Bedienungsanleitung Garmin GMI 20 (Seite 2 von 4) (Englisch)

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Connection Considerations

The marine instrument connects to power and to data sources

through a NMEA 2000 network. In addition, the marine

instrument can connect to a NMEA 0183 data source using a

data cable (not included).

NMEA 2000 Connection Considerations

NOTICE

If you are connecting this device to an existing NMEA 2000

network, the NMEA 2000 network should already be connected

to power. Do not connect the NMEA 2000 power cable to an

existing NMEA 2000 network, because only one power source

should be connected to a NMEA 2000 network.

If you are connecting this device to an existing NMEA 2000

network or engine network by another manufacturer, you should

install a NMEA 2000 Power Isolator (010-11580-00) between

the existing network and the Garmin devices.

If you are installing a NMEA 2000 power cable, you must

connect it to the boat ignition switch or through another in-line

switch. NMEA 2000 devices will drain your battery if the NMEA

2000 power cable is connected to the battery directly.

The marine instrument connects to a NMEA 2000 network on

your boat. The NMEA 2000 network provides power to the

marine instrument and data from NMEA 2000 devices such as a

wind sensor. The included NMEA 2000 cables and connectors

allow you to either connect the device to your existing NMEA

2000 network or create a basic NMEA 2000 network if needed.

If you are unfamiliar with NMEA 2000, you should read the

“NMEA 2000 Network Fundamentals” chapter of the Technical

Reference for NMEA 2000 Products. To download the

reference, go to www.garmin.com/manuals.

Item Description

Wind sensor

Marine instrument

Ignition or in-line switch

NMEA 2000 power cable

Item Description

NMEA 2000 drop cable

12 Vdc power source

NMEA 2000 terminator or backbone cable

NMEA 2000 T-connector

NMEA 2000 terminator or backbone cable

NMEA 0183 Connection Considerations

• The marine instrument can receive NMEA 0183 data from

one device using a NMEA data cable (not included), but it

cannot transmit data from the NMEA 0183 device to the

NMEA 2000 network.

• If you are replacing a legacy Garmin marine instrument that

currently uses a NMEA data cable, you do not need to

purchase a new data cable, but you might need to replace

the quarter-turn locking ring with a threaded locking ring. See

your local Garmin dealer or www.garmin.com for more

information.

• The installation instructions provided with your NMEA 0183

compatible device should contain the information you need to

identify the transmitting (Tx) A (+) and B (-) wires.

• When connecting NMEA 0183 devices with two transmitting

wires, it is not necessary for the NMEA 2000 bus and the

NMEA 0183 device to connect to a common ground.

• When connecting a NMEA 0183 device with only one

transmitting (Tx) wire, the NMEA 2000 bus and the NMEA

0183 device must connect to a common ground.

• For extended runs, you should use at least 0.33 mm

(22 AWG) wire.

• You must solder and seal all connections with heat-shrink

tubing.

Wire Color Wire Function

Red A red wire is present only on some variations of the data

cable, and should not be connected.

Black Accessory (-). This wire is used only when connecting the

marine instrument to a Garmin HVS GPS antenna.

Yellow Accessory (+). This wire is used only when connecting the

marine instrument to a Garmin HVS GPS antenna.

Blue Tx/A (+). This wire is used only when connecting the

marine instrument to a Garmin HVS GPS antenna.

White Tx/B (-). This wire is used only when connecting the

marine instrument to a Garmin HVS GPS antenna.

Brown Rx/A (+)

Green Rx/B (-)

NMEA 0183 Connection Diagrams

This diagram is an example of a connection to a standard NMEA

0183 device with two Tx wires.

Item Description

Marine instrument with a NMEA data cable (not included)

12 Vdc power source

NMEA 0183-compliant device

Item Garmin Wire

Function

Garmin Wire

Color

NMEA 0183 Device

Wire Function

N/A N/A Power

N/A N/A Data ground

2 GMI 20 Installation Instructions

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