190-01879-11
GMA 245/245R Installation Manual
Rev. 6
Page 4-10
4.6.9 Speaker Audio Out
Do not connect the LO of the speaker to the aircraft chassis. Two wires must be connected from the GMA
to the Speaker for the HI and LO signals. If speaker LO is connected to the aircraft chassis ground, the
speaker will contain more noise than if connected back to the GMA source connections.
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
40
J2401
PASS HEADSET AUDIO
OUT LEFT
Passenger Headset Audio Output
OUT
41
J2401
PASS HEADSET AUDIO
OUT RIGHT
OUT
42
J2401
PASS HEADSET AUDIO
OUT LO
--
Table 4-14 Speaker Audio Output
Pin
Connector
Pin Name
Description
I/O
43
J2402
SPEAKER AUDIO OUT LO
Speaker Audio Output Ground
Reference
--
44
J2402
SPEAKER AUDIO OUT HI
Speaker Audio Output Hi
OUT
Table 4-15 Discrete Inputs
Pin
Connector
Pin Name
Description
I/O
16
J2401
PILOT ICS KEY*
Discrete Input
IN
13
J2402
PASSENGER ICS KEY*
Discrete Input
IN
20
J2402
COM SWAP*
Discrete Input
IN
22
J2402
PLAY KEY*
Discrete Input
IN
30
J2402
COPILOT ICS KEY*
Discrete Input
IN
*Denotes Active Low (Inputs: ground to activate)
Table 4-16 Discrete Outputs
Pin
Connector
Pin Name
Description
I/O
24
J2401
COM ACTIVE OUT*
Discrete Out
OUT
*Denotes Active Low (Grounded when active)
Table 4-13 Headset Outputs
Pin
Connector
Pin Name
Description
I/O
