Garmin GPS 155XL Installation Manual page 9

Pin(s)
ARINC 429 Input A & B
(Pins 32 and 33)
Battery +,-, Charge Enable
(Pins 30, 34, and 29)
1.2.5 J102 Connector Pin Functions (26 pin)
Pin(s)
MIC Audio Hi and Lo
(Pins 2 and 3, GNC 300XL Only)
MIC Key
(Pin 4, GNC 300XL Only)
COMM Audio Hi and Lo (Pins 5
and 6, GNC 300XL Only)
MIC Intercom
(Pin 8, GNC 300XL Only)
Remote Transfer
(Pin 10, GNC 300XL Only)
TX Interlock
(Pin 12, GNC 300XL Only)
Altimeter input
(Pins 14-24)
Remote Enter
(Pin 26)
Sequence Hold Low
(Pin 13)
1.2.6 Comm Antenna Connector (J4, GNC 300XL Only)
Capable of providing 5 watts, minimum, at 13.8V sensitivity of 6 dB SNR, minimum, at 2 uV hard. The
COMM antenna shall be approved to TSO C37( ) and C38( ).
GPS 155XL/GNC 300XL Installation Manual
190-00067-22
J101 Connector Pin Functions (37-pin) continued
Input capable of receiving data from ARINC 429 (low speed)
devices as listed in Section 4.
Connection for Garmin remote battery accessory.
Input requiring 275mV RMS into 470 ohm load (Standard
carbon or dynamic MIC containing transistorized
pre-amp).
Input, when grounded, keys the transmitter.
Output capable of driving a 500-ohm load with 100mW.
Input requiring 125 mV RMS into 470 ohm load (Standard
carbon or dynamic MIC containing transistorized
pre-amp).
Input, when grounded, swaps the active and standby
COMM frequencies.
Input, when grounded, reduces receiver sensitivity so
squelch will not break when another transceiver is keyed.
Capable of receiving encoded output data from any
parallel altimeter device.
Input, when ground, functions the same as the enter key
on the GPS 155XL/GNC 300XL front panel.
Input, when grounded, activates HOLD mode. See GPS
155XL Pilot's Guide (GPN 190-00067-20) or the GNC
300XL Pilot's Guide (GPN 190-00067-30) for more
information.
Pin Function
Pin Function
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Revision F