General Dynamics CG-1220, Operation And Maintenance Manual

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Installation
3-6 CG-1220 DTR
SETUP/RESTORE-BEACONS menu or from the I/O Interface #1 inputs while the
DTR is in REMOTE control.
3.3.1.1.4 General Purpose I/O
GPIO 4, 5, and 8–15 are reserved for future use on the standard product; no
connections should be made to these pins. GPIO 4 – 5 and GPIO 8 - 9 are used for
POL 3 - 4 and POL 5 - 6 select control lines when used with the Multi Port Option
(see Section 3.3.1.1.5).
3.3.1.1.5 External Pol Select Control Lines (GPIO 6-7, 4-5, 8-9)
Pin groups (11,24) and (12,25)–isolated output relays, normally closed--provide
two polarization select control lines for a customer furnished switch (external to
the DTR). The menu item POL SELECT (POL 1, POL 2) controls the two
polarization select control lines on the GPIO 6 and 7 of I/O Interface #1. This was
implemented for backward compatibility with a GDST Model TRL Tracking Receiver
which provided some I/O lines to facilitate control of an external POL Switch,
mounted on the hub with the RF equipment. Notice that these lines are controlled
by the Pol Select item on the DTR main menu.
Pin groups (9,22), (10,23) on I/O interface 1 and (5,18), (6,19) on I/O interface 2
– AVAILABLE WITH MULTI PORT OPTION ONLY. Isolated output relays, normally
closed--provide four additional polarization select control lines for a customer
furnished switch (external to the DTR). The menu item POL SELECT (POL 3, POL
4, POL 5, POL 6) controls the four polarization select control lines on the GPIO 4
and 5 of I/O Interface #1 and GPIO 5 and 6 of I/O interface #2.
3.3.1.1.6 Signal Ground
Pin 13 is reserved for future use on the standard receiver. No connection should be
made to this pin.