... : RS232, RS485 Standard and Band: GSM850/900/1800/1900MHz 3G modem. Designed with industrial grade, supports SMS, CSD, RS232, AT Commands ... , etc. It has been used for sending SMS, alarm system, data transmission, etc .Detailed information A. Wireless Specification1. UMTS/WCDMA/HSDPA/HSUPA ... (UL) / HSDPA: 7.2Mbps(DL)/UMTS: 384kbps(DL/UL)5. EDGE: 236.8kbps(DL/UL)6. GPRS: 85.6Mbps(DL), 42 ...