190-01878-02
GMA 342/345 Installation Manual
Rev. 5
Page 4-12
4.7 Discrete Inputs
The ICS KEYs are enabled by setting switch 1 of the DIP switch to ON. The COM Swap and Play key are
always enabled.
4.7.1 Discrete Outputs
4.8 Marker Beacon
Marker lamp outputs provide a variable DC voltage between 3V and 9V that drive incandescent lamps
(>56Ω). Lamp brightness is controlled by the photocell.
MIDDLE MARKER SENSE OUT has the same behavior as MIDDLE MARKER LAMP OUT, but with
half the voltage output into the rated minimum resistance of 4.7 kΩ.
Table 4-17 Discrete Inputs
Pin
Connector
Pin Name
Description
I/O
16
J3401
PILOT ICS KEY*
Discrete Input
IN
13
J3402
PASSENGER ICS KEY*
Discrete Input
IN
20
J3402
COM SWAP*
Discrete Input
IN
22
J3402
PLAY KEY*
Discrete Input
IN
30
J3402
COPILOT ICS KEY*
Discrete Input
IN
*Denotes Active Low (Inputs: ground to activate)
Table 4-18 Discrete Outputs
Pin
Connector
Pin Name
Description
I/O
24
J3401
COM ACTIVE* OUT
Discrete Out
OUT
12
J3402
PA MUTE* OUT
Discrete Out
OUT
19
J3402
PA MODE SELECTED*
Discrete Out
OUT
*Denotes Active Low (Grounded when active)
Table 4-19 Discrete Outputs
Pin
Connector
Pin Name
I/O
1
J3401
MARKER ANTENNA IN HI
IN
2
J3401
MARKER ANTENNA IN LO
--
36
J3401
INNER MARKER LAMP OUT
OUT
37
J3401
OUTER MARKER LAMP OUT
OUT
38
J3401
MIDDLE MARKER LAMP OUT
OUT
39
J3401
MIDDLE MARKER SENSE OUT
OUT
