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

TRIG TT21 / TT22 Supplement GRT Avionics
TT22-6 Revision A
Figure 2-1: Trig Adapter Dimensions
2.22
1.66
.64
HOUSING
HEX STANDOFF
SCREW
PRESSURE PLATE
TRIG ADAPTER PHYSICAL SPECIFICATIONS
HOUSING: ABS PLASTIC, UL94V-0 RATED
COLOR: GRAY
HARDWARE SUPPLIED:
ŸFOUR 4-40 UNC-2A SCREWS ŸTWO 4-40 UNC-2B HEX STANDOFFS ŸFOUR PRESSURE PLATES
HOUSING CONTAINS STANDARD 25-POSITION D-SUB CONNECTOR NOTE: HALF COVERS SNAP TOGETHER SECURELY , CAPTIVATING D-SUB CONNECTORS Figure 2-2: Trig Adapter Dimensions

Revision A TT22-7
GRT Avionics TRIG TT21 / TT22 Supplement
Figure 2-3: Trig TT21/22 with GRT Trig Adapter (not to scale)

TRIG TT21 / TT22 Supplement GRT Avionics
TT22-8 Revision A
Figure 2-4: Sample HXr Wiring Diagram

Revision A TT22-9
GRT Avionics TRIG TT21 / TT22 Supplement
Figure 2-5: GRT Trig Adapter Wiring Diagram

TRIG TT21 / TT22 Supplement GRT Avionics
TT22-10 Revision A
Section 3: Setup & Programming
3.1 Display Unit & Transponder Setup
1. After the display unit and transponder are installed and wired, use the following procedure to
program the display unit to communicate with the Trig. Note that in the system, the term “TT22”
refers to both the TT22 and TT21 transponder units.
2. From the home screen, press the MORE soft key, then the SET MENU soft key. Turn the lower
right knob to place the cursor bar over General Setup, then press the knob to select it and go to
the General Setup menu.
3. Turn the lower right knob to highlight the Settings of the serial port that you wired to the
transponder. Enter the Values shown below.
4. When you choose “TT22” as the value for Input or Output of a serial port, the label “TT22” will
appear at the top of the General Setup screen. Highlight this and press the knob to activate the
TT22 Setup Menu. A long list of Settings and data counters will appear. Enter the Values as shown
below to program the transponder.
Set Menu Page Setting Value
General Setup Serial Port ____ Rate 9600
General Setup Serial Port ____ Input TT22
General Setup Serial Port ____ Output TT22
Setting Value Notes
Flight ID Enter aircraft registration number Push knob, use soft keys to enter ID
Mode S Address Mode S code assigned to registration no. Push knob, use soft keys to enter ID
Squat Switch Choose when squat switch is closed (“low”); operates ground & flight modes automatically
Aircraft Category Choose closest value For ADS-B OUT data
Speed Category Choose closest value (cruise speed in knots) For ADS-B OUT data
Aircraft Width Choose closest value (in meters) For ADS-B OUT data
Aircraft Length Choose closest value (in meters) For ADS-B OUT data
VFR ID Enter aircraft registration number For ADS-B OUT data
GPS Input NMEA0183* Format of GPS feeding ADS-B OUT signal
GPS/TIS Rate 4800* Use 57600 for GRT RAIM GPS
GPS Integrity Low: VFR/Uncertified* GRT GPS is WAAS-capable, but not TSO’d.

Revision A TT22-11
GRT Avionics TRIG TT21 / TT22 Supplement
3.2 Post-Installation Checkout
Verify Device Communications
On the top and bottom of the TT22 setup menu, there are several communication counters that
make it easy to see if data is crossing between the transponder and EFIS. Check that data is flowing
between the display unit, adapter, TT22, and GPS.
At the bottom of the TT22 setup menu, the transponder’s Mode and Last Reply Count are visible
for in-flight troubleshooting. The Transponder Versions and Adapter Software Version fields display
the version of the software in both the transponder and adapter.
Update Adapter Software
Software comes pre-installed in the Trig Adapter. Like the Display Unit and AHRS, periodic updates
of this software may be necessary. Load software to the adapter in the same way that you update
software on the Display Unit. If new software is available, it will be available for free download from
GRTavionics.com, on the Support/Software page. To update software:
1. Click the link and save the new software file(s) onto the root directory of a USB memory stick.
(NOTE: “Root directory” means the file is not inside a file folder on the thumb drive, but visible
as soon as you open the thumb drive on your computer. The EFIS does not look inside folders
to find files that it needs, but picks them off the main directory file list.) Do not rename the files
when you save them.
2. With the display unit powered OFF, plug the memory stick into a USB port in the display unit that
the TT22 is wired to.
3. Turn ON the display unit and access the Set Menu page, followed by the TT22 setup menu.
4. Select Load Adapter Software and press the knob. Answer YES, you are sure. The software will
load onto the Trig adapter automatically from there. The system will reboot itself after loading
the new software.
5. Once the system reboots, you may remove the USB memory stick from the display unit.
Setting Value Notes
Test Squitters Choose
TIS Output Trig TIS Traffic (typical) Traffic Information Service (Mode S Traffic) Primary Source
ADS-B Receiver In
Aircraft Choose Yes or No See www.GRTavionics.com for recommended ADS-B receivers.
*Use this Value with a non-RAIM GRT GPS module. If using a different GPS wired to TT22, enter value for that GPS.
(For example, NexNav Mini complies with TSO-C145c and “2020 ADS-B Out” rule. )

TRIG TT21 / TT22 Supplement GRT Avionics
TT22-12 Revision A
Transponder Testing & Certification
Consult the Trig TT21/TT22 installation manual for testing information. The transponder installation
must be certified before use in flight.

Revision A TT22-13
GRT Avionics TRIG TT21 / TT22 Supplement
Section 4: Pilot’s Guide Supplement
4.1 Remote User Interface
The TT22 remote transponder is controlled in flight through the HXr Display Unit interface. Figure
4-1 shows the HXr screen with the Transponder controls activated.
To activate the Transponder Control Panel:
1. Press the topmost softkey on the right side of the bezel to move the green cursor box inside
the Avionics Inset in the upper right corner of the screen. Press repeatedly until the XPDR
window is highlighted. This brings up the three softkey labels along the vertical control panel:
1200, CODE, and IDENT.
2. Press the upper knob, labeled “CODE,” to activate the squawk code digit softkeys along the
horizontal control panel at the bottom of the screen and a small window that displays the
new code as it is entered.
Figure 4-1: HXr Transponder Control Panel

TRIG TT21 / TT22 Supplement GRT Avionics
TT22-14 Revision A
4.2 Change Squawk Code
The HXr defaults to the U.S. VFR squawk code of 1200. To change it:
1. Activate Transponder Control Panel as described in 4.1.
2. Press Upper Knob once to activate the squawk code digit softkey labels along the bottom of
the screen and the small Code Entry window next to the knob.
3. Enter new squawk code using the softkeys. The digits appear inside the small Code Entry
window next to the Upper Knob as you enter them. Then:
a. To activate the new code, press ENTER softkey or Upper Knob.
b. To restart code entry after an error, press the Right Knob to CLEAR.
c. To cancel code entry, press CANCEL softkey.
4. To quickly change from a discreet squawk code to back to VFR, press the 1200 softkey when
the Transponder controls are active.
4.3 IDENT Function
1. Activate Transponder Control Panel as described in 4.1 if it is not already active.
2. Press IDENT softkey on the Horizontal control panel.