There are two typical RS232 cables used in the industrial.

• Crossed RS232 cable (or known as null modem cable)
• Straight RS232 cable

Cross Cable RS232 wiring

Cross cable wiring for RS232 usually happens between two DCE (data communication equipment) devices, or two DTE (Data Terminal Equipment) devices.

RS232 Cross Cable wiring

*** Click here for RS232 connector pin out (male/female).

Straight Cable RS232 wiring

RS232 Straight Cable wiring

*** Click here for RS232 connector pin out (male/female).