Simrad HS80/MX575C, User Manual

Page: 46 / 55

| 45
Technical specifications | HS80/MX575C User Manual
Sentence type: $GPMSK
Description: Beacon tune command
There are three main derivatives of this command that affects the method of beacon receiver
tuning, and each are described in the following sections.
Full manual command ($GPMSK):
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,,,*
$GPMSK,305,,A,,A,,,*
Partial manual tune command ($GPMSK):
This command instructs the internal beacon receiver to tune to a specified frequency and
automatically select the correct MSK rate.
It has the following form:
$GPMSK,fff.f,M,,A,n<CR><LF
The internal SBX will reply with the following response:
$PCSI,ACK,GPMSK,fff.f,M,,A,n<CR><LF>
When this message is acknowledged by the internal beacon receiver, it will immediately tune
to the frequency specified and demodulate at the rate specified.
Field Description
fff.f Frequency in kHz (283.5 to 325)
M Designates manual frequency selection
ddd MSK bit rate (100 or 200 bps)
A Designates Automatic MSK bit rate selection
n
Period of output of performance status message, 0 to 100 seconds
($CRMSS)