TX56/56A and TX57/57A Installation Manual
5 April 2022
01776-00-01
Issue AD
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Page 20
Trig Avionics
5.4 Electrical Connections
The TX56 has a 25 way D-type connector which is used for all the Com radio
features, and a 44 way D-type connector used for the Nav receiver features.
One coaxial BNC connection is used to connect the Com antenna and one is
used for the Nav antenna.
5.4.1
Com Connector D-type
The pinout for the 25 way Com D-type is as follows:
Pin Signal
Direction
1
Speaker Out
Output
2
Headphone 1 Left Out
Output
3
Headphone 1 Right Out Output
4
Ground
-
5
Headphone 2 Left Out
Output
6
Headphone 2 Right Out Output
7
Mono Audio Out
Output
8
Lighting Bus In
Input
9
Ground
-
10
Transmit Interlock In
Input
11
RS232 Out
Output
12
RS232 In
Input
13
Aircraft Power (DC)
-
14
Aux Audio
Input
15
Music Audio Left In
Input
16
Music Audio Right In
Input