Comtech EF Data XPA-200 - Manual (Page 24)

XPA200-7984-I-OPT1, X-Band SSPA Introduction
XPA200-7984-I-OPT1, REV.3 1-8
1.11.1 RS-485/RS-232C Interface (COM1), Connector J6
The RS-485/RS-232C Interface connector, J6, is a 9 pin "D"
type DB9F connector socket. The pin-out specifications are
contained in Table 1-1. The mating connector is a DB9M.
Table 1-1.
J6, COM1 connector Pin-Out
Pin # RS-232C RS-485 4-Wire RS-485 2-Wire
1 no connect GND; Ground GND; Ground
2 TD; Transmit Data no connect no connect
3 RD; Receive Data no connect no connect
4 no connect +TX; Signal +RX/TX; Signal
5 GND; Ground -TX; Signal
Complement
-RX/TX; Signal
Complement
6 DSR; Unit Ready -
always high.
no connect no connect
7 RTS; Request to
Send. Looped to
CTS
no connect no connect
8 CTS; Clear to
Send
+RX; Signal +RX/TX; Signal
9 no connect -RX; Signal
Complement
-RX/TX; Signal
Complement