HP LaserJet 4100 Multifunction Printer series - Manual (Page 149)

Understanding printer commands 147
Understanding printer commands
Most software programs do not require you to enter printer commands. See your
computer and software documentation to find the method for entering printer commands,
if needed.
For additional information, refer to http://www.hp.com .
PCL 5e PCL 5e printer commands tell the printer which tasks to perform or which fonts
to use.
HP-GL/2 The printer has the ability to print vector graphics using the HP-GL/2 graphics
language. Printing in the HP-GL/2 language requires that the printer leave
PCL 5e language and enter HP-GL/2 mode, which can be done by sending
the printer PCL 5e code. Some software programs switch languages through
their drivers.
PJL HP’s Printer Job Language (PJL) provides control above PCL 5e and other
printer languages. The four major functions provided by PJL are: printer
language switching, job separation, printer configuration, and status readback
from the printer. PJL commands might be used to change printer default
settings.