Garmin G3X Installation Manual page 369

23.16.3 Aircraft Power
Power input requirements are listed in the following tables. The power input pins accept 14/28 Vdc. Refer
to Figure C-1 and C-2 for power interconnections. AIRCRAFT POWER 1 and AIRCRAFT POWER 2 are
"diode ORed" to provide power redundancy.
AIRCRAFT POWER 1
AIRCRAFT POWER 1
AIRCRAFT POWER 2
AIRCRAFT POWER 2
POWER GROUND
POWER GROUND
23.16.4 Discrete Functions
23.16.4.1 Discrete Outputs
External suppression should be connected if a DME or TCAS is installed in the aircraft avionics system.
The GTX 23 suppression I/O pulses may not be compatible with all models of DME or TCAS. Known
incompatible DME units include the Bendix/King KN 62, KN 64 and KNS 80. These models have an
output-only suppression port and can be damaged by the GTX 23 mutual suppression output. In this case,
do not connect the GTX 23's suppression pin to the incompatible unit's suppression pin; however, do
connect the GTX 23's suppression pin to any other compatible unit's suppression pin.
EXTERNAL SUPPRESSION I/O (TXP/DME)
23.16.4.2 Discrete Inputs
Sink current is internally limited to 200 uA max for a grounded input
EXTERNAL IDENT SELECT (remote IDENT) is a momentary input. When grounded, it activates the
IDENT pulse for 18 seconds in Mode A replies.
EXTERNAL STANDBY SELECT (remote STANDBY) is not a momentary input. When EXTERNAL
STANDBY SELECT is grounded, the GTX 23 operates in standby mode. In this mode, the transponder
will not squitter or reply to interrogations.
TIS CONNECT SELECT is a momentary input. When grounded, it toggles whether TIS-A is in standby
or operating.
EXTERNAL IDENT SELECT*
EXTERNAL STANDBY SELECT*
TIS CONNECT SELECT
*Inactive State: 10  Vin  33 Vdc or Rin 100 kΩ, Active State: Vin  1.9 Vdc with  75 uA sink current, or Rin  375 Ω
190-01115-01
Rev. AA
Pin Name
Pin Name
Pin Name
G3X/G3X Touch Installation Manual - LRU Pinouts
Connector Pin
J2301 21
J2301 42
J2301 56
J2301 60
J2301 39
J2301 58
Connector Pin
J2301 31
Connector Pin
J2301 12
J2301 13
J2301 46
Page 23-78
I/O
In
In
In
In
--
--
I/O
I/O
I/O
In
In
In