HP 5100tn Printer Job Language - Technical Reference Manual - Page 249

Under these conditions, the printer samples the incoming printable data and looks for indications of a particular printer language. Once it recognizes the printer language, the printer backs up to the beginning of the sampled print data and switches to the printer language determined to be most appropriate. Then the printer begins to parse the data in the newly selected printer language. Although the printer can accurately select printer languages this way, we recommend that every job containing printable data include an ENTER LANGUAGE command to explicitly switch to the correct printer language. This method improves performance and eliminates errors in printer language switching. It also guarantees that the correct language is always selected. Note The value of the PARALLEL feature as shipped from the factory is FAST. When a front panel reset is performed, the value is defaulted to SLOW. Printer Environment Printers that support printer environment variables: HP DeskJet 1600C, 1600M Unlike most PJL variables, the following environment variable defaults are not stored in the printer's NVRAM. The primary use is to set job-specific parameters like those available through the DeskJet 1200C family front panel. This means that they will be reset to the factory default values after a power cycle. Feature Support A-37