Garmin GTX 327 Installation Manual

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

Page 16 GTX 327 Installation ManualRev J 190-00187-022.6.2.4 Altimeter Selection PriorityThe installer must be aware of the GTX 327 priority for selecting encoded altimeter interconnections.The GTX 327 searches in this sequence for altitude, and stops when it finds a valid pressure altitudeinput.Only approved devices may provide altitude to the GTX 327 in accordance with 14 CFR Part 91.217. Inaddition, all altitude reporting devices installed in the aircraft must meet certification requirements of14 CFR Part 91.413. The installer must select an altitude reporting device that is a certified altitudesource for the particular aircraft.Altitude reporting equipment order of precedence:1) RS-232 Fuel/Air Data Computer (if configured W/ALT.)2) Parallel wire Gray Code input3) Shadin Altitude Serializer/Encoder4) Icarus Altitude Serializer/EncoderRefer to section 3.3.5 for the altitude data reporting configuration.2.6.2.5 Discrete InputsTable 2-8. Discrete Inputs Pin AssignmentsPIN NAME PIN NUMBER I/OEXTERNAL IDENT INPUT* 8 InEXTERNAL STANDBY SELECT* 16 InSQUAT SWITCH IN 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 INPUT (remote IDENT) is a momentary input. Refer to figure B4 on page 43 forthe squat switch interconnect and to sections 3.3.6.2. and 3.3.10 for the squat switch configuration.EXTERNAL STANDBY SELECT (remote STANDBY) is a momentary input used when two GTX 327systems are installed in an aircraft. Refer to Figure B4 on page 43 for the EXTERNAL STANDBYSELECT interconnect and to sections 3.3.10 for verifying external standby configuration.