NX-I/O: Selection Guide System Unit Click on the model name to learn more NX-CIF101 NX-CIF210 26 26 Networks Serial I/O Link Master Interface NX-ILM400 RS-422A/ RS-232C RS-485 NX-PC0010 1 Port 2 Port ort 2 P 2 P ort I/O Link Master Ser Inter ial face RS-42 RS-4 2A/ 85 RS-23 2C 1 P ort