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Author Topic:   NMEA Interfacing
jimh posted 09-17-2006 09:31 AM ET (US)   Profile for jimh   Send Email to jimh  
Several people have inquired about the interfacing between NMEA devices. Below is the interface between my GPS (Standard Horizon CP150), my radio (ICOM M302) , and my fuel instrument (NAVMAN 3100 FUEL). This information may be useful to others with similar equipment:

First, the following information is directly from the various owner's manuals supplied with the equipment:

CP150 External Wiring
CONNECTOR

PIN    WIRE COLOR    DESCRIPTION      CONNECTION EXAMPLE
1 BLACK Battery Ground Negative 12Vdc Source
2 RED Positive 12Vdc Positive 12Vdc Source
3 GREEN NMEA Ground Common NMEA (-) Connection on VHF's,
Instruments, Autopilots
4 BLUE NMEA 1 Input(+) NMEA (+) output of VHF radio for DSC
Distress and Position Requests
5 BROWN NMEA 1 Output(+) NMEA Input of VHF radio (Lat/Lon, date,
time) or other listener
6 GRAY NMEA 2 Input(+) NMEA (+) output of digital instruments,
RTCM output of differential beacon
receiver
7 WHITE NMEA 2 Output(+) NMEA (+) input of NMEA listeners
8 YELLOW NMEA 3 Output(+) NMEA (+) input of Autopilot


ICOM M302 CONNECTIONS

GPS Receiver Lead
Connects to a GPS receiver for position indication.
An NMEA 0183 ver. 2.0 or 3.0 (sentence formatters
RMC, GGA, GNS, GLL) compatible GPS receiver is required.

YELLOW: NMEA IN (+)
GREEN: NMEA IN (-)


NAVMAN 3100 Fuel Instrument
Power/data cable wiring

YELLOW = NMEA in
WHITE = NMEA out
ORANGE = NavBus
BLUE = NavBus
RED = Power (shown via engine ignition switch and fused)
GREEN = Alarm beeper or light (pulldown to ground; 250mA max.)
BLACK = NMEA ground (shown to battery negative)

The FUEL 3100 can read speed data (RMC) from a compatible
NMEA GPS instrument.

--

Next, a brief description of the very simple interconnection of the three devices:

SYSTEM INTERCONNECTIONS: WIRING

GPS --> RADIO

BROWN (NMEA 1 Output +) --> YELLOW (NMEA IN +)
The radio GREEN lead, which is NMEA IN (-)
is connected to battery negative at the same
terminal which is feeding power to the GPS.

GPS --> NAVMAN

WHITE (NMEA 2 Output +) --> YELLOW (NMEA IN)

The instrument BLACK lead, which is NMEA (and power) ground,
is connected to battery negative at the same
terminal which is feeding power to the GPS.

The GPS GREEN lead (NMEA Ground) is connected to the battery
negative at the same terminal which is feeding power to the
GPS.

SYSTEM SOFTWARE CONFIGURATION:

GPS
The GPS must be configured to send the appropriate data on the
NMEA outputs. The ICOM radio prefers the NMEA sentence RMC. The
NAVMAN 3100 FUEL also prefers the NMEA sentence RMC. Consult the
manual with the GPS to select this data to be sent on the NMEA outputs.
In the case of the CP150, this is configured with the keystroke sequence

MENU + ADVANCED SETUP + ENTER + INPUT/OUTPUT + ENTER + NMEA1 OUTPUT + ENTER

and

MENU + ADVANCED SETUP + ENTER + INPUT/OUTPUT + ENTER + NMEA2 OUTPUT + ENTER

RADIO
The radio may require configuration to listen for NMEA data. Consult
the manual for more information. In the case of the ICOM 302
there is no configuration. The radio displays GPS
lat/lon data if it is receiving it from the GPS. To see the data:

Push DSC•POS for one second to display the current position

NAVMAN
The FUEL 3100 must be set to use the GPS as the speed input.
This is configured in the SET UP menu, under the SPEED sub-menu.
Select GPS as the desired source.

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