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An optional 8-foot, CA-4 external power cable with a cigarette lighter
adapter is available from Lowrance.
NMEA 0183/DGPS Cable Connections
NMEA is a standard communications format for marine electronic
equipment. For example, an autopilot can connect to the NMEA inter-
face on the LMS-480 and receive positioning information. The LMS-480
can exchange information with any device that transmits or receives
NMEA 0183 data.
DGPS is an acronym for the Differential Global Positioning System.
DGPS supplements and boosts the accuracy of basic GPS. DGPS was
developed by the U.S. Coast Guard, which is responsible for the sys-
tem's operation in the United States. Since it's creation, DGPS has be-
come the international maritime standard for marine navigation.
The most popular DGPS system relies on a grid of ground-based trans-
mitters that send correction signals to DGPS receivers. These in turn,
connect to the GPS receiver (such as the LMS-480). Lowrance offers an
optional DGPS receiver for your unit.
See the following diagram for general wiring connections. Read your
other product’s owner’s manual for more wiring information.
NMEA/DGPS Wiring
(Data cable)
To exchange NMEA 0183 or DGPS data, the LMS-480 has one NMEA
0183 version 2.0 communication port. Com port one (Com-1) can be
used to receive NMEA format GPS data or DGPS data. The com port
can also transmit NMEA format GPS data to another device.
The four wires for the com port are combined with the Power Supply
cable and NMEA-2000 Power cable to form the power/data cable
(shown earlier). Com-1 uses the yellow wire to transmit, the orange
wire to receive and the shield wire for signal ground. Your unit does not
use the blue wire.
Com-1 wiring to receive DGPS position information
from a DGPS receiver.
Orange (Receive)
Shield (Ground)
Transmit
Ground
Com-1
To LMS-480
To DGPS
Receiver
Yellow (Transmit)
NMEA Receive