Garmin NMEA 2000 Technische Referenz - Seite 10

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When the NMEA 2000 network is redesigned with the power source in the center, calculate the voltage drop in

both directions. If the T-connector to which you connect the power source is connected directly to another T-

connector (as shown in this example), use the LEN from the device connected to that T-connector as part of

the calculation for both directions.

Voltage Drop to the Left of the Power Connection

Resistance

0.053

Voltage Drop to the Right of the Power Connection

Resistance

0.053

Power Isolation

Some NMEA 2000 devices, such as a boat engine, provide power to the NMEA 2000 network. In some cases,

this may be sufficient to provide the appropriate power to the network, but in other cases this may result in

providing power to the network in two places, and could result in unexpected behavior or may damage other

connected devices.

To accommodate two power connections to the network, you can install a power isolator (010-11580-00) in the

backbone to when connecting devices to the network that also provide power. The power isolator allows data

communication, but does not allow power to pass through.

Middle-Powered NMEA 2000 Network Designed Correctly

Drop cable

Length = 2 m

Power cable

Length = 2 m

Drop cable

Length = 4 m

Drop cable

Length = 6 m

Backbone cable

Length = 10 m

Backbone cable

Length = 6 m

Distance

(2 + 10 + 2)

Distance

(2 + 6 + 4)

Load

(5 + 7)

0.1

Voltage drop

0.1

0.30 Vdc

0.1

Voltage drop

0.1

0.80 Vdc