User's Manual

TT21/TT22 Transponder Installation Manual 13 July 2009
00560-00 Issue AF
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Trig Avionics Limited Page 27
6. Installation Setup and Test
The TT21/TT22 uses a simple setup system to program important system
parameters, including the Mode S address. In the original factory
configuration, the setup screen is the first thing that runs when you switch on
the transponder. If the transponder has already been configured, and you want
to access the setup screen again, hold down the FN button while switching on
the transponder and the setup system will run.
The script will prompt for the following configuration items:
 Mode S Address
 VFR Squawk Code
 VFR Flight ID (Registration)
 Aircraft Maximum Airspeed
 Aircraft Category
 Squat switch source, if fitted
 GPS position source, if fitted, and ADS-B parameters
This setup mode also allows the recalibration of the altitude encoder.
All the programming is accomplished using the right hand rotary knob and the
ENT and FN buttons. Make all input selections using the rotary knob.
Pressing the ENT button accepts the current input and advances to the next
input item. Pressing the FN button moves directly to the next screen.
6.1 Configuration Items
6.1.1 Aircraft Address Programming
The Mode S Address is a 24 bit number issued to the aircraft by the
registration authority for the aircraft. These addresses are usually written as a 6
digit hexadecimal number, although you may also encounter one written as an