Serial Port Electrical Isolation - Emerson PACSystems RX3i User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual
GFK-2222AK
5.2.3.5.2 Station Manager RS-232 Signals
Pin No.
5.2.4

Serial Port Electrical Isolation

Some serial communication ports are isolated, while others are not, as indicated in the
following table:
Family
RX3i
Communications
Signal Name
68
1 DCD
2 TXD
3 RXD
4 DSR
5 0V
6 DTR
7 CTS
8 RTS
9 RI
Model
CPU310
CPU315
CPU320/CRU320
CPE302/CPE305
CPE310
CPE330
CPE400/CPL410
Description
Data Carrier Detect
Transmit Data
Receive Data
Data Set Ready
Signal Ground
Data Terminal Ready
Clear To Send
Request To Send
Ring Indicator
COM1 COM2
Non-Isolated Non-Isolated
Non-Isolated Non-Isolated
Non-Isolated Non-Isolated
Non-Isolated N/A
Non-Isolated Non-Isolated
N/A N/A
Non-Isolated N/A
Section 5
October 2019
COM3
N/A
N/A
N/A
N/A
N/A
N/A
N/A
130