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
Garmin Wire
Color
NMEA 0183 Device
Wire Function
N/A
N/A
Power
N/A
N/A
Data ground
Rx/A (In +)
Brown
Tx/A (Out +)
Rx/B (In -)
Green
Tx/B (Out -)
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
Color
NMEA 0183 Device
Wire Function
N/A
N/A
Power
N/A
N/A
Power ground
Rx/B (In -)
Green
Data ground
Rx/A (In +)
Brown
Tx
This diagram is an example of a connection to a Garmin HVS
GPS antenna.
Item Description
Marine instrument with a NMEA data cable (not included)
Power source
Garmin HVS GPS antenna
Item Marine Instrument Wire Color
Antenna Wire Color
N/A
Red
Black
Black
Yellow
Orange
Blue
White
White
White/orange
Brown
Gray
Green
White/red
Specifications
Specification
Measurement
Dimensions without sun cover
(H×W×D)
110 x 115 x 30 mm (4.33 x 4.53 x
1.18 in.)
Dimensions with sun cover
(H×W×D)
115 x 120 x 35.5 mm (4.53 x 4.72 x
1.40 in.)
Weight without sun cover
247 g (8.71 oz.)
Weight with sun cover
283 g (9.98 oz.)
Temperature range
From 5° to 158°F (from -15° to 70°C)
Compass-safe distance
209 mm (8.25 in.)
Material
Case: fully-gasketed polycarbonate,
waterproof to IEC 60529 IPX7
standards
Lens: glass with an anti-glare finish
Brightness
1200 cd/m
2
(NIT)
Power usage
3 W max
Unit max. voltage
32 Vdc
NMEA 2000 input voltage
9 to 16 Vdc
NMEA 2000 load equivalency
number (LEN)
7 (350 mA at 9 Vdc)
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
GNX 20/21 Installation Instructions
3
