GE PACSystems RX7i Reference Manual page 205

Chapter 5. Communications
COM3 (RX7i only)
COM3, the Station Manager serial port used to support the embedded Ethernet Interface, is RS-232
compatible. COM3 has a 9-pin, female, D-connector. This is a DCE port that allows a simple straight-
through cable to connect with a standard AT-style RS-232 port. This port contains full use of the standard
RS-232 signals for future use with point-to-point protocol (PPP).
Station Manager RS-232 Signals
78
Pin No. Signal Name
1 DCD
2 TXD
3 RXD
4 DSR
5 0V
6 DTR
7 CTS
8 RTS
9 RI
RSTi-EP CPE100/CPE115 : RS232, RS485 Signals
RS-232 Signals
TX
RX
GND
RTS
CTS
194
Description
Data Carrier Detect
Transmit Data
Receive Data
Data Set Ready
Signal Ground
Data Terminal Ready
Clear To Send
Request To Send
Ring Indicator
RS-485 Pins
Y
Z
A
B
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
Signals
TX+
TX-
RX+
RX-
GFK-2222AD