HP 5961-0509 Establishing Default Conditions, DF command is not as powerful as the in command

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