Glossary - 6
MT2070/MT2090 User Guide
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
.
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.
Summary of Contents for MT2070
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Page 501: ...Advanced Data Formatting 14 91 Alphanumeric Keyboard Space Dash ...
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Page 549: ...Appendix C Sample Bar Codes UPC A UPC E 0 12345 67890 5 0 123456 5 ...
Page 551: ...Sample Bar Codes C 3 Trioptic Code 39 Code 93 Code 11 456123 12345ABCDE Æ1234567890Æ ...
Page 553: ...Sample Bar Codes C 5 PDF417 Data Matrix Maxicode ...
Page 554: ...C 6 MT2070 MT2090 User Guide QR Code US Postnet UK Postal ...
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Page 559: ...Appendix E Alphanumeric Bar Codes Alphanumeric Keyboard Space ...
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