ashtech GG Surveyor, Reference Manual

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82 GG Surveyor GPS+GLONASS Reference Manual
Table 6.9 outlines the structure:
User settings are saved in battery-backed-up memory through power cycles, and are
used until a new frequency is selected, until turned off ($PASHS,EXF,OFF) or the
memory is cleared.
Example: Enable the external frequency at 20 mHz.
$PASHS,EXF,ON<Enter>
$PASHQ,EXF,c
The associated query command is $PASHQ,EXF, where c is the optional output serial
port.
Example: Query the external frequency status to port A.
$PASHQ,EXF,A<Enter>
$PASHR,EXF
The response message is in the form $PASHR,EXF,s where s is:
FIL: Close or Delete File
$PASHS,FIL,x,y
Closes the current file or deletes a designated file, where x is C for close or D for
delete, and y is the file index number. The receiver can store up to 100 files. The first
file is numbered 0, not 1.
Table 6.9: EXF Structure
Field Description
ON Turn on external reference frequency (if s=ON, the external reference
frequency must be 20 MHz. If the frequency is not 20 MHz, use
s=XXX)
OFF Revert to internal oscillator (default)
XXX Set external frequency to a value between 10,000 and 21,000,000 Hz
in steps of 10,000 Hz
Table 6.10: EXF Response Structure
Field Description
OFF Internal oscillator is used
s External frequency is used, at frequency s