HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 49
Establishing Default Conditions
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Establishing Default Conditions Whether you are using HP-GL/2 mode or strictly the PCL printer language mode, you should establish default conditions at the beginning of each print job to prevent unexpected results due to "leftover" command parameters from a previous job. From within HP-GL/2 mode there are two ways to establish default conditions: using the Initialize (IN) command or using the Default (DF) command. Using the IN command sets the printer to its user-selected defaults. This process is called initialization. The reset command (ECE) executes an Initialize (IN) command automatically, so if a reset was sent at the beginning of your print job, HP-GL/2 command parameters are at their user-selected default state when HP-GL/2 mode is first entered. (See Chapter 3 for a more thorough discussion of the printer environment and how it is affected by the reset command.) Note HP-GL/2 command parameters are set to their default values the first time HP-GL/2 mode is entered during a print job (assuming that an ECE reset is sent at the beginning of the job). After commands have been sent to modify the current print environment, the command parameters are no longer set to their defaults. When re-entering HP-GL/2 mode, immediately sending an IN command ensures that HP-GL/2 features are set to their default conditions (if that is desired). The DF command is not as powerful as the IN command. The conditions set by the DF and IN commands are described later in this chapter. EN Establishing Default Conditions 19-3