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3GSD 21 Sonar Module
INSTALLATION INSTRUCTIONS
CANet Wiring for the Garmin GSD 21
Notes:
1. Power and ground wires require 18 AWG. You can extend the CANet wiring of the GSD 21 power/data cable up to 80 ft (24.38 m) total length using the
CANet Connections Kit.
2. The CANet Extension Cable can support a maximum of two display units and one sonar unit.
3. The maximum length of cable from the CANet Extension Cable to the sonar or display units is 6 ft.
4. Refer to the chartplotter’s installation instructions for wiring the GPS 17 sensor and other devices.
5. Ground the drain wire at the first display unit. Do not ground the drain wire on the subsequent display units or sonar unit.
6. The CANet Extension Cable Black wire is reserved for future use. When inserting a CANet unit on the CANet Extension Cable, reconnect all wires according
to their color.
7. When crimping the 3-wire connector, use a standard pair of pliers and make sure the button is fully depressed into the connector.
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GARMIN GSD 21
SOUNDER MODULE
BLACK
ORANGE
GREEN
WHITE
CANet
Terminator
CANet
Terminator
CANet
Extension Cable
RED
BLACK
FUSE
2A
TO
TRANSDUCER
BLACK
DRAIN
ORANGE
GREEN
WHITE
BATTERY
10-35 VOLTS DC
See the CANet Terminator
Connection Diagram Below
CANet
Unit
CANet
Unit
CANet
Unit
The CANet Extension Cable can be cut to any length
1 ft to 80 ft and a CANet compatible device can be
inserted on the cable at any point between the two CANet
Terminators.
CANet CANet
Multiple CANet Unit Connection
CANet Terminator Connection
CANet Terminator
Green
White
Green
3 wire connector
3 wire connector
Green
White
White
To Sounder
To Chartplotter