Glossary - 6 DS6878 Product Reference Guide
Programming Mode. The state in which a scanner is configured for parameter values. See Scanning Mode.
Q
Quiet Zone. A clear space, containing no dark marks, which precedes the start character of a bar code symbol and
follows the stop character.
QWERTY. A standard keyboard commonly used on North American and some European PC keyboards. “QWERTY”
refers to the arrangement of keys on the left side of the third row of keys.
R
Reflectance. Amount of light returned from an illuminated surface.
Resolution. The narrowest element dimension which is distinguished by a particular reading device or printed with a
particular device or method.
RF. Radio Frequency.
RS-232. An Electronic Industries Association (EIA) standard that defines the connector, connector pins, and signals
used to transfer data serially from one device to another.
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.
SPP. Serial Port Profile.
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