Garmin GMA 240 installation manual 4.5Audio Inputs/Outputs and Mic Keys

4.5Audio Inputs/Outputs and Mic Keys

4.5.1Mic Audio Inputs and Mic Keys

Pin	Connector		Pin Name	Description	I/O
34	P2401	PILOT MIC KEY* IN		Enables respective MIC audio into	IN
33	P2402	COPILOT MIC KEY* IN		the selected transceiver unit	IN
33	P2401	PILOT MIC AUDIO IN HI		Pilot Mic audio input and ground	IN
				reference
35	P2401	PILOT MIC IN LO			--
32	P2402	COPILOT MIC AUDIO IN HI		Copilot Mic audio input and ground	IN
				reference
34	P2402	COPILOT MIC IN LO			--
35	P2402	PASS 1	MIC AUDIO IN HI	Passenger 1 Mic audio and ground	IN
36	P2402	PASS 1	MIC AUDIO IN LO	reference	--
37	P2402	PASS 2	MIC AUDIO IN HI	Passenger 2 Mic audio and ground	IN
38	P2402	PASS 2	MIC AUDIO IN LO	reference	--

*Denotes Active Low (Ground to activate)

4.5.2Intercom Key Inputs (if configured)

These inputs only perform the described ICS KEY function if the audio panel has been configured for KEYED ICS by configuration jumper settings (see Section 2.3.1). For this configuration, intercom squelch levels should be set fully CCW (live MIC) because the MIC signal must also break the VOX threshold to be heard.

Pin	Connector	Pin Name	Description
17	P2402	PILOT ICS KEY* IN	Enables respective mic audio to be heard
36	P2401	COPILOT ICS KEY* IN
			in the intercom
37	P2401	PASSENGER ICS KEY* IN

*Denotes Active Low (Ground to activate)

4.5.3COM Audio and Mic Keys

Pin	Connector	Pin Name	Description	I/O
12	P2401	COM 1 MIC KEY* OUT	Enables transmission on the	OUT
30	P2401	COM 2 MIC KEY* OUT	respective transceiver unit	OUT
9	P2401	COM 1 AUDIO IN HI	COM 1 Audio Input	IN
11	P2401	COM 1 MIC AUDIO OUT HI	COM 1 Audio Output	OUT
10	P2401	COM 1 AUDIO LO	Ground Reference for COM 1	--
13	P2401	COM 2 AUDIO IN HI	COM 2 Audio Input	IN
15	P2401	COM 2 MIC AUDIO OUT HI	COM 2 Audio Output	OUT
14	P2401	COM 2 AUDIO LO	Ground Reference for COM 2	--

* Denotes Active Low (Sinks current to ground when active)

Page 4-6	GMA 240 Installation Manual
Rev. A	190-00917-01