Garmin GNC 420A Installation Manual page 43

4.7.2.3 COM AUDIO, VOR/ILS AUDIO
Pin Name
500 COM AUDIO HI
500 COM AUDIO LO
500 VOR/ILS AUDIO HI
500 VOR/ILS AUDIO LO
500 COM AUDIO and 500 VOR/ILS AUDIO each supply 100 mW into a 500
balanced outputs and the LO output must be connected.
500 COM AUDIO is the summation of the COM receiver audio, COM sidetone audio, and INTERCOM
MIC audio.
4.7.2.4 DISCRETE INPUTS
Pin Name
TRANSMIT INTERLOCK
COM REMOTE TRANSFER
VLOC REMOTE TRANSFER
These discrete inputs are considered active if either the voltage to ground is < 1.9 V or the resistance to
ground is < 375 . These inputs are considered inactive if the voltage to ground is 11-33 V
COM REMOTE TRANSFER and VLOC REMOTE TRANSFER are momentary inputs.
4.7.3 COM/VOR/ILS Audio Configuration
None.
4.7.4 COM/VOR/ILS Audio Calibration and Checkout
Refer to section 5.2.11 for the COM calibration.
4.7.5 COM/VOR/ILS Audio Interconnect
Refer to Figure F-28 on page F-57 for the audio panel interconnect.
400 SERIES INSTALLATION MANUAL
190-00140-02
Connector Pin
P4002 7
P4002 19
P4006 16
P4006 17
Connector Pin
P4002 14
P4002 15
P4006 28
I/O
Out
Out
Out
Out
load. These are
I/O
In
In
In
.
DC
Page 4-15
Rev Q