Post Installation Configuration & Checkout190-01499-02 GTX 3X5 Transponder TSO Installation ManualRev. 9 Page 6-13Discrete OutTable 6-8 Discrete Outputs[1] Available in system software v2.10 or later.Figure 6-12 Discrete Out PageFunction Pin Selection Description NotesALT ALERT OffAll discrete outputs on P3251 or P3252When this discrete is grounded, itindicates a deviation from the presetaltitude setting.FAIL 1 OffP3251-17Failure of transponder causes discreteto ground.FAIL 2 OffAll discrete outputs on P3251 or P3252Failure of transponder causes discreteto open.RPLY ACTV OffAll discrete outputs on P3251 or P3252Discrete grounds when transpondersends replies to interrogations.EQUIP STS OffAll discrete outputs on P3251 or P3252If the unit needs service soon, thisdiscrete will switch between open andground for the first 30 seconds afterpower up. If after 30 seconds, there isno detection of ADS-B In/Out failuresthe discrete opens. The discrete willground if any ADS-B In/Out failures aredetected after 30 seconds.TRFC STBY OffAll discrete outputs on P3251 or P3252Commands TAS/TCAS standby/operate. Discrete output operationautomatically sets through TAS/TCASinput configuration. GTX 345 only.TRFC TEST OffAll discrete outputs on P3251 or P3252Commands TAS/TCAS into test mode.GTX 345 only.TRFC ALRT OffAll discrete outputs on P3251 or P3252When a traffic alert is active, thisdiscrete will ground. GTX 345 only.TCAD SL OffAll discrete outputs on P3251 or P3252Supports automatic control andintegration with Ryan TCAD andAvidyne TAS600 Series traffic systems.GTX 345 only.XPDR ACTV OffAll discretes outputs on P3251Discrete grounds when transponder isnot in standby. [1]ADS-B OUT OffAll discrete outputs on P3251 or P3252Discrete grounds when ADS-B Out ison and the unit does not have a validGPS position.[1]
