Advanced Scanner Configuration Guide 57
Revision: 2.0 , technical changes excepted
Scanning Sequence A method of programming or configuring parameters for a bar code reading system
by scanning bar code menus.
Self-Checking Code A symbology that uses a checking algorithm to detect encoding errors within the
characters of a bar code symbol.
Space The lighter element of a bar code formed by the background between bars.
Specular Reflection The mirror-like reflection of light from a surface which can “blind” a scanner.
Start/Stop Character A pattern of bars and spaces that provides the scanner with start and stop reading
instructions and scanning direction. The start and stop characters are normally to
the left and right margins of a horizontal code.
Substrate A foundation material on which a substance or image is placed.
Symbol A scannable unit that encodes data within the conventions of a certain symbology,
usually including start/stop characters, quiet zones, data characters, and check
characters.
Symbol Aspect Ratio The ratio of symbol height to symbol width.
Symbol Height The distance between the outside edges of the quiet zones of the first row and the
last row.
Symbol Length Length of symbol measured from the beginning of the quiet zone (margin) adjacent
to the start character to the end of the quiet zone (margin) adjacent to a stop
character.
Symbology The structural rules and conventions for representing data within a particular bar
code type (e.g. UPC/EAN, Code 39).
Tolerance Allowable deviation from the nominal bar or space width.
TxD Transmitted data.
UPC Universal Product Code. A relatively complex numeric symbology. Each character
consists of two bars and two spaces, each of which can be any of four widths. The
standard symbology for retail food packages in the United States.
Visible Laser Diode (VLD) A solid state device which produces visible laser light. Laser light emitted from the
diode has a wavelength of 630 - 680 nanometers.
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