Electrical Specifications - Garmin GDU 370 Installation Manual

4.1.1 Features Summary
Air Data
Pressure Altitude
Density Altitude
Vertical Speed
Mach Number
Indicated Airspeed
True Airspeed
AHRS
Magnetic Heading
Pitch Angle
Roll Angle
Linear Accelerations
Pitch, Roll, Yaw Rotation Rates

4.2 Electrical Specifications

Characteristic
Input Voltage Range
Power Input
*Garmin recommends using a Mod 1level GSU 73 in aircraft that exclusively use a +28V supply.
Page 4-2
Revision A
Interfaces
CAN (1)
RS-232 (2 TX/2 RX)
ARINC 429 (4 RX/2 TX)
OAT Probe (GTP 59)
Magnetometer (GMU 44) (1 RS-232 TX/ 1 RS-485 RX)
Engine/Airframe
28 Analog inputs, including those allocated as per below:
Dedicated Ammeters (2)
Constant Current Source Capability (6)
Divider Circuits to handle large input voltages (12)
Frequency Counter Inputs (4)
Discrete I/O (4 In/2 Out)
Table 4-1. GSU 73 Supply Specifications
Specification
10-29 Vdc*
1.75 Amp @ 14 Vdc (Max)
0.80 Amp @ 28 Vdc (Max)
G3X Installation Manual – GSU 73
190-01115-01