... /IP protocol stack, i/o 3.Support transparent data transfer 4. Support DDNS IP modem, RS232 modem, GSM IP modem, GPRS ... 1mA@12VDC. It has compatible digital I/O channel, ADC, input pulse counter and pulse wave output function. Ideal for M2M ... another backupSupply 5 I/O channels, compatible 2 pulse wave output channels, 2 analog inputs and one pulse input counters.Support multi data centers ...