Installation
3-8
CG-1220 DTR
3.3.1.2.1 Degree Command Control (GPIO 0-1, 10-15)
The phase shifter outputs are formed through I/O Interface #1 pin groups (5,18)
and (6,19) as well as I/O Interface #2 (7,20), (8,21), (9,22), (10,23), (11,24), and
(12,25)—common ground driver IC.
3.3.1.2.2 Mute Control (GPIO 2)
The mute select control line output is formed through I/O Interface #1 pin group
(7,20)--isolated output relay, normally closed. Mute commands the tracking plate
to bypasses the monopulse error channel while allowing the sum channel to pass.
Mute is normally on; when the DTR is commanded to start monopulse, mute is
turned off. It can be set in the MONOPULSE menu.
3.3.1.2.3 Mute Status (GPIO 8-9)
The MUTE STATUS inputs are formed through I/O Interface #2 pin groups (5,18)
and (6,19)—internal drive common ground, short GPIO + to – to turn off optically
coupled isolator. GPIO 8-9 are inputs that the DTR uses to monitor the operation
of the mute switch on the monopulse tracking plate. A fault is set if the switch
fails to operate. NOTE: Some monopulse tracking plates may not have this
functionality. It can be disabled in the MONOPULSE menu.
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