190-01878-02 GMA 342/345 Installation Manual
Rev. 5 Page 4-5
4.4 Lighting Bus
The GMA 342/345 can be configured to track a 14 or 28 Vdc lighting bus using these inputs. Refer to
Appendix C
for lighting interconnections.
Backlighting refers only to the lighting of the text labels on the front panel and is controlled by the inputs
in Table 4-4. The brightness of the LED annunciators that illuminate each key when selected is controlled
by a photocell that operates independently of the backlight input.
NOTE
If the lighting bus inputs are not connected, the backlighting will use the photocell.
4.5 RS-232
The RS-232 outputs conform to EIA Standard RS-232C with an output voltage swing of at least ±5V when
driving a standard RS232 load.
4.6 Audio Inputs/Outputs and Mic Keys
4.6.1 Mic Audio Inputs and Mic Keys
Table 4-4 Lighting Bus
Pin Connector Pin Name I/O
5 J3402 LIGHTING BUS 14V LO/28V LO --
6 J3402 LIGHTING BUS 14V HI/28V LO IN
7 J3402 LIGHTING BUS 14V HI/28V HI IN
Table 4-5 Lighting Bus
Pin Connector Pin Name I/O
17 J3402 RS-232 IN IN
18 J3402 RS-232 OUT OUT
Table 4-6 Mic Audio Inputs and Mic Keys
Pin Connector Pin Name Description I/O
34 J3401 PILOT MIC KEY* IN
Enables respective MIC audio into
the selected transceiver unit
IN
33 J3402 COPILOT MIC KEY* IN IN
33 J3401 PILOT MIC AUDIO IN HI
Pilot Mic audio input and ground
reference
IN
35 J3401 PILOT MIC AUDIO IN LO --
32 J3402 COPILOT MIC AUDIO IN HI
Copilot Mic audio input and ground
reference
IN
34 J3402 COPILOT MIC AUDIO IN LO --
35 J3402 PASS 1 MIC AUDIO IN HI
Passenger 1 Mic audio and ground
reference
IN
36 J3402 PASS 1 MIC AUDIO IN LO --
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