Garmin GTX 23 ES Installation Manual

Also see for GTX 23: Installation manual

Contents

Garmin GTX 23 ES Installation Manual Manual pdf 29 page image

GTX 23 Installation Manual Page 4-3190-00906-01 Revision A4.2 Discrete Functions4.2.1 Discrete OutputsExternal suppression should be connected if a DME or TCAS is installed in the aircraft avionics system.The GTX 23 suppression I/O pulses may not be compatible with all models of DME or TCAS. Knownincompatible DME units include the Bendix/King KN 62, KN 64 and KNS 80. These models have anoutput-only suppression port and can be damaged by the GTX 23 mutual suppression output. In this case,do not connect the GTX 23’s suppression pin to the incompatible unit’s suppression pin; however, doconnect the GTX 23’s suppression pin to any other compatible unit’s suppression pin.4.2.2 Discrete Inputs*INACTIVE: 10 ≤ Vin ≤ 33Vdc or Rin ≥100kΩACTIVE: Vin ≤ 1.9Vdc with ≥ 75 uA sink current, or Rin ≤ 375ΩSink current is internally limited to 200 uA max for a grounded inputEXTERNAL IDENT SELECT (remote IDENT) is a momentary input. When grounded, it activates theIDENT pulse for 18 seconds in Mode A replies.EXTERNAL STANDBY SELECT (remote STANDBY) is not a momentary input. When EXTERNALSTANDBY SELECT is grounded, the GTX 23 operates in standby mode. In this mode, the transponderwill not squitter or reply to interrogations.TIS CONNECT SELECT is a momentary input. When grounded, it toggles whether TIS is in standby oroperating.Pin Name Connector Pin I/OEXTERNAL SUPPRESSION I/O (TXP/DME) P2301 31 I/OPin Name Connector Pin I/OEXTERNAL IDENT SELECT* P2301 12 InEXTERNAL STANDBY SELECT* P2301 13 InTIS CONNECT SELECT P2301 46 In