Astra A5022 Benutzerhandbuch - Seite 10

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NMEA-0183 inputs

The compass can be configured by sending various proprietary sentences to its NMEA-0183

input. Once configured, the compass will remember those settings every time it is

powered up.

Response:

When any of the following input sentences are received the A5022 will reply with an

'acknowledge' output sentence of the format:

$PATC,HCHDG,ACK<CR><LF>

5.1 Start Auto-Calibration

$PATC,IIHDG,IAC<CR><LF>

Refer to section 4.2. Same as pressing Switch 1 – see 4.4.

5.2 Abort Auto-Calibration.

$PATC,IIHDG,XCL<CR><LF>

Refer to section 1.3.

5.3 Resets all compass data to factory default values:

$PATC,IIHDG,0CV<CR><LF>

Output rate

output damping

heading offset

5.4 Set heading:

$PATC,IIHDG,AHD,fff.f<CR><LF>

Forces the heading to a certain value by supplying an offset which is stored and used

Where f is in degrees with a valid range of 000.0 to 359.9

When f = 000.0 the result is the same as pressing switch 2 – see 1.3.

5.5 Set the Output update period:

$PATC,IIHDG,TXP,uuuu<CR><LF>

Valid range is u=100 to 3000 milliseconds. This is limited by max. data rate of NMEA-0183

output at 4800 baud.

u= 100 milliseconds (10 updates/second),

d= 50 percent

f= 0 degrees.

thereafter.