Spectra Precision ProMark 800 Reference Manual - Manual (Page 345)

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Query Command Library
$APSHR,OPTION,#,REGISTRATION CODE,057743D104182*07
$PASHR,OPTION,K,RTK,6756975c71766*36
$PASHR,OPTION,S,GLONASS,6756945714671*7B
If the registration code is incorrect, the command returns the
following:
$PASHQ,OPTION
$PASHR,OPTION,0,SERIAL,NUMBER,200751223*7A
$APSHR,OPTION,#,REGISTRATION CODE,-------------*07
Relevant Set
Command
$PASHS,OPTION
PAR: Receiver Parameters
Function This command lists the currently used parameters for the
specified type of receiver settings. The response is returned
on the port routing the query command.
Command Format Syntax
$PASHQ,PAR[,s1][*cc]