... Support transparent data transfe, gprs ip modem, gsm modemgprs modem with rs232 rs485 io for m2m ... port that can conveniently and transparently connect one device to a cellular network, allowing you to connect ... compatible digital I/O channel, ADC, input pulse counter and pulse wave output function. Ideal for M2M ... , GSM850/900/1800/1900MHz(optional)Compliant to GSM phase 2/2+GPRS class 10, class ...