Job Cancellation Unsolicited Status - HP Color LaserJet 5500 Technical Reference Manual

If the job had been cancelled instead of completed, the
printer would respond with the same message except the
RESULT value would be different.
Job Cancellation
As soon as the printer receives notification that a job is
cancelled, the printer provides the @PJL USTATUS JOB
Unsolicited Status
CANCELED message to the driver/spooler if unsolicited job
status is enabled. Using the same job name and ID number
as the previous example, the printer's response would be:
@PJL USTATUS JOB<CR><LF>
CANCELED<CR><LF>
NAME=" job name "<CR><LF>
ID=346<CR><LF>
RESULT=USER_CANCELED
<FF>
The job name provided in the NAME option of the PJL
USTATUS JOB CANCELED response is the current job
name if a current job name is available. The current job
name is the job name retained in the printer at the time the
last PJL JOB command was processed. The current job
name could also have been supplied and/or modified using
PostScript.
If a job name is supplied in the EOJ command and if
unsolicited job status is enabled at the time the EOJ
command is parsed, the NAME option of the PJL
USTATUS JOB CANCELED response will contain the job
name assigned in the EOJ command. Otherwise, the
NAME line is eliminated from the response.
5-16 Job Separation Commands