Garmin GMA 342 Installation Manual page 28

2.8.7 Hardwired Configuration Options
The configuration options in Table 2-10 are available by wiring the inputs to a pushbutton to ground (see
Figure C-2 and Figure C-3).
Connector Pin
PILOT ICS
J3401 16
KEY*
COM ACTIVE
J3401 24
OUT*
PASSENGER
J3402 13
ICS KEY*
J3402 20 COM SWAP*
J3402 22 PLAY KEY*
COPILOT ICS
J3402 30
KEY*
PA MODE
J3402 19
SELECTED*
J3402 12 PA MUTE OUT*
*Active Low
190-01878-02
Rev. 5
Table 2-10 Hardwire Configuration Options
Description Type
Input
Output
Input
Input
Input
Input
Output
Output
Function
If DIP switch 1 is on, this active low input, when
grounded, will allow microphone audio to the intercom
from Pilot MIC.
This output is active when Receiving selected COM
audio or when transmitting on the MIC selected COM.
This output can be used to connect to other devices to
inhibit other devices from playing audio into the
GMA 342/345 while there is COM activity.
If DIP switch 1 is on, this active low input, when
grounded, will allow microphone audio to the intercom
from Passenger MIC.
When grounded the MIC selected COM will swap. For
the GMA 345 3-COM unit, this cycle includes selection
of COM 3 MIC (1, 2, 3, 1, 2, 3, ...).
When grounded the last voice recorded message will
play. While playing, if grounded again, the previous
message will play.
If DIP switch 1 is on, this active low input, when
grounded, will allow microphone audio to the intercom
from Copilot MIC.
This output is active when the GMA 342/345 is in PA
mode.
This output is active when the GMA 342/345 is in PA
mode, and the Pilot or Copilot PTT is active.
GMA 342/345 Installation Manual
Page 2-12