... TCP/IP protocol stack 3.Open AT command 4.RS232/RS485 IP modem, RS232 modem, GSM IP modem, GPRS data modem, ... /2+Support SMS and CSD function Interfacehigh-powered MCU, 100MRS232 serial port, rates: 110~230400bits/sIndicator lights: Power, ACT, ... SMA female ports, 50 ohmSIM/UIM interface: standard user card interfacePower interface: standard 3-PIN power jackPower supplyStandard power supply ...