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4-2 PCL Job Control Commands EN
This chapter describes the commands providing job control. Job
control commands are usually grouped together and sent at the
beginning of a job. Page control commands and data are associated
with each printed page of a job. Job control commands include the
following:
z Printer Reset.
z Universal End of Language/Start of PJL.
z Number of Copies.
z Simplex/Duplex Print.
z Left and Top Offset Registration.
z Duplex Page Side Selection.
z Job Separation.
z Output Bin Selection.
z Unit of Measure.
Printer Reset Command
Receipt of the Printer Reset command restores the User Default
Environment, deletes temporary fonts, macros, user-defined symbol
sets and patterns. It also prints any partial pages of data which may
have been received.
? E
Notes Hewlett-Packard strongly recommends the use of both the ? E
command and the ?%–12345X command (Universal Exit
Language/Start of PJL — also referred to as the UEL Command) at
the beginning and end of each job. (The order of these commands is
critical. Refer to Table 4-1 for an example.)
The UEL Command (?%–12345X) has the same effect as the ? E
command, and also enters PJL Mode of operation for printers that
support PJL (refer to the next section, "“Universal Exit Language
Command” for more information). The ? E command should be
included to ensure backward compatibility (the UEL command is
ignored if received by a printer that does not support PJL).