INITIALIZE commands. The password can only be changed
from within a secure PJL job.
On printers with a control panel, the control panel can be
“locked out” so that users cannot modify settings using the
control panel keys. This is accomplished using the
DEFAULT command to set the CPLOCK variable to ON.
The LaserJet 4V/4MV and 5Si/5SiMx printer’s disk can be
“locked” so that it cannot be formatted, fonts cannot be
written to it, and disk fonts cannot be erased. For more
information on CPLOCK, DISKLOCK and other security
issues, see “PJL Job Security” in Chapter 5.
LaserJet Printers
With Reduced-
Function
Control Panels
HP LaserJet 4L, 4LJ Pro, 4ML, 4LC, 5P, 6P, 6MP, 5L, and
6L printers have no control panel to specify printer settings.
These printers have several features that are different than
those of other PJL printers. This section describes those
differences and how they affect the use of PJL.
No device attendance commands are supported—these
printers rely on unsolicited status to communicate with
the user.
No NVRAM (HP LaserJet 4L/5L/6L only)—because these
printers are designed to conserve energy and do not have
a power switch, they are never turned off. Therefore,
they do not need NVRAM to store feature settings. To
simulate a power cycle, use the RESET command to
initialize all PJL variables except PAPERSIZE.
No multiple I/Os or job boundaries supported (LaserJet
4L/5L/6L only)—these printers are designed for
single-user environments. They do not support I/O
switching or the concept of job boundaries. Therefore, the
JOB and EOJ commands are not supported.
No multiple language support (LaserJet 4L/5L/6L
only)—there is no support for multiple printer languages.
PCL 5 is the sole printer language. Even though there is
Feature Support A-35
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