HP 2550n HP PCL/PJL reference - Printer Job Language Technical Reference Manua - Page 271
Backward-Compatibility Mode, 4P, 4MP, 4PJ, 4LJ Pro, 4LC, 4000 series - color laserjet not printing color pages
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Note Backward-Compatibility Mode Printers that support the backward-compatibility mode: HP LaserJet 4, 4M, 4 Plus, 4M Plus, 4V, 4MV, 4Si, 4SiMx, 4L, 4ML, 4P, 4MP, 4PJ, 4LJ Pro, 4LC, 4000 series, 5, 5M, 5L, 5P, 5MP, 6L, 6P, 6MP, 5Si, 5SiMx, 5Si Mopier, HP Color LaserJet, HP Color LaserJet 5, 5M, 1100 series, 2100 series, 4500 series, 5000 series, 8000 series, 8100 series, 8500 series If the printer detects PCL data immediately after a job boundary, it enters a backward-compatibility mode that responds like an HP LaserJet III printer. This lasts until the next job boundary is detected. For backward- compatibility mode to occur, the PERSONALITY variable must be set to AUTO or PCL, and the job must contain only PCL data-if any PJL commands are received during the job, the printer does not enter backward-compatibility mode. There are two differences between backward-compatibility mode and normal operating mode. In backward-compatibility mode, when a PCL printer language reset (E) is executed, instead of causing the PJL Current Environment variables to be loaded into the Modified Print Environment, the User Default Environment settings (control panel values) are loaded. This is the same way the LaserJet III printer works. Because HP LaserJet 4L, 5L, 6L, and 1100 series printers do not support job boundaries (JOB/EOJ), they always load the PJL Current Environment variables into the Modified Print Environment after receiving an E reset. Also, when a backward-compatible job ends with a partial page (one not terminated with a form feed or PCL printer language reset) and the job times out, the job does not immediately end, printing the partial page. Instead, the printer waits to see if the next job sent consists of more PCL data (from the same I/O port), which it then appends to the partial page already in the printer. (This works the same way as the HP LaserJet III printer, which does not have a job timeout.) If PJL data is received instead, the partial page is printed before the new PJL job is executed. EN Product-Specific Feature Support A-49