trig TT31 - 6 Installation Setup and Test; Configuration Items; Aircraft Address Programming; VFR Squawk Code

TT31 Transponder Installation Manual 1 February 2010
00455-00 Issue AJ
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6. Installation Setup and Test
The TT31 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, simply hold down the FUNC 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
 TIS output format, if used
 Audio Output Volume
 LCD Dimming Settings
It will then run some simple installation diagnostics, including an external interface check, a check of
the altitude encoder interface, and a check of the lighting bus input.
All the programming is accomplished using the right hand rotary knob and the ENT, BACK and FUNC
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 BACK button allows you to change something
you have already entered. Pressing the FUNC 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 8 digit octal number. The TT31 only understands the hexadecimal format,
so you must first convert an octal number to hexadecimal.
Enter the 6 digit aircraft address using the rotary knob and the ENT button.
6.1.2 VFR Squawk Code
When the pilot presses the VFR button, a pre-programmed code will replace the current squawk code.
The code is set up next; the choice of code will depend on the normal location of the aircraft. In the
USA, the VFR squawk code is 1200. In most parts of Europe, the VFR squawk code should be set to
7000.
Enter the 4 digit squawk code using the rotary knob and the ENT button.
6.1.3 VFR Flight ID
The default Flight ID for an aircraft not on an IFR flight plan should be the aircraft registration. Enter
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