User's Manual

TT21/TT22 Transponder Installation Manual 13 July 2009
00560-00 Issue AF
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Trig Avionics Limited Page 13
to limit the maximum operating temperature if the TT21/TT22 is installed in
close proximity to other avionics. The reliability of equipment operating in
close proximity in an avionics bay can be degraded if adequate cooling is not
provided.
5.5 TT21/TT22 Transponder Electrical Connections
The TT21/TT22 has a single 25 way female socket which provides the data
and power inputs to the transponder. A single TNC coaxial connector attaches
to the antenna.
5.5.1 TT21/TT22 Interface – Pinout
Pin
Signal
Direction
1
Ground
-
2
TMAP1A
Bidirectional
3
TMAP1B
Bidirectional
4
Ground
-
5
GPS Position In
Input
6
Ground
-
7
RS232 Out
Output
8
TMAP2A
Bidirectional
9
TMAP2B
Bidirectional
10
Ground
-
11
Controller Power
Output
12
Ground
-
13
Power ON
Input
14
Ground
-
15
11-33V DC
Input