The Omron NX1W-CIF01 is an RS-232C serial communication option card for the NX Series of programmable logic controllers. It mounts into a slot on the NX CPU or bus coupler to add a serial port for connecting to HMIs, barcode scanners, drives, or other RS-232C devices.
What the RS-232C interface means for fit
RS-232C is a point-to-point serial protocol, not a multidrop bus like RS-485. This card connects one device per port, at distances typically up to 15 meters. Baud rate, parity, and stop bits are configured in the NX unit's software — no DIP switches on the card itself. The connector is a standard 9-pin D-sub (male or female depends on the cable assembly; the card side is typically male, so a straight-through cable to a PC or HMI works, but verify pinout against the device you're connecting to).