Configuration Pins - Garmin GMA 240 Installation Manual

4.4

Configuration Pins

4.4.1 External Configuration Pins
The following pins may be used to change the configuration of the installation as described.
Pin Connector Pin Name
16 P2401 MASQ
INHIBIT*
IN
29 P2401 CREW
ISO* IN
13 P2402 PILOT ISO
MUSIC* IN
19 P2402 BUTTON
PRESS
TONE
ENABLE*
IN
30 P2402 MUTE ON
COM TX*
IN
* Denotes Active Low (Ground to activate)
GMA 240 Installation Manual
190-00917-01
Description
Ground to disable Master Avionics Squelch circuitry. This
will cause alerts and selected radios to be heard at all times
without needing to exceed the mute threshold. This causes
an increase in background noise from the inputs during quiet
output.
Ground to configure the unit for CREW ICS isolation. In this
configuration, the copilot headset jack should be wired in
parallel with the pilot headset output. The mics are wired as
normal. In this mode, when the PILOT ISO button is
selected, the pilot and copilot will hear each other, but will be
intercom isolated from the passengers.
Ground to allow Music audio to be heard by the pilot during
pilot isolate mode.
Ground to enable beep tone annunciation of button presses
Ground to enable muting of other selected radios during mic
selected COM transmission (mic-selected COM is still heard,
but not other selected radios)
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Rev. A