Garmin GTX327 Installation Manual

Also see for GTX 327: Pilot's guide Pilot's guide Installation manual Pilot's guide Pilot's guide

GTX 327 Installation Manual Page 4-5190-00187-02 Revision K4.3 Discrete InputsTable 4-5. Discrete Inputs Pin AssignmentsPin Name Pin Number I/OEXTERNAL IDENT SELECT* 8 InXPDR SYSTEM ID PROGRAM* 16 InAIRBORNE SENSE (SQUAT SWITCH) 22 InEXTERNAL SUPPRESSION (TXP/DME) 17 In/Out* These inputs are considered active if either the voltage to ground is < 1.9 V or the resistance toground is < 375 Ω. These inputs are considered inactive if the voltage to ground is 11-33 Vdc.EXTERNAL IDENT SELECT (remote IDENT) is a momentary input. Refer to Figures C-1 and C-2 forthe remote IDENT switch interconnect and to Sections 5.2.6.2 and 5.2.10 for the configuration.AIRBORNE SENSE (SQUAT SWITCH) IN is an ON or OFF input. The squat switch is one of theAirborne Determination methods available for sensing airborne status. Input for Airborne Determinationallows automatic start and stop of the flight timer and enables automatic STBY mode selection. Refer toFigure C-2 for the squat switch interconnect and Sections 5.2.6.2 and 5.2.10 for squat switchconfiguration.EXTERNAL STANDBY SELECT* (remote STBY) is an ON or OFF input used typically for dualtransponder installations. When grounded, the GTX 327 is placed in standby. Refer to the figures inAppendix C and Section 5.2.10 for the EXTERNAL STANDBY SELECT interconnect.EXTERNAL SUPPRESSION should be connected if a DME is installed in the aircraft avionics system.The GTX 327 suppression I/O pulses may not be compatible with all models of DME. Knownincompatible units include the Bendix/King KN 62, KN 64 and KNS 80. These models have an output-only suppression port and can be damaged by the GTX 327 mutual suppression output. In this case, leavethe suppression pin open. Refer to Figure C-2 for the external suppression interconnect.