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 (Null Cable) Connection](https://www.cable-tester.com/references/rs232-cross-straight-cable-connection/rs232-cross-cable-null.jpg)
*** Click here for RS232 connector pin out (male/female).
Straight Cable RS232 wiring
![RS232 Straight Cable](https://www.cable-tester.com/references/rs232-cross-straight-cable-connection/rs232-straight-cable.jpg)