HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 335
Job Control, Printer Reset
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Job Control Printer Reset Hewlett-Packard strongly recommends the use of both command and the EC%-12345X command (Universal the ECE Exit Language/Start of PJL - also referred to as the UEL Command) at the beginning and end of each job. (The order of these commands is critical; refer to Table 24-1 for an example.) This allows the next job to start with the default settings as a known base. Starting with the default environment at the beginning of each print job eliminates the need to set every feature each time a job is run. Table 24-1 Structure of a Typical Job EC%-12345X ECE Preamble UEL Command (exit language). Printer Reset Command. Job Control Commands. Page 1 Page Control Commands. Data M Page n M Page Control1 Commands. Data. ECE EC%-12345X Printer Reset Command. UEL Command (exit language). 1. If a number of consecutive pages within a job have the same format (such as margins, VMI, HMI, etc.), the associated page control commands only need to be sent once for that group of pages. Note EN The UEL Command (EC%-12345X) has the same effect as the ECE command, and also enters PJL Mode of operation for printers that support PJL. The ECE command should be included to ensure backward compatibility (the UEL command is ignored if received by a printer that does not support PJL). Do not perform a printer reset within a job. Job Control 24-3