System : 128 MB on-board flash memory
Serial Port: 3 RS-232 ports (SERIAL: 1, 2, 3), non-isolated, RJ45 modular jacks, 1 RS-422/RS-485 port (SERIAL: 4), non-isolated, RJ45 modular jac
Built-in I/O : 16 DI channels, 8 DO channels, 12 AI channels (1-5 V), 2 AO channels (4-20 mA, required for external power supply), 2 PI channels, 1 AI channel (0-32 V)