190-01134-11
GMA 350/350c/350H/350Hc Installation Manual
Rev. J
Page 4-5
4.2 Power
4.2.1
Aircraft Power
4.3 Serial Data
4.3.1
RS-232
The RS-232 outputs conform to EIA Standard RS-232C with an output voltage swing of at least ±5V when
drawing a standard RS-232 load.
4.4 Lighting
.The GMA 350/350H can be configured to track a 28 Vdc or 14 Vdc lighting bus. The default
configuration assumes a 14 Vdc lighting bus. Refer to the GMA 350/350H Configuration Tool User’s
Guide (190-01349-00) for instructions on configuration.
Annunciator brightness is controlled by the photocell and is not affected by the lighting bus.
If the lighting bus input drops below 1.5 Vdc the backlight will track the photocell.
Table 4-3. Aircraft Power
Pin Name
Connector
Pin
I/O
AIRCRAFT POWER
J3502
8
In
AIRCRAFT POWER
J3502
9
In
POWER GROUND
J3502
10
--
POWER GROUND
J3502
11
--
Table 4-4. RS-232
Pin Name
Connector
Pin
I/O
RS-232 IN
J3502
17
In
RS-232 OUT
J3502
18
Out
Table 4-5. Lighting Bus
Pin Name
Connector
Pin
I/O
LIGHTING BUS IN HI
J3502
7
In
LIGHTING BUS IN LO
J3502
5
Out
