Garmin G3X Installation Manual page 360

23.13.7 Temperature Inputs
Temperature input is used for Outside Air Temperature (OAT) computations. The temperature input is a
three-wire temperature probe interface. OAT Power Out and OAT High are connected internally at the
OAT probe. A GTP 59 or other supported temperature probe is required for the GSU 73 installation. The
GTP 59 is a Resistive Temperature Device (RTD). Refer to
interconnect.
Pin Connector
15 J732
16 J732
35 J732
23.13.8 Frequency Counter Inputs
Digital inputs are low when the signal is ≤ 2 Vdc or the resistance to ground is ≤ 375 Ω, and high when the
signal is > 3.5 Vdc or the resistance to ground is > 100 kΩ.
Pin Connector
17 J732
19 J732
36 J732
38 J732
23.13.9 Fuel Select Outputs
If a resistive fuel level sensor is connected to the FUEL 1 or FUEL 2 inputs, the corresponding FUEL
SENSOR PULL-UP 1 or 2 pin must be connected to the +10 V TRANSDUCER POWER pin (58) for the
fuel level sensor to work properly. If using resistive fuel level sensors with the
GP 3/FUEL 3 or GP 4/FUEL 4 inputs, connect the high side of the input to +10 V power through a 1 kΩ
resistor, as shown in Section
Pin Connector
76 J732
77 J732
190-01115-01
Rev. AA
OAT PROBE IN HI
OAT PROBE POWER OUT
OAT PROBE IN LO
RPM
FUEL FLOW
CAP FUEL 1 / RPM 2
CAP FUEL 2 / FUEL FLOW 2
27.
FUEL SENSOR PULL-UP 2 (FUEL 2)
FUEL SENSOR PULL-UP 1 (FUEL 1)
Figure 18-2 for the temperature probe
Pin Name
Pin Name
Pin Name
G3X/G3X Touch Installation Manual - LRU Pinouts
I/O
IN
OUT
IN
I/O
IN
IN
IN
IN
I/O
OUT
OUT
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