... modem. Designed with industrial grade, supports SMS, CSD, RS232, AT Commands, with the function of accessing internet by ... alarm system, data transmission, etc .Detailed information A. Wireless Specification1. UMTS/WCDMA/HSDPA/HSUPA 850/900/1900/2100MHz2. Quad ... data function8. Standard AT command interface B. Hardware System1.Interface RS232 serial port, rates: 110~230400bits/s Indicator lights: " ...