GE PACSystems RX7i Reference Manual page 204

COM2 (RS-485, 15-pin Female D-sub Connector) – All RX3i CPU/CRU Models
& RX3i CPE310
This is a DCE port that allows a simple straight-through cable to connect with a standard AT-style
RS-232 port.
COM2 RS-485 Signals
Pin No. Signal Name Description
1 Shield
2 NC
3 NC
4 NC
5 +5Vdc
6 RTS(A)
7 0V
8 CTS(B')
80
9 RT
80, 81
10 RD(A')
81
11 RD(B')
12 SD(A)
13 SD(B)
14 RTS(B')
15 CTS(A')
GFK-2222AD
Cable Shield
Located at the bottom right of the connector as viewed from the front of the
module.
No Connection
No Connection
No Connection
Logic Power: Provides isolated +5Vdc power (300mA maximum) for
powering external options.
Differential Request to Send A
Signal Ground
Differential Clear To Send B
Resistor Termination
Differential Receive Data A
Differential Receive Data B
Differential Send Data A
Differential Send Data B
Differential Request To Send B
Differential Clear To Send A
April 2018
Chapter 5. Communications
193