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Zebra S-Series User’s Guide 91
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Alphanumeric — Indicating letters, numerals, and characters such as
punctuation marks.
Backfeed — The printer pulls the media and ribbon (if used) backward
into the printer so that the beginning of the label to be printed is properly
positioned behind the printhead. Backfeed occurs when you’re operating
the printer in tear-off or peel-off mode.
Bar code — A code by which alphanumeric characters can be represented
by a series of adjacent stripes of different widths. Many different code
schemes exist, such as the universal product code (UPC) or Code 39.
Black mark sensing — See “Reflective media sensor” on page 93.
Calibration (of a printer) — A process in which the printer determines
some basic information needed to print accurately with a particular media/
ribbon combination. To do this, the printer feeds some media and ribbon
(if used) through the printer and senses whether to use the direct thermal or
thermal transfer print method; whether continuous or non-continuous
media is used; and, if non-continuous media, the length of individual
labels/tags.
Character set — The set of all letters, numerals, punctuation marks, and
other characters that can be expressed by a particular barcode.
Check digit — A character added to a barcode symbol that indicates to the
scanner that it has read the symbol correctly.
Continuous media — Label or tagstock that has no web (space between
labels), notch, or gap to separate each label/tag; rather, the media is one
long piece of material.
Core diameter — The inside diameter of the cardboard core at the center
of a roll of media/ribbon.