Garmin GDU 370 Installation Manual page 138

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.
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.
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 A
Pin Name
AIRCRAFT POWER 1
AIRCRAFT POWER 2
POWER GROUND
POWER GROUND
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
IN
I/O
OUT
OUT
OUT
I/O
OUT
I/O
G3X Installation Manual – Pinouts
190-01115-01
IN
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IN
IN