Tally Genicom 6600 manual Pass Spacing Modplot, Pass Buffer Length, Graphics Pass

Chapter 1 Graphics Pass

Not all GPL commands and data sent to the printer need to be in a pass. In fact, many commands must be outside of a pass to function properly. For instance, the command ^H sets the form length if it is used outside of a pass, but sets the pass height if it is used within a Pass.

At this point, it may seem difficult to decide when to use a Graphics Pass. If there is any doubt about whether a command should go inside or outside of a pass, refer to Appdendix F, “Command Table” on page 287. The GPL commands fall into two general categories:

Inside A Pass

•GPL positioning commands (e.g., tabs, vertical justification, etc.)

•GPL printing commands (e.g., barcodes, lines, boxes, certain fonts, etc.)

•Block characters

Outside A Pass

Global Graphics Pass commands (i.e. commands which act on the entire pass as a unit, such as those which cause the entire Pass to be repeated or stored in memory for later use).

Environmental commands wuch as form length setting, Graphics Mode, and Free Format.

Non-GPL Data

Any data you want to go to the current Control Panel emulation must be sent outside of a Graphics Pass. Appdendix F, “Command Table” on page 287 lists all GPL commands.

Pass Spacing (Modplot)

Code V output can be affected by a Plot Mode option that is available on your printer. Appendix G, “Modplot” on page 291 explains the Modplot option and how it affects Code V output.

Pass Buffer Length

Data received from the host is stored in a Pass Buffer. The Printer begins to process a Graphics Pass when it receives a Pass Terminator. The printer processes one pass at a time, printing at the end of each pass. If the Pass Buffer fills up before the printer encounters a Pass Terminator, it terminates the pass and attempts to process and print it.

Buffered Form definitions and Repeat sequences cannot be processed until the Form or Repeat Terminator is received; therefore, the entire Form Definition or Repeat Sequence must fit into the Pass Buffer to be printed correctly. Buffered Form execute data can be larger than the Pass Buffer. The Printer processes this data one Pass Buffer at a time, until the Form Execute Terminator is received.

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