HP 5100tn Printer Job Language - Technical Reference Manual - Page 13
What is PJL?
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1 Introduction to PJL What is PJL? Hewlett-Packard's Printer Job Language (PJL) was developed to give software applications more job-level printer control, and to provide printer status information to applications. PJL provides for the special needs of networks and other multi-user systems, in addition to enabling applications to simulate control panel functions that previously could not be controlled without pressing control panel keys. For the HP printers (HP LaserJet, HP DeskJet, and HP DesignJet) that support it, PJL allows job-level control that cannot be accomplished with PCL, PostScript, or other printer languages. To provide this control, PJL functions "above" the level of PCL and other printer languages, providing four major functions: Printer language switching between jobs Job separation Printer configuration Status readback from the printer to the host computer Introduction to PJL 1-1