4.4Configuration Pins
4.4.1External 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 | Ground to disable Master Avionics Squelch circuitry. This |
|
| INHIBIT* | will cause alerts and selected radios to be heard at all times |
|
| IN | without needing to exceed the mute threshold. This causes |
|
|
| an increase in background noise from the inputs during quiet |
|
|
| output. |
29 | P2401 | CREW | Ground to configure the unit for CREW ICS isolation. In this |
|
| ISO* IN | 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 | Ground to allow Music audio to be heard by the pilot during |
|
| MUSIC* IN | pilot isolate mode. |
19 | P2402 | BUTTON | Ground to enable beep tone annunciation of button presses |
|
| PRESS |
|
|
| TONE |
|
|
| ENABLE* |
|
|
| IN |
|
30 | P2402 | MUTE ON | Ground to enable muting of other selected radios during mic |
|
| COM TX* | selected COM transmission |
|
| IN | but not other selected radios) |
* Denotes Active Low (Ground to activate)
GMA 240 Installation Manual | Page |
Rev. A |
