190-00207-02 GTX 330/330D Installation Manual
Rev. U Page 1-5
1.6 Interface Summary
The GTX 330 provides the following interface connections via the rear connector:
• Ten (10) encoding altimeter inputs.
• External IDENT input.
• External STBY input (useful for dual transponder installations).
• External suppression pulse input.
• Switched power output of up to 1.5 amps (for digital altitude encoder power).
• Aircraft dimming bus input voltage.
• Aircraft master switch turn-on option.
• Serial altitude or GPS groundspeed input.
• Serial altitude input. (Reduces wire count vs. parallel wire gray code altimeter interface.)
• Software update input.
• Supports Comm-A and Comm-B protocol.
• Temperature, Altitude Hold and Density Altitude.
• Digitally recorded voice and discrete warning annunciator activated by Altitude Hold when limits
are exceeded.
• Diversity: GTX 330 is available with or without the diversity feature.
The GTX 330 supports the following list of Binary Data Selector (BDS) registers:
• BDS (0,0) Air Initiated Comm-B (AICB)
• BDS (1,0) Data Link Capability Report
• BDS (4,0) Selected Vertical Intention (EHS Only)
• BDS (5,0) Track and Turn Report (EHS Only)
• BDS (6,0) Heading and Speed Report (EHS Only)
• 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 (0,5) Extended Squitter Airborne Position (ES Enabled Units Only)
• BDS (0,6) Extended Squitter Surface Position (ES Enabled Units Only)
• BDS (0,7) Extended Squitter Status Position (ES Enabled Units Only)
• BDS (0,8) Extended Squitter Aircraft Identification and Category (ES Enabled Units Only)
• BDS (0,9) Extended Squitter Airborne Velocity (ES Enabled Units Only)
• BDS (0,A) Extended Squitter Event Driven Information (ES Enabled Units Only)
• BDS (6,1) Emergency/Priority Status (ES Enabled Units Only)
• BDS (6,5) Aircraft Operational Status (ES Enabled Units Only)
BDS register information is presented for the installation agency to understand the functionality of the
GTX 330, and make a determination that the unit complies with the requirements of their civil aviation
authorities. No further wiring or configuration programming is required for the unit.
Note that BDS (3,0) is only required for transponders compatible with ACAS/TCAS II. The GTX 330
does not support BDS (3,0).
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