Wasp WPS100 Specifications download pdf (Page 459)

Glossary-5

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 (PCS)

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.

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 is distinguished by a

particular reading device or printed with a particular device or method.

RSS Reduced Space Symbology: A family of space efficient symbologies

developed by UCC.EAN.

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.

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Wasp WPS100 Specifications Page 459