HP LaserJet Emulation (Mode 6)
7-41
Resource protection becomes operational under any of the following emulation switch-
ing conditions:
• An SEM command is sent to the printing system.
• The emulation is changed by the user from the operator panel keys.
• An automatic emulation sensing (AES) function is used for switching between KPDL
and PCL.
• An HP LaserJet PJL command @PJL ENTER LANGUAGE = ?? is received.
The KPDL permanent dictionary is always protected, regardless of the values for N9.
The amount of memory saved under resource protection is limited by the user memory
available. Resource protection requires extra memory for storing downloaded fonts and
macros. This memory requirement extends beyond the standard memory that accompa-
nies the printing system. The requirement varies based upon optional features installed in
the printing system.
Note that a print environment using resource protection but whose space has been lim-
ited by user memory items like macros, symbol sets and fonts, will render the resource
protection feature non-operational.
The property value (temporary or permanent) assigned to a resource must be given in the
PCL command language. PRESCRIBE provides no commands for making a temporary
or permanent designation. As a result, resource protection mode applies only to those
resources generated with the HP PCL command language. A description of the memory
requirements and property values for typical models appear in the following table.
Minimum memory requirement for Resource Protection
The following tables are memory requirements for typical printing system models. For
information on memory requirement on other printing system models, refer to the opera-
tion manual supplied with the printing system.
N9 = 1, permanent PCL resources
are protected.
The printing system will store in memory all
resources marked as permanent (soft fonts, macros,
user patterns and symbol sets) and protect these
resources during emulation switching. All resources
marked as temporary (soft fonts, macros, user pat-
terns, and symbol sets) will be lost during emulation
switching. The print environment will be reset when
it is returned to the mode 6 emulation.
N9 = 2, permanent and temporary
PCL resources are protected.
The printing system will store in memory all
resources, both temporary and permanent, and pro-
tect them during emulation switching. Instead of
resetting the mode 6 environment upon switching
back, the printing system will restore the previous
print environment. This option demands a large
share of printing system memory.
Table 7.20. Example: FS-1000 Series
Printing Condition Resolution
300 dpi 600 dpi
HPLJ 4 2 Mbytes 2 Mbytes
HPLJ 4, duplex mode=None, raster memory=A4/Letter 2 Mbytes 6 Mbytes
HPLJ 4, duplex mode=None, raster memory=Legal 2 Mbytes 7 Mbytes
HPLJ 4, duplex mode=on, raster memory=A4/Letter 3 Mbytes 10 Mbytes
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