Comtech EF Data XPA-200 - Manual (Page 54)

XPA200-7984-I-OPT1, X-Band SSPA Remote Control
XPA200-7984-I-OPT1, Rev.2 5-2
5.3.1 Connector
The remote control port is a female DB-9 connector located
on the rear of the SSPA.
5.3.2 Pin-out
5.3.2.1 RS-232C
PIN NAME FUNCTION
2 TD SSPA Transmit Data
3 RD SSPA Receive Data
5 GND Ground
6 DSR Unit Ready. Always high.
7 RTS Request to Send. Looped to CTS.
8 CTS Clear to Send
It should be noted that Comtech SSPA’s do not require the
hardware handshaking provided by the DSR, RTS and CTS signals.
These signals are provided for customers who are using interface
terminals that require this handshaking. Most of today’s PC’s
are provided with RS-232C serial ports that do not require the
hardware handshaking. In these instances, the interface can be
reduced to three (3) signals; TD, RD and GND.
5.3.2.2 RS-485
Both 2-wire and 4-wire applications are supported. The 4-wire
interface provides independent signal wires for each of the receive
(+RX) signal and its complement (-RX) as well as the transmit (+TX)
signal and its complement (-TX). In the 2-wire interface, the
receive signal and the transmit signal (+RX/TX) share one wire and
likewise the complement signals (-RX/TX) share one wire. Choice of
2-wire versus 4-wire is based on the customers interface equipment
and the cabling between this equipment and the SSPA(s).