190-01499-02 GTX 3X5 Transponder TSO Installation ManualRev. 4 Page 6-13DISCRETE OUTTable 6-8 Discrete OutputsFigure 6-12 Discrete Out PageFunction Pin Selection DescriptionALT ALERT OffAll discrete outputs on P3251When this discrete is grounded, it indicates adeviation from the preset altitude setting.FAIL 1 OffP3251-17Failure of transponder causes discrete toground.FAIL 2 OffAll discrete outputs on P3251 or P3252 Failure of transponder causes discrete to open.RPLY ACTV OffAll discrete outputs on P3251 or P3252Discrete grounds when transponder sendsreplies to interrogations.EQUIP STS OffAll discrete outputs on P3251 or P3252If the unit needs service soon, this discrete willswitch between open and ground for the first 30seconds after power up. If after 30 seconds,there is no detection of ADS-B In/Out failuresthe discrete opens. The discrete will ground ifany ADS-B In/Out failures are detected after 30seconds.TRFC STBY OffAll discrete outputs on P3251Commands TAS/TCAS standby/operate.Discrete output operation automatically setsthrough TAS/TCAS input configuration.GTX 345 only.TRFC TEST OffAll discrete outputs on P3251Commands TAS/TCAS into test mode.GTX 345 only.TRFC ALRT OffAll discrete outputs on P3251 or P3252When a traffic alert is active, this discrete willground. GTX 345 only.TCAD SL OffAll discrete outputs on P3251 or P3252Supports automatic control and integration withRyan TCAD and Avidyne TAS600 Series trafficsystems. GTX 345 only.
