Compuprint 4247-Z03 Programmer Manual Manuel d'utilisateur télécharger pdf (Page 107)

Control, or Write Bar Code (block) Control commands in the data stream indicates that the printed page

contains individual blocks of image, graphics, or bar code data for positioning on the page. These

commands cause a state transition to occur to an appropriate page block state. In the block state, the

printer establishes the initial conditions and processes the block of data onto the page. Receiving an End

command in a page block state terminates that state and returns processing back to the page state.

Figure 8 shows the relationship between the home state, page state, and block states.

Overlay State

Overlay state is the operating state that stores data in the printer. The printer enters the overlay state from

the home state as a result of receiving a Begin Overlay command.

A parameter in the Begin Overlay command provides an identifier for later references to this overlay. The

printer saves the currently active Logical Page Descriptor value, the Load Font Equivalence value, and the

Load Equivalence value as part of the stored overlay definition.

The same commands that the printer uses in the page state are also valid while in the overlay state.

Figure 9 on page 88 shows the relationship between the home state, overlay state, and block states.

Figure 8. The Relationship between Home State, Page State, and Block States

Chapter 3. Intelligent Printer Data Stream 87

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Compuprint 4247-Z03 Programmer Manual Manuel d'utilisateur Page 107