... 1900MHz 3G modem. Designed with industrial grade, supports SMS, CSD, RS232, AT Commands, with the function of accessing internet ... B. Hardware System1.Interface RS232 serial port, rates: 110~230400bits/s Indicator lights: "Power", "ACT", "Online"Antenna interface: ... card interfacePower interface: Standard 3-PIN power jack2. Power supply Standard power supply: DC 12V/0.5APower range: DC 5~26V3. ...