G900X/G950 Installation and Maintenance Manual – GTX 33
Page 8-3
190-00719-00
Revision D
8.1.3 Interface
Summary
The GTX 33 provides the following interface connections via the rear connector.
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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
The GTX 33 P/N 010-00267-( ) and 010-00294-( ) support the following list of Binary Data Selector
(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
