GPS 155XL/GNC 300XL Installation Manual
Page 1-3
190-00067-22
Revision F
J101 Connector Pin Functions (37-pin) continued
Pin(s) Pin
Function
ARINC 429 Input A & B
(Pins 32 and 33)
Input capable of receiving data from ARINC 429 (low speed)
devices as listed in Section 4.
B,-, Charge Enable
(Pins 30, 34, and 29)
Connection for Garmin remote battery accessory.
1.2.5
J102 Connector Pin Functions (26 pin)
Pin(s) Pin
Function
MIC Audio Hi and Lo
(Pins 2 and 3, GNC 300XL Only)
Input requiring 275mV RMS into 470 ohm load (Standard
carbon or dynamic MIC containing transistorized
pre-amp).
MIC Key
(Pin 4, GNC 300XL Only)
Input, when grounded, keys the transmitter.
COMM Audio Hi and Lo (Pins 5
and 6, GNC 300XL Only)
Output capable of driving a 500-ohm load with 100mW.
MIC Intercom
(Pin 8, GNC 300XL Only)
Input requiring 125 mV RMS into 470 ohm load (Standard
carbon or dynamic MIC containing transistorized
pre-amp).
Remote Transfer
(Pin 10, GNC 300XL Only)
Input, when grounded, swaps the active and standby
COMM frequencies.
TX Interlock
(Pin 12, GNC 300XL Only)
Input, when grounded, reduces receiver sensitivity so
squelch will not break when another transceiver is keyed.
Altimeter input
(Pins 14-24)
Capable of receiving encoded output data from any
parallel altimeter device.
Remote Enter
(Pin 26)
Input, when ground, functions the same as the enter key
on the GPS 155XL/GNC 300XL front panel.
Sequence Hold Low
(Pin 13)
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.
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( ).
