Garmin G3X Installation Manual page 194

A.3.3 Power I/O
A.3.3.1 Aircraft Power
The GSU 73 has four inputs for aircraft power bus inputs of 14/28Vdc. AIRCRAFT POWER 2 is for
connecting to an alternate power source, such as on aircraft with two electrical buses.
Pin Connector
47 P731
49 P731
59 P731
61 P731
A.3.3.2 Transducer Output Power
The GSU 73 supplies output power for engine/airframe sensors that may require supply voltage
excitation. The GSU 73 outputs voltage levels of +5, +10, and +12 Vdc, these outputs may be spliced to
allow connection to multiple sensors if needed. Max current specs are listed in the following table.
Power Supply Output
+5VDC Transducer Power Out
+10VDC Transducer Power Out
+12VDC Transducer Power Out
Pin Connector
55 P732
56 P732
58 P732
57 P732
75 P732
74 P732
A.3.3.3 Magnetometer Power
The GSU 73 outputs supply voltage to the GMU 44 via pins 38 & 39.
Pin Connector
38 P731
39 P731
A.3.4 GSU System ID Program
Pins 4 & 5 must be left open (floating) for proper G3X configuration.
Pin Connector
4 P731
5 P731
*Indicates Active Low
Page A-10
Revision E
Pin Name
AIRCRAFT POWER 1
AIRCRAFT POWER 2
POWER GROUND
POWER GROUND
Maximum Continuous Output Current
Pin Name
+12VDC TRANSDUCER POWER OUT
TRANSDUCER POWER OUT LO (GROUND)
+10VDC TRANSDUCER POWER OUT
TRANSDUCER POWER OUT LO (GROUND)
+5VDC TRANSDUCER POWER OUT
TRANSDUCER POWER OUT LO (GROUND)
Pin Name
MAGNETOMETER POWER OUT
MAGNETOMETER GROUND
Pin Name
GSU SYSTEM ID PROGRAM* 1
GSU SYSTEM ID PROGRAM* 2
I/O
125 mA
100 mA
150 mA
I/O
OUT
OUT
OUT
I/O
OUT
I/O
G3X Installation Manual – Pinouts
190-01115-01
IN
IN
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IN
IN