GE PACSystems RX7i - Page 205

Chapter 5. Communications
194 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD
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
Pin No.
78
Signal Name
Description
1
DCD
Data Carrier Detect
2
TXD
Transmit Data
3
RXD
Receive Data
4
DSR
Data Set Ready
5
0V
Signal Ground
6
DTR
Data Terminal Ready
7
CTS
Clear To Send
8
RTS
Request To Send
9
RI
Ring Indicator
RSTi-EP CPE100/CPE115 : RS232, RS485 Signals
RS-232 Signals
RS-485 Pins
Signals
TX
Y
TX+
RX
Z
TX-
GND
A
RX+
RTS
B
RX-
CTS