Comtech EF Data XPA-200 Installation And Operation Manual page 54

XPA200-7984-I-OPT1, X-Band SSPA
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
2
3
5
6
7
8
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.
are provided with RS-232C serial ports that do not require the
hardware handshaking.
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).
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).
XPA200-7984-I-OPT1, Rev.2
NAME FUNCTION
TD SSPA Transmit Data
RD SSPA Receive Data
GND Ground
DSR Unit Ready.
RTS Request to Send.
CTS Clear to Send
In these instances, the interface can be
Always high.
Looped to CTS.
Most of today's PC's
In the 2-wire interface, the
Remote Control
5-2