GRT Avionics Trig TT21 Owner's manual

Trig TT21/TT22 Transponder– Remote Mount for HXr
Equipment Supplement
Revision A
1-Dec-2012

TRIG TT21 / TT22 Supplement GRT Avionics
TT22-2 Revision A
Table of Contents
Section 1: Introduction
1.1
About the Trig TT21/TT22……………………………………………………………………………………….. 3
1.2
Data Port and Hardware Requirements……………………………………………………………………
3
Section 2: Installation & Wiring
2.1
Suggested Connections……………………………………………………………………………………………
4
2.2
Worksheet: My System……………………………………………………………………………………………..
4
2.3
Mechanical Installation…………………………………………………………………………………………… 4
Figure 2-1: Mounting Tray & Overall Dimensions…………………………………………………..
5
Figure 2-2: Trig Adapter Dimensions………………………………………………………………………. 6
Figure 2-3: TT21/TT22 with GRT Trig Adapter Photos…………………………………………….. 7
Figure 2-4: Sample HXr Wiring Diagram………………………………………………………………….
8
Figure 2-5: GRT Trig Adapter Wiring Diagram…………………………………………………………
9
Section 3: Setup & Programming
3.1
Display Unit & Transponder Setup…………………………………………………………………………..
10
3.2
Post-Installation Checkout……………………………………………………………………………………….
11
Section 4: Pilot’s Guide Supplement
4.1
Remote User Interface…………………………………………………………………………………………….. 13
4.2
Changing Squawk Code………………………………………………………………………………………….. 14
4.3
IDENT Function……………………………………………………………………………………………………….. 14

Revision A TT22-3
GRT Avionics TRIG TT21 / TT22 Supplement
Section 1: Introduction
1.1 About the Trig TT21/TT22
The Trig TT21 and TT22 transponder is uniquely useful to HXr users because it is able interface with
the EFIS remotely, eliminating the need for a separate control head on the instrument panel. This
supplement is designed to help you connect the transponder to the HXr display unit and program
it to allow optimal performance of both units.
Download the current installation manual appropriate for your model of transponder from the Trig
website and follow all instructions thoroughly. This supplement does not cover items such as
antenna installation and power requirements for the transponder.
The interface between this transponder and the HXr allows for:
ŸRemote mounting, saving space on the panel and providing a clean, integrated design
ŸCertified Mode S with 1090-ES/ADS-B Out Support
ŸAvailable as Class 1, 250-watt output (TT22) or Class 2, 130-watt output (TT21)
1.2 Data Port and Hardware Requirements
Adapter Module
The Trig transponder requires an adapter module to interface remotely with the HXr. The Single
Control adapter allows one display unit to interface with the transponder. The Dual Control adapter
allows two display units to interface with it. (Controlling functions for the transponder do not travel
across the Inter-Display Link.) Contact GRT Avionics to order the adapter. The part numbers are:
TRIG-ADPT-SC GRT Trig Adapter, Single Control
TRIG-ADPT-DC GRT Trig Adapter, Dual Control
Required Data Ports
Suggested serial ports coincide with HXr Interconnect Diagram WD-1010-01, Figure 2-4.
Encoder Information
The Trig transponder has an altitude encoder built into the control head. Because this installation
does not use the Trig control head, you will use the altitude encoding function of the HXr system.
Required Display Unit Data Port Suggested Assignment
Serial Port IN Serial 7 IN
Serial Port OUT Serial 7 OUT

TRIG TT21 / TT22 Supplement GRT Avionics
TT22-4 Revision A
Section 2: Installation & Wiring
2.1 Suggested Connections
For more information on Display Unit pins and connectors, see Pinout Diagrams in the Appendix
of the HXr Installation Manual. See Figures 2-4 and 2-5 of this supplement for transponder and
adapter wiring diagrams.
“Own-Ship” Traffic Suppression
Pin 18 on the Trig adapter will prevent the transponder from transmitting while the onboard ADS-B
receiver is receiving. This prevents the “shadow” of your own aircraft from popping up in the Traffic
Warning screen on the EFIS. Not all ADS-B receivers support Suppression; see the wiring details of
your ADS-B receiver for more information.
2.2 Worksheet: My System
You may use this form to make a record of your own serial port & wiring choices.
2.3 Mechanical Installation
Keep the Trig at least 2 feet away from the aircraft magnetometer; otherwise, it may be mounted
anywhere that is convenient and complies with instructions in the Trig installation manual.
Display
Unit Pin
Display Unit
Function Trig Adapter Pin Trig Function
B22 Serial 7 Out Pin 2, Channel 1 Display Encoder & Command Data
B23 Serial 7 In Pin 3, Channel 1 Display Traffic & Status Data
N/A N/A Pin 12, Ground 1 Choose & run a minimum of two ground wires from
Trig to aircraft ground.
N/A N/A Pin 14, Ground 2
N/A N/A Pin 15, Power Input Unit power, 11-33V DC
N/A N/A Pin 18 Suppression
Display
Unit Pin Display Unit Port Trig Adapter Pin
Wire Color
Notes
Serial _______ Out Pin 2, Channel 1 Display
Serial _______ In Pin 3, Channel 1 Display
N/A N/A Pin _______, Ground 1
N/A N/A Pin _______, Ground 2
N/A N/A Pin 15, Power Input
N/A N/A Pin 18, Suppression

Revision A TT22-5
GRT Avionics TRIG TT21 / TT22 Supplement
M760REM Rev A.cdr
Trig TT21/22 Remote Transponder Mounting Tray & Overall Dimensions
6.30
1.92
1.18
3.54 0.85
1.26
2.52
5.44
0.18
Note: Dimensions shown in inches.
Figure 2-1