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Wire Color Wire Function
White
Tx/B (Out -). This wire is used only when connecting the
marine instrument to a Garmin HVS GPS antenna.
Brown
Rx/A (In +)
Green
Rx/B (In -)
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)
Power source
NMEA 0183 compliant device
Item Garmin Wire
Function
N/A
N/A
Rx/A (In +)
Rx/B (In -)
This diagram is an example of a connection to a standard NMEA
0183 device with one Tx wire.
Item Description
Marine instrument with a NMEA data cable (not included)
NMEA 2000 network (must connect to the same ground as the
NMEA data cable)
Power source
NMEA 0183 compliant device
Item Garmin Wire Function Garmin Wire
N/A
N/A
Rx/B (In -)
Rx/A (In +)
This diagram is an example of a connection to a Garmin HVS
GPS antenna.
GNX 20/21 Installation Instructions
Garmin Wire
NMEA 0183 Device
Color
Wire Function
N/A
Power
N/A
Data ground
Brown
Tx/A (Out +)
Green
Tx/B (Out -)
NMEA 0183 Device
Color
Wire Function
N/A
Power
N/A
Power ground
Green
Data ground
Brown
Tx
Item Description
Marine instrument with a NMEA data cable (not included)
Power source
Garmin HVS GPS antenna
Item Marine Instrument Wire Color
N/A
Black
Yellow
Blue
White
Brown
Green
Specifications
Specification
Dimensions without sun cover
(H×W×D)
Dimensions with sun cover
(H×W×D)
Weight without sun cover
Weight with sun cover
Temperature range
Compass-safe distance
Material
Brightness
Power usage
Unit max. voltage
NMEA 2000 input voltage
NMEA 2000 load equivalency
number (LEN)
NMEA 2000 PGN Information
Transmit and Receive
PGN
Description
059392 ISO acknowledgment
059904 ISO request
060928 ISO address claim
61184
Product information
126208 NMEA: Command, request, and acknowledge group function
126996 Product information
Transmit
PGN
Description
126464
Transmit PGN list group function
Receive
PGN
Description
126992
System time
127245
Rudder
127250
Vessel heading
127488
Engine parameters: Rapid update
127489
Engine parameters: Dynamic
127508
Battery status
128259
Speed: Water referenced
128267
Water depth
Antenna Wire Color
Red
Black
Orange
White
White/orange
Gray
White/red
Measurement
110 x 115 x 30 mm (4.33 x 4.53 x
1.18 in.)
115 x 120 x 35.5 mm (4.53 x 4.72 x
1.40 in.)
247 g (8.71 oz.)
283 g (9.98 oz.)
From 5° to 158°F (from -15° to 70°C)
209 mm (8.25 in.)
Case: fully-gasketed polycarbonate,
waterproof to IEC 60529 IPX7
standards
Lens: glass with an anti-glare finish
2
1200 cd/m
(NIT)
3 W max
32 Vdc
9 to 16 Vdc
7 (350 mA at 9 Vdc)
3