HP PCL/PJL reference (PCL 5 Printer Language) - Technical Reference Manual Part I

EN Job Separation Command 4-11
Job Separation Command
Job separation provides a means of identifying one print job from
others in the printer’s output tray. It usually does this by physically
offsetting one print job from the next.
The Job Separation command toggles the printer’s separation
mechanism. This command must be sent between each job to enable
the separation mechanism.
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HP recommends that the Job Separation command be included at the
end of each job, just before the Printer Reset command. HP also
recommends that this command be included in the programs even
though printers with job separation are not currently being used. This
ensures that if a printer with job separation is eventually added, job
separation will be performed.
If this command is received by a printer which does not have job
separation, the command is ignored.
Note It is possible to perform job offset in printers which do not have a
mechanical offset mechanism but have dual paper trays. In dual bin
printers, job offset can be performed by placing colored paper in the
second tray and using Paper Source command to select the tray to
feed a blank sheet of colored paper at the end of a job. This method
should only be used in special cases where the end user can control
its use, for example, the program should only be available for a dual
bin printer which can always contain colored paper in one tray.