Symbol Technologies LS 2106 Percent Decode, Print Contrast Signal, Programming Mode, Quiet Zone

	Glossary
Percent Decode	The average probability that a single scan of a bar code would result
	in a successful decode. In a well-designed bar code scanning system,
	that probability should approach near 100%.
Print Contrast Signal	Measurement of the contrast (brightness difference) between the bars
(PCS)	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.
Programming Mode	The state in which a scanner is configured for parameter values. See
	SCANNING MODE.
Quiet Zone	A clear space, containing no dark marks, which precedes the start
	character of a bar code symbol and follows the stop character.
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.
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.

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