7265 Programmer’s Manual 34Copyright © 2004 TallyGenicom Chapter 3 ANSI Bar CodesBefore You Begin - Set the Form LengthProgrammers tend not to trust form feeds and sometimes use line feeds instead to move fromone form to another. If there is any advantage to that approach, it is that the vertical move will notdepend on the current form length. When printing bar codes on labels, you can greatly simplifyyour task by setting a form length that exactly matches the length of your physical form and thenusing form feeds to make vertical moves between labels or rows of labels.If you print nothing but text, then the vertical position following each line feed lies on a grid that isevenly spaced according to the line feed increment. If you print a bar code symbol, then positionsestablished by subsequent line feeds may not be on that grid. The vertical position following a barcode symbol becomes the origin for a subsequent line feed; this new origin must be computedbased on bar code height, and the status of the human-readable line.If you do not initialize your vertical position with a form feed for each row of labels, then printedobjects may creep cumulatively up or down with respect to the top of your physical form.
