Astra A5040 User Manual - Page 8

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Output formats available from compass

3.1

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 A5040 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 1/6 of a degree. At the

same time the A5040 would be also sending the NMEA data to a precision of 1/10 of a

degree.

Clock

Data

Duration of data is 16 clocks each

480µs

high=low=30µs. Total = 480µs.

100ms minimum

Fig 4

Frequency of data packets is set by

the interval command. Max = 10Hz