... Open AT command 4.RS232/RS485 IP modem, RS232 modem, GSM IP modem, GPRS data modem, data terminal,GPRS DTU, TCP ... class 10Compliant to GSM phase 2/2+Support SMS and CSD function Interfacehigh-powered MCU, 100MRS232 serial port, rates: ... transparent data transfer and protocol conversion. Support multi work modesSupport dynamic domain name(DDNS) and IP access to data centerSupport double data centers ...