Garmin GPSMAP 421/421s Technical Reference - Page 8

Browse online or download pdf Technical Reference for Marine GPS System Garmin GPSMAP 421/421s. Garmin GPSMAP 421/421s 42 pages. Marine navigation equipment
Also for Garmin GPSMAP 421/421s: Installation Instructions Manual (12 pages), Reference Manual (2 pages), Important Safety Information (48 pages), Installation Instructions Manual (28 pages), Template Manual (2 pages), Declaration Of Conformity (1 pages)

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Garmin GPSMAP 421/421s Technical Reference
NMEA 2000 Fundamentals
Linear Backbone Construction
Use the NMEA 2000 T-connectors to construct your NMEA 2000 backbone, and extend the backbone with appropriate lengths of backbone
cable if necessary. Use one T-connector per device. Use the sides of the T-connector to construct the backbone of the NMEA 2000 network, and
use the top of the T-connector to attach a NMEA 2000 device. By using only the sides of the T-connectors to construct the backbone, you create
a linear construction to your NMEA 2000 network. T-connectors can be separated by backbone cables or connected directly together.
Although the male and female connectors on the T-connectors and backbone cables will fit on all sides of a T-connector, it is very important to
use the top of the T-connector only to attach NMEA 2000 devices, not to attach other T-connectors or backbone cables.
To NMEA 2000 devices
and power
Female
terminator
Male
Backbone extension cable
terminator
Correct Linear Backbone Construction
To NMEA 2000 devices
and power
T-connector
installed incorrectly
Male
terminator
Male
Backbone extension cable
(also installed
terminator
incorrectly)
Incorrect Linear Backbone Construction
Technical Reference for Garmin NMEA 2000 Products