HP PCL/PJL reference - Printer Job Language Technical Reference Manual

EN Environment Commands 6-5
Changing Environment Settings
The following scenario elaborates on how the print environment
changes during printer operation. The “number of copies” feature is
used to show feature changes as events occur.
1 The first time the printer is turned on after it leaves the factory (or
after the INITIALIZE command), the number of copies feature is
set to the factory default value of 1 copy.
2 At any point following the initial power-on or the INITIALIZE
command, the number of copies feature can be set using the
DEFAULT COPIES command in a PJL job or by changing the
COPIES = setting on the control panel. This changes the User
Default Environment setting to a new value, such as number of
copies = 3. The User Default Environment values are not loaded
into the PJL Current Environment until the next PJL reset
condition occurs. (For printers with control panels, if the printer is
currently not processing a job while the feature is changed from
the control panel, the printer treats the feature change as a PJL
reset condition and loads the newly changed value into
non-volatile RAM.)
3 If the PJL job uses the SET COPIES = 5 command to change the
number of copies, the PJL Current Environment value changes to
the selected setting (for example, 5). Otherwise, the number of
copies setting remains the same as set using the DEFAULT
command or the control panel (in this example, 3).
4 If the printer language (such as PCL or PostScript) changes the
number of copies setting to another value, such as 8, the newly
specified printer language value overrides the PJL Current
Environment value. If the printer has a control panel, however, it
still displays the User Default Environment value set using the
control panel keys or the DEFAULT command (3).
5 The next PJL reset condition defaults the number of copies
setting to the value set from the control panel or by using the
DEFAULT command (User Default Environment). In this example,
the number of copies feature setting then defaults to 3 after a PJL
reset condition.
All other features operate similarly—if any feature is not modified by a
higher priority action, it keeps its current value setting.