Marker Beacon Pin Assignments, J3472 - Garmin GMA 347 Installation Manual

4.3.4 Marker Beacon Functions
Marker Beacon connections are listed in the following table. The antenna input is connected to pins 78
(HI or Center Conductor) and 59 (LO or Shield).
Table 4-6. Marker Beacon Pin Assignments, J3472
Pin
34 MIDDLE MARKER SENSE
AIRWAY/INNER MARKER EXT
74
LAMP OUT
75 MIDDLE MARKER EXT LAMP OUT
76 OUTER MARKER EXT LAMP OUT
78 MARKER ANTENNA HI
59 MARKER ANTENNA LO
4.3.5 Installation Selection Inputs
The following table shows the Installation Selection Inputs of J3472. The selection inputs have an input
and a program ground. When the input is grounded, the input function is selected.
Table 4-7. Installation Selection Inputs Pin Assignments, J3472
Pin Pin Name
4 RECORDER PLAY*
5 PROGRAM GROUND
17 COM SWAP*
18 PROGRAM GROUND
24 RECORDER OFF SELECT*
25 PROGRAM GROUND
26 AUXILIARY SOURCE SELECT*
65 TEL DISCRETE RINGER*
* Denotes Active Low (Ground to activate).
Page 4-8
Revision A
Pin Name
An external pushbutton switch activates voice
recorder playback.
When enabled, COM 1 and COM 2 are
swapped. This is used with a switch tied to
ground for momentary operation.
When enabled, the voice recorder is disabled.
This input is used for an external switch tied to
ground to control the auxiliary audio.
This input is for use with a cellular phone with a
digital output.
Description
2.5-8 Vdc into 4.7 k
MKR I-HI white 2.5-8 Vdc into 56
MKR M-HI amber. 2.5-8 Vdc into
56
MKR O-HI blue. 2.5-8 Vdc into 56
Marker antenna input, 50
Ground reference for pin 78
Description
I/O
Out
Out
Out
Out
In
--
I/O
In
--
In
--
In
--
In
In
GMA 347 Installation Manual
190-00325-01