56 Rockwell Automation Publication 2080-UM002L-EN-E - November 2021
Chapter 4 Wire Your Controller
Embedded Serial Port
Pinout Explanations
Pin Definition RS-485 Example RS-232 Example
1 RS-485+ B(+) (not used)
2 GND GND GND
3 RS-232 RTS (not used) RTS
4 RS-232 RxD (not used) RxD
5 RS-232 DCD (not used) DCD
6 RS-232 CTS (not used) CTS
7 RS-232 TxD (not used) TxD
8 RS-485- A(-) (not used)
IMPORTANT
• Do not connect the GND pin of the serial port to Earth/Chassis Ground. The
GND pin of the serial port is the DC common for the Serial Port
Communication signals and is not intended for Shield Ground.
• If the length of the serial cable is more than 3 meters, use an isolated seri
al
por
t, catalog number 2080-SERIALISO
L.
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