MBX-4 User Guide
65
Partial Manual Tune Command ($GPMSK) - This command
instructs the MBX-4 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
MBX-4 Response:
$PCSI,ACK,GPMSK, fff.f,M,,A,n<CR><LF>
In this message, fff.f is the frequency in kHz, and M designates manual
frequency selection. The A field designates automatic MSK rate. Then
parameter is the period of the performance status message, as output
by the MBX-4 (0 to 100 seconds). When power is cycled, the status
output interval resets to zero.
Again, the status output is the CRMSS message response, discussed in
Chapter 4.
Automatic Beacon Search Command ($GPMSK) - This command
initiates the MBX-4 automatic mode of operation in which the receiver
operates without operator intervention, selecting the most appropriate
beacon station. This command has the following format:
$GPMSK,,A,,A,n<CR><LF>
MBX-4 Response:
$PCSI,ACK,GPMSK,,A,,A,0<CR><LF>
In this message, the first A designates automatic frequency selection,
and the second A designates automatic MSK rate. The n parameter is
the output period of the performance status message from the receiver
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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