MX575A/B DGPS Compass
56
Sentence Type: $GPMSK
Description:
Beacon tune command
There are three main derivatives of this command that affects the method of beacon
receiver tuning, and each are described in the following sections.
Full Manual command ($GPMASK)
:
This command instructs the MX575’s internal beacon receiver to tune to a specified
frequency and MSK Rate.
It has the following form:
$GPMSK,fff.f,M,ddd,M,n<CR><LF>
The internal SBX will reply with the following response:
$PCSI,ACK,GPMSK,fff.f,M,ddd,M,n<CR><LF>
When this message is acknowledged by the internal beacon receiver, it will
immediately tune to the frequency specified and demodulate at the rate specified.
Field
Description
fff.f
Frequency in kHz (283.5 to 325)
M
Designates manual frequency selection
ddd
MSK bit rate (100 or 200 bps)
M
Designates manual MSK bit rate selection
n
Period of output of performance status message, 0 to 100 seconds
($CRMSS)
Example:
$GPMSK,305,M,,A,,,*
$GPMSK,305,,A,,A,,,*
