GTX 33 Installation Manual 190-00906-00
Page 4-4 Rev. F
4.2 Power Functions
Power Input requirements are listed in the following tables. The power-input pins accept 14/28 Vdc.
Switched Power Out is a power source available for devices such as a remote digital altitude encoder.
Refer to Figure D-1 and D-2 for power interconnections.
4.2.1 Aircraft Power
4.3 Temperature Inputs
Temperature function with pin assignments are shown for reference since the temperature function is
available in the GTX 33. In the Garmin Integrated Flight Deck system, temperature data is received from
the GIA 63 in RS-232 format.
Temperature function is provided for the external display system via input to the GTX 33 transponder. The
Temperature input is used for Outside Air Temperature (OAT) display and Density Altitude computations.
The type of temperature probe required is a current sensor type, such as a Garmin GTP 59 or an
AD590-KH or AD592 made by Analog Devices. The GTX 33 is not configurable for different types of
temperature sensors. The temperature-input specification is 1 micro amp per degree Kelvin (1 uA/°K).
Table 4-2. Aircraft Power
Pin Name Connector Pin I/O
AIRCRAFT POWER 1 P3301 21 In
AIRCRAFT POWER 1 P3301 42 In
AIRCRAFT POWER 2 P3301 56 In
AIRCRAFT POWER 2 P3301 60 In
SWITCHED POWER OUT P3301 62 Out
XPDR REMOTE POWER OFF P3301 54 In
POWER GROUND P3301 27 --
POWER GROUND P3301 43 --
SIGNAL GROUND P3301 51 --
SIGNAL GROUND P3301 58 --
Table 4-3. Temperature Inputs
Pin Name Connector Pin I/O
CURRENT TEMPERATURE PROBE OUT P3301 41 Out
CURRENT TEMPERATURE PROBE IN P3301 44 In
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