Garmin G3X Installation Manual page 334

23.6.4 RS-232 CHANNEL
The RS-232 outputs conform to EIA Standard RS-232C with an output voltage swing of at least ±5 V
when driving a standard RS-232 load. This channel is not used in typical G3X installations.
RS-232 RX
RS-232 TX
23.6.5 Lighting
The GI 260 display brightness can track either a 28 VDC or 14 VDC lighting bus using these inputs. If left
unconnected, unit will use a photocell to adjust lighting.
DC LIGHTING BUS
23.6.6 Mono Audio
MONO OUT provides audio alerts for connection to an unswitched input on an intercom or audio panel.
AUDIO SHIELD is grounded at the GI 260. If the audio lines in the GI 260 pigtail harness are not long
enough to connect directly to the audio panel, AUDIO SHIELD may be used to splice the shields together
on the audio lines. For other installations, the shields should be spliced together but the audio panel shield
should be left floating (Figure
connecting and terminating the shield.
MONO OUT
AUDIO GROUND
AUDIO SHIELD
190-01115-01
Rev. AA
Pin Name
Pin Name
24-1.5). Refer to the audio panel installation manual for further guidance on
Pin Name
G3X/G3X Touch Installation Manual - LRU Pinouts
Wire Color
YELLOW
BROWN
Wire Color
GRAY
Wire Color
WHITE
GREEN
BLACK HEAT SHRINK
I/O
IN
OUT
I/O
IN
I/O
OUT
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