Serial Data; Lighting - Garmin G900X Installation And Maintenance Manual

A.8.3

Serial Data

A.8.3.1 RS-232
Pin Name
RS-232 OUT 1
RS-232 IN 1
RS-232 OUT 2
RS-232 IN 2
The RS-232 outputs conform to EIA Standard RS-232C with an output voltage swing of at least ±5V
when driving a standard RS-232 load.
A.8.4

Lighting

Pin Name
LIGHTING BUS HI
LIGHTING BUS LO
The GCU 476 can be configured to track a 28 VDC, 14 VDC, 5 VDC, or 5 VAC lighting bus using these
inputs. The GCU 476 can also automatically adjust for ambient lighting conditions based on photocell
input.
Page A-76
Revision D
G900X/G950 Installation and Maintenance Manual – Pinouts
Connector Pin
P4751 1
P4751 2
P4751 3
P4751 4
Connector Pin
P4751 11
P4751 12
190-00719-00
I/O
Out
In
Out
In
I/O
In
In