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1.6 Interface Summary
The GTX 23 provides the following interface connections via the rear connector. See Section 4 and
Appendix C for connection details.
• External IDENT input
• External STBY input (useful for dual transponder installations)
• External mutual suppression pulse input/output
• Aircraft power input (14/28 Vdc)
• RS-232 input #1 connection for altitude and unit control data
• RS-232 output #1 connection for TIS and unit status
• RS-232 input #2 connection for GPS data for ADS-B
• Supports Comm-A and Comm-B protocol
• ARINC 429 outputs for TIS data
The GTX 23 supports the following list of Comm-B Definition Subfield (BDS) registers:
• BDS (0,0) Air Initiated Comm-B (AICB)
• BDS (1,0) Data Link Capability Report
• BDS (1,7) Common Usage Ground Initiated Comm-B (GICB) Capability Report
• BDS (1,8) Mode S Specific Services GICB Capability Report
• BDS (1,9) Mode S Specific Services GICB Capability Report
• BDS (1,D) Mode S Specific Services Protocols (MSP) Capability Report
• BDS (2,0) Aircraft Identification
• BDS (4,0) Selected Vertical Intention
• BDS (5,0) Track and Turn Report
• BDS (6,0) Heading and Speed Report
• BDS (0,6) Extended Squitter surface Position
• BDS (0,5) Extended Squitter Airborne Position
• BDS (0,8) Extended Squitter Aircraft Identification and Category
• BDS (0,9) Extended Squitter Airborne Velocity – Subtypes 1 and 3
• BDS (0,A) Extended Squitter Event Driven Data
• BDS (6,1) Emergency/Priority Status
• BDS (6,5) Aircraft operational Status
GTX 23 Installation Manual
190-00906-01
Page 1-3
Revision A
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