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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 serial
port, catalog number 2080-SERIALISOL.
1
2
3
4
6
7
8
5