Motorola Symbol LS4278 Product Reference Manual page 402

Glossary - 6 Symbol LS4278 Product Reference Guide
S
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 direct reflection of
light from a surface, which can cause difficulty
decoding a bar code.
T
Tolerance. Allowable deviation from the nominal bar or
space width.
U
UPC. Universal Product Code. A relatively complex
numeric symbology. Each character consists of two
bars and two spaces, each of which is any of four
widths. The standard symbology for retail food
packages in the United States.
SPP. Serial Port Profile.
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, PDF417, etc.).