... .76mb/S, Hsdpa: 7.2mb/S RS485: a, B Interface: RS232, RS485 Standard and Band: GSM850/900/1800/1900MHz 3G modem ... . Designed with industrial grade, supports SMS, CSD, RS232, AT Commands, with the function of accessing internet by dial ... data function8. Standard AT command interface B. Hardware System1.Interface RS232 serial port, rates: 110~230400bits/s Indicator lights: "Power", "ACT ...