... , RS485 Standard and Band: GSM850/900/1800/1900MHz 3G modem. Designed with industrial grade, supports SMS, CSD, RS232, AT Commands, with the function ... by dial-up, etc. It has been used for sending SMS, alarm system, data transmission, etc .Detailed information A. Wireless ... 6. GPRS: 85.6Mbps(DL), 42.8Kbps(UL)7. Support SMS, CSD and data function8. Standard AT command interface B. Hardware ...