Audio Inputs/Outputs And Mic Keys - Garmin GMA 240 Installation Manual

4.5

Audio Inputs/Outputs and Mic Keys

4.5.1 Mic Audio Inputs and Mic Keys
Pin Connector
34 P2401
33 P2402
33 P2401
35 P2401
32 P2402
34 P2402
35 P2402
36 P2402
37 P2402
38 P2402
*Denotes Active Low (Ground to activate)
4.5.2 Intercom 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
17 P2402
36 P2401
37 P2401
*Denotes Active Low (Ground to activate)
4.5.3 COM Audio and Mic Keys
Pin Connector
12 P2401
30 P2401
9 P2401
11 P2401
10 P2401
13 P2401
15 P2401
14 P2401
* Denotes Active Low (Sinks current to ground when active)
Page 4-6
Rev. A
Pin Name
PILOT MIC KEY* IN
COPILOT MIC KEY* IN
PILOT MIC AUDIO IN HI
PILOT MIC IN LO
COPILOT MIC AUDIO IN HI
COPILOT MIC IN LO
PASS 1 MIC AUDIO IN HI
PASS 1 MIC AUDIO IN LO
PASS 2 MIC AUDIO IN HI
PASS 2 MIC AUDIO IN LO
Pin Name
PILOT ICS KEY* IN
COPILOT ICS KEY* IN
PASSENGER ICS KEY* IN
Pin Name
COM 1 MIC KEY* OUT
COM 2 MIC KEY* OUT
COM 1 AUDIO IN HI
COM 1 MIC AUDIO OUT HI
COM 1 AUDIO LO
COM 2 AUDIO IN HI
COM 2 MIC AUDIO OUT HI
COM 2 AUDIO LO
Description
Enables respective MIC audio into
the selected transceiver unit
Pilot Mic audio input and ground
reference
Copilot Mic audio input and ground
reference
Passenger 1 Mic audio and ground
reference
Passenger 2 Mic audio and ground
reference
Description
Enables respective mic audio to be heard
in the intercom
Description
Enables transmission on the
respective transceiver unit
COM 1 Audio Input
COM 1 Audio Output
Ground Reference for COM 1
COM 2 Audio Input
COM 2 Audio Output
Ground Reference for COM 2
GMA 240 Installation Manual
I/O
IN
IN
IN
--
IN
--
IN
--
IN
--
I/O
OUT
OUT
IN
OUT
--
IN
OUT
--
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