GE PACSystems RX7i Reference Manual page 200

Features Supported
Feature
RTU Slave protocol
SNP Slave
Serial I/O – used with COMMREQs
Firmware Upgrade
(WinLoader utility)
Message Mode –used only with C blocks
(C Runtime Library Functions:
serial read, serial write, sscanf, sprintf)
Station Manager (RX7i only)
RS-232
RS-485
76
Serial IO is the only protocol supported by CPE400.
77
RX3i CPE302, CPE305, CPE310, CPE330, CPE400, ETM001 & EDS001 support Station Manager using UDP over Ethernet, but
not via serial communications.
GFK-2222AD
Serial Port 1
(COM1)
Yes
Yes
76
Yes
PLC in
STOP/No IO mode
Yes
77
No
Yes
No
April 2018
Chapter 5. Communications
Serial Port 3
Serial Port 2
(Station Mgr)
(COM2)
RX7i only
Yes No
Yes No
Yes No
No No
Yes No
77
No Yes
No Yes
Yes No
189