Symbol LS4000P Series, Product Reference Manual

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Glossary-5
Glossary
Random Access
Memory (RAM) Memory devices where any location in memory can be accessed as quickly as
any other location.
Reflectance Amount of light returned from an illuminated surface.
Resolution The narrowest element dimension which can be distinguished by a particular
reading device or printed with a particular device or method.
RTS Request to send.
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.