Audio Inputs/Outputs And Mic Keys; Table 4-7 Mic Audio Inputs And Mic Keys; Table 4-8 Intercom Key Inputs - 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
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)
GMA 240 Installation Manual
Page 4-6

Table 4-7 Mic Audio Inputs and Mic Keys

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
(Section

Table 4-8 Intercom Key Inputs

Pin Name
PILOT ICS KEY* IN
COPILOT ICS KEY* IN
PASSENGER ICS KEY* IN
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
2.3.1). For this configuration, intercom squelch
Description
Enables respective mic audio to be heard in the
intercom
I/O
IN
IN
IN
--
IN
--
IN
--
IN
--
190-00917-01
Rev. D