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

11-6 Programming Tips for Using PJL EN
Commands Used by Printer Utilities
Printer utilities that are equipped for bi-directional communications
can request printer status using the following commands:
UEL Use before and after every PJL job.
COMMENT Use to add explanations within PJL code.
SET To modify a printer feature until the next PJL reset
condition.
RESET To set the printer to its user default feature settings.
DEFAULT To modify the user default value of a printer
feature. (NOTE: In shared environments, this
feature should be used by system administrators
only.)
INITIALIZE To set the printer to its factory default settings.
(NOTE: In shared environments, this feature
should be used by system administrators only.)
INQUIRE To request the current setting for a particular
feature.
DINQUIRE To request the default setting for a particular
feature.
INFO To find the printer model, printer configuration,
memory available, status
information, page count, or printer variables.
ECHO To synchronize requested status information.
USTATUS
DEVICE
To be informed when the printer status changes.
USTATUS
TIMED
To receive unsolicited printer status at periodic
intervals.