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GMA 240 Installation Manual Page 4-5
190-00917-01 Rev. A
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 Description
16 P2401 MASQ
INHIBIT*
IN
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.
29 P2401 CREW
ISO* IN
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.
13 P2402 PILOT ISO
MUSIC* IN
Ground to allow Music audio to be heard by the pilot during
pilot isolate mode.
19 P2402 BUTTON
PRESS
TONE
ENABLE*
IN
Ground to enable beep tone annunciation of button presses
30 P2402 MUTE ON
COM TX*
IN
Ground to enable muting of other selected radios during mic
selected COM transmission (mic-selected COM is still heard,
but not other selected radios)
* Denotes Active Low (Ground to activate)