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5
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 FG1 will reply with an
' acknowledge' output sentence of the format:
$PATC,HCHDG,ACK<CR><LF>
5.1Start Auto-Calibration
$PATC,IIHDG,IAC<CR><LF>
R efer to section 4.2. Same as pressing Switch 1 – see 4.4.
5.2Abort 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>
O utput 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.
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