Garmin GDU 370 Installation Manual page 140

A.3.5.3 RS-485 Input
The GSU 73 contains one channel of RS-485 serial data communications.
Pin Connector
1 P731
2 P731
A.3.5.4 CAN Bus
This data bus conforms to the BOSCH standard for Controller Area Network 2.0-B. This bus complies
with ISO 11898. CAN BUS TERMINATION should be connected to CAN BUS LO if GSU is located at
the end of the bus.
Pin Connector
7 P731
8 P731
29 P731
A.3.5.5 Configuration Module Interface
Pin Connector
20 P732
39 P732
59 P732
78 P732
A.3.6 Discrete I/O
A.3.6.1 Active Low Discrete Inputs
The GSU 73 has 4 configurable discrete inputs conforming to:
a) Low: 0 VDC < Vin < 3.5 VDC, OR Rin < 375 ohms (active)
b) High: 8 VDC < Vin < 36 VDC, OR Rin> 100k ohms (inactive)
Pin Connector
9 P731
10 P731
11 P731
12 P731
* Indicates Active Low
Page A-12
Revision A
Pin Name
MAGNETOMETER RS-485 IN B
MAGNETOMETER RS-485 IN A
Pin Name
CAN BUS HI
CAN BUS LO
CAN BUS TERMINATION
Pin Name
CONFIG MODULE CLOCK
CONFIG MODULE DATA
CONFIG MODULE POWER OUT
CONFIG MODULE GROUND
Pin Name
DISCRETE IN* 1
DISCRETE IN* 2
DISCRETE IN* 3
DISCRETE IN* 4
I/O
IN
IN
I/O
I/O
I/O
I/O
OUT
I/O
OUT
I/O
IN
IN
G3X Installation Manual – Pinouts
190-01115-01
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IN
IN