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4: NMEA 0183 Interface
NMEA 0183 Commands
This section discusses the standard and proprietary NMEA 0183
commands accepted by the MBX-4 receiver.
Standard Commands
The following subsections describe the selection of valid standard
NMEA-0183 commands, and their responses.
Full Manual Tune Command ($GPMSK) - This command instructs
the MBX-4 to tune to a specified frequency and MSK Rate. It has the
following form:
$GPMSK,fff.f,M,ddd,M,n<CR><LF>
MBX-4 Response:
$PCSI,ACK,GPMSK, fff.f,M,ddd,M,n<CR><LF>
In this message, fff.f is the frequency in kHz, and M designates manual
frequency selection. The ddd field represents the desired MSK bit rate
in bits per second (100, 200 bps, or non-standard), and the second M
designates manual MSK rate. The n parameter is the period of the
performance status message output by the receiver (0 to 100 seconds).
When power is cycled, the status output interval resets to zero.
The status message output by the MBX-4, as initiated using this
command, is the CRMSS message response discussed in Chapter 4.
Note - If the “n” field in this message is non-zero, the status
data message output by the MBX-4 may interrupt the flow of
RTCM messages to the GPS receiver.
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