Symbol SE 2223, Integration Manual

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Glossary-6
SE 2223/3223 Scan Engine Integration Guide
RxD Received data.
Scan Area Area intended to contain a symbol.
Scanner An electronic device used to scan bar code symbols and produce a digitized
pattern that corresponds to the bars and spaces of the symbol. Its three
main components are:
1. Light source (laser or photoelectric cell) - illuminates a bar
code.
2. Photodetector - registers the difference in reflected light
(more light reflected from spaces).
3. Signal conditioning circuit - transforms optical detector
output into a digitized bar pattern.
Scanning Mode The scanner is energized, programmed, and ready to read a bar code.
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).