
GTX 33 Installation Manual
190-00906-00
Page 1-4
Rev. F
1.6 Interface Summary
The GTX 33 provides the following interface connections via the rear connector. See Section 4 and
Appendix D for connection details.
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Ten (10) encoding altimeter inputs
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External IDENT input
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External STBY input (useful for dual transponder installations)
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External suppression pulse input
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Switched power output of up to 1.5 amps (for digital altitude encoder power)
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Aircraft power input (14/28 Vdc)
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Remote power turn on
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Serial airdata or GPS groundspeed input
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Serial altitude input (Reduces wire count vs. parallel wire gray code altimeter interface.)
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Software update input
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Supports Comm-A and Comm-B protocol
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Temperature, Altitude Hold and Density Altitude
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Digitally recorded voice and discrete warning annunciator activated by Altitude Hold when limits
are exceeded
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Diversity: GTX 33D is available with the diversity feature
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ARINC 429 input
The GTX 33 P/N 010-00267-() and GTX 33D 010-00294-() support the following list of Comm-B
Definition Subfield (BDS) registers:
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BDS (0,0) Air Initiated Comm-B (AICB).
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BDS (1,0) Data Link Capability Report.
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BDS (1,7) Common Usage Ground Initiated Comm-B (GICB) Capability Report.
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BDS (1,8) Mode S Specific Services GICB Capability Report.
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BDS (1,9) Mode S Specific Services GICB Capability Report.
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BDS (1,D) Mode S Specific Services Protocols (MSP) Capability Report.
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BDS (2,0) Aircraft Identification.
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BDS (4,0) Selected Vertical Intention
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BDS (5,0) Track and Turn Report
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BDS (6,0) Heading and Speed Report
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BDS (0,6) Extended Squitter surface Position
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BDS (0,5) Extended Squitter Airborne Position
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BDS (0,8) Extended Squitter Aircraft Identification and Category
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BDS (0,9) Extended Squitter Airborne Velocity – Subtypes 1 and 3
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BDS (0,A) Extended Squitter Event Driven Data
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BDS (6,1) Emergency/Priority Status
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BDS (6,5) Aircraft operational Status
Summary of Contents for GTX 33
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