A5023/24
9 of 19
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’: Magnetic 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 A5024/4 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 5.11
3.2 Furuno AD-10 - A5024 only
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 1/6 of a de
gree. At the same time the
A5024 would be also sending the NMEA data to a precision of 1/10 of a
degree.
480µs
100ms minimum
Duration of data is 16 clocks each
high=low=30
µs. Total = 480µs.
Frequency of data packets is set by
the interval command. Max = 10Hz
Clock
Data
Fig 4
