, 1.5, 2Parity: none, ... interface, 50 ohm, lighting protection(optional)SIM/UIMStandard 3V/1.8V user card interface, 15KV ESD protectionPowerTerminal block interface ...