... modem 2.with standard TCP/IP protocol stack, i/o 3.Support transparent data transfer 4. Support DDNS ... io for m2m meter readinggprs modem(DTU) with I/OF2114 GPRS IP MODEM is a kind of cellular ... , 1ower than 1mA@12VDC. It has compatible digital I/O channel, ADC, input pulse counter and pulse ... double data centers, one main and another backupSupply 5 I/O channels, compatible 2 pulse wave output channels, ...