Garmin GMA 240 Installation Manual - Page 28

4.5 Audio Inputs/Outputs and Mic Keys 4.5.1 Mic Audio Inputs and Mic Keys Pin Connector Pin Name 34 P2401 PILOT MIC KEY* IN 33 P2402 COPILOT MIC KEY* IN 33 P2401 PILOT MIC AUDIO IN HI 35 P2401 PILOT MIC IN LO 32 P2402 COPILOT MIC AUDIO IN HI 34 P2402 COPILOT MIC IN LO 35 P2402 PASS 1 MIC AUDIO IN HI 36 P2402 PASS 1 MIC AUDIO IN LO 37 P2402 PASS 2 MIC AUDIO IN HI 38 P2402 PASS 2 MIC AUDIO IN LO *Denotes Active Low (Ground to activate) Description I/O Enables respective MIC audio into IN the selected transceiver unit IN Pilot Mic audio input and ground IN reference -- Copilot Mic audio input and ground IN reference -- Passenger 1 Mic audio and ground IN reference -- Passenger 2 Mic audio and ground IN reference -- 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 Pin Name 17 P2402 PILOT ICS KEY* IN 36 P2401 COPILOT ICS KEY* IN 37 P2401 PASSENGER ICS KEY* IN *Denotes Active Low (Ground to activate) Description Enables respective mic audio to be heard in the intercom 4.5.3 COM Audio and Mic Keys Pin Connector Pin Name Description 12 P2401 COM 1 MIC KEY* OUT Enables transmission on the 30 P2401 COM 2 MIC KEY* OUT respective transceiver unit 9 P2401 COM 1 AUDIO IN HI COM 1 Audio Input 11 P2401 COM 1 MIC AUDIO OUT HI COM 1 Audio Output 10 P2401 COM 1 AUDIO LO Ground Reference for COM 1 13 P2401 COM 2 AUDIO IN HI COM 2 Audio Input 15 P2401 COM 2 MIC AUDIO OUT HI COM 2 Audio Output 14 P2401 COM 2 AUDIO LO Ground Reference for COM 2 * Denotes Active Low (Sinks current to ground when active) I/O OUT OUT IN OUT -IN OUT -- Page 4-6 Rev. B GMA 240 Installation Manual 190-00917-01