Omron C-series Installation Manual page 40

Standard Models
Wire Cable
We recommend the following cables for RS-422, RS-232C, and RS-485 connections.
32
Cable type
RS-232C CO-DS-IREVV-SX-10P x 0.18 mm2 (Hitachi Cable)
RS-422 CO-HC-ESV-3P x 7/0.2 (Hirakawa Cable)
RS-485 VCTF 0.75 x 2C (JIS)
Recommended Cable
Appendix A