Motorola SYMBOL LS7708 Product Reference Manual page 370

GL-4 Symbol LS7708 Product Reference Guide
Print Contrast Signal
(PCS)
Programming Mode
Quiet Zone
Reflectance
Resolution
RSS
Scan Area
Scanner
Scanning Mode
Scanning Sequence
Self-Checking Code
Space
Specular Reflection
Start/Stop Character
Substrate
Symbol
Symbol Aspect Ratio
Symbol Height
Symbol Length
Measurement of the contrast (brightness difference) between the bars and spaces of
a symbol. A minimum PCS value is needed for a bar code symbol to be scannable.
PCS = (RL - RD) / RL, where RL is the reflectance factor of the background and RD the
reflectance factor of the dark bars.
The state in which a scanner is configured for parameter values. See SCANNING
MODE.
A clear space, containing no dark marks, which precedes the start character of a bar
code symbol and follows the stop character.
Amount of light returned from an illuminated surface.
The narrowest element dimension which is distinguished by a particular reading
device or printed with a particular device or method.
Reduced Space Symbology: A family of space efficient symbologies developed by
UCC.EAN.
Area intended to contain a symbol.
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.
The scanner is energized, programmed, and ready to read a bar code.
A method of programming or configuring parameters for a bar code reading system
by scanning bar code menus.
A symbology that uses a checking algorithm to detect encoding errors within the
characters of a bar code symbol.
The lighter element of a bar code formed by the background between bars.
The mirror-like direct reflection of light from a surface, which can cause difficulty
decoding a bar code.
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.
A foundation material on which a substance or image is placed.
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.
The ratio of symbol height to symbol width.
The distance between the outside edges of the quiet zones of the first row and the
last row.
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.