Spectra Precision ProMark 800 Reference Manual - Manual (Page 315)

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Query Command Library
Automatic Output
of GLL Messages
This is a reminder on how to output GLL messages at regular
intervals of time: Use the $PASHS,NME command with the
syntax below:
$PASHS,NME,GLL,<port_ID>,ON,<Rate>
For more details on the $PASHS,NME command, refer to the
Set Command Library Chapter.
As an example, the command below will output GLL
messages on port A at a rate of 0.5 second:
$PASHS,NME,GLL,A,ON,0.5