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Note that the GND wire is used for the current return path. This might be shared with
the NMEA- wire in some installations.
2.2 Compass to a PC serial port
In many cases the wires can be joined directly as shown in Fig 2.
.
FG1
3 Output formats available from compass
3.1
NMEA-0183
The serial output format is: 4800 Baud, 8 data bits, 1 stop bit, no parity.
The compass sends information using the standard NMEA-0183 sentence 'HDG':
M agnetic Heading, Deviation, and Variation. But note that the information of Deviation
and Variation is not sent and so blank fields are defined by consecutive commas. In the
FG1 the sentence may have one of several forms typically of the general form:
$HCHDG,hhh.h etc
Where hhh.h is the magnetic heading from 000.0 to 359.9 degrees
Also the Rate-of-turn data is sent either with or without the heading sentence.
For a complete list of output formats available see Section 5
3.2 Furuno AD-10
The compass has a separate, dedicated output in Furuno AD-10 format. This is a
proprietary 4 character serial format, which gives heading in degrees and tens of
minutes. The string 0872 represents the heading 87° 20' so that the precision is to
+
1 +8-30V
PO W ER
SOU RCE
7 GND
5 GND
3 NMEA IN -
4 NMEA IN +
6 NMEA OUT +
-
5
3
2
Fig 3
6 of 12
CO M PO R T D
CONNECTOR
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