HP LaserJet 9000 Printer series - Manual (Page 228)

D Printer commands 228
Overview
PCL 5e
PCL 5e printer commands tell the product which tasks to perform or which fonts to use. This appendix provides a quick
reference for users familiar with PCL 5e command structure.
Note Unless PCL 5e backward compatibility is required, HP recommends that PCL 6 drivers be used to take full advantage
of all product features. The PCL 5e driver in this product is not backward compatible with older products that use PCL
5e drivers.
HP-GL/2
The product has the ability to print vector graphics using the HP-GL/2 graphics language. Printing in the HP-GL/2 language
requires that the product leave PCL 5e language and enter HP-GL/2 mode, which can be done by sending the product PCL 5e
code. Some software applications change languages through their drivers.
PJL
HP Printer Job Language (PJL) provides control above PCL 5e and other printer languages. The four major functions
provided by PJL are: product language changing, job separation, product configuration, and status readback from the printer.
PJL commands may be used to change product default settings.