Gwx 75 Installation Manual Best (2025)

Ground the unit directly to the primary aircraft structure using a heavy-gauge braid. Improper grounding introduces audio hum into cockpit intercoms and creates digital data errors. Pinout and Connection Map (Typical Configuration) Pin Number Wire Type / Specification Pin 1 +28 VDC Aircraft Power 20 AWG, M22759/16 Pin 2 Power Ground 20 AWG, M22759/16 Pin 3 Garmin HSDB Out (Tx A) 24 AWG, Shielded Ethernet Pin 4 Garmin HSDB Out (Tx B) 24 AWG, Shielded Ethernet Pin 5 Garmin HSDB In (Rx A) 24 AWG, Shielded Ethernet Pin 6 Garmin HSDB In (Rx B) 24 AWG, Shielded Ethernet Pin 7 ARINC 429 In (Heading A) 22 AWG, Shielded Twisted Pair Pin 8 ARINC 429 In (Heading B) 22 AWG, Shielded Twisted Pair Pin 9 Remote Power On / Discrete 22 AWG, M22759/16

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Install the structural mounting bracket using aviation-grade hardware (MS or AN series screws and self-locking nuts). Ground the unit directly to the primary aircraft

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