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4: NMEA 0183 Interface
NMEA 0183 Queries
This section discusses the standard and proprietary NMEA 0183 queries
accepted by the MBX-4 receiver.
Standard Queries
The following subsections describe the selection of valid standard
NMEA-0183 queries, and their responses.
Receiver Operating Status Query ($GPCRQ) - This standard NMEA
query prompts the MBX-4 receivers for their operational status. It has
the following format:
$GPCRQ,MSK<CR><LF>
MBX-4 Response:
$CRMSK,fff.f,X,ddd,Y,n*CS
When queried for their operational status, both receivers will return this
NMEA response where fff.f is the current frequency in kHz, X is the tune
mode (A = automatic and M = manual), ddd is the MSK bit rate, Y is the
MSK mode (A = automatic and M = manual), and n is the output period
of the CRMSS performance status message. The *CS field is the
checksum that terminates the NMEA response.
Receiver Performance Status Query ($GPCRQ) - This standard
NMEA query prompts the MBX-4 receiver for their performance status:
$GPCRQ,MSS<CR><LF>
MBX-4 Response:
$CRMSS,xx,yy,fff.f,ddd*CS
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