HP Color LaserJet 5500 Technical Reference Manual page 145

JOB Variable
The USTATUS JOB = ON command is used to notify the
application every time a JOB command is encountered,
when the final page of a job is in the output tray and an
EOJ command has been received, and when a job has been
canceled (HP LaserJet 4000 series, 5, 5M, 5Si/5SiMx/
5Si Mopier only). This is useful for spooling applications
requiring feedback indicating that a particular job has
started or completely printed.
If job status is enabled and the printer receives a JOB
command, it resets the page count associated with the
unsolicited page status and returns a job status message.
Note
Resetting the page count associated with unsolicited page
status affects only future pages. Pages that are already
processed, but not yet printed, are not affected.
The PAGES=number of pages information associated with
unsolicited EOJ status indicates the number of pages
printed on paper. It does not include any page images that
were processed in non-printing mode (see the "PAGE
Variable" discussion.) When in the duplex mode, each side
of a duplex page counts as one page.
Status Readback Commands 7-37