Glossary - 6
DS3578 With FIPS Digital Scanner Product Reference 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 SYMBOL DS3578
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Page 197: ...RS 232 Interface 8 23 ...
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Page 366: ...B 8 DS3578 With FIPS Digital Scanner Product Reference Guide ...
Page 367: ...Appendix C Sample Bar Codes UPC A UPC E 0 12345 67890 5 0 123456 5 ...
Page 369: ...Sample Bar Codes C 3 Trioptic Code 39 Code 93 Code 11 456123 12345ABCDE Æ1234567890Æ ...
Page 371: ...Sample Bar Codes C 5 PDF417 Data Matrix Maxicode ...
Page 372: ...C 6 DS3578 With FIPS Digital Scanner Product Reference Guide QR Code US Postnet UK Postal ...
Page 373: ...Appendix D Alphanumeric Bar Codes Alphanumeric Keyboard Space ...
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Page 376: ...D 4 DS3578 With FIPS Digital Scanner Product Reference Guide Alphanumeric Keyboard continued ...
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Page 379: ...Alphanumeric Bar Codes D 7 Alphanumeric Keyboard continued 5 6 7 8 9 End of Message Cancel ...
Page 381: ...Alphanumeric Bar Codes D 9 Alphanumeric Keyboard continued G H I J K L ...
Page 383: ...Alphanumeric Bar Codes D 11 Alphanumeric Keyboard continued S T U V W X ...
Page 385: ...Alphanumeric Bar Codes D 13 Alphanumeric Keyboard continued e f g h i j ...
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Page 418: ...Glossary 8 DS3578 With FIPS Digital Scanner Product Reference Guide ...
Page 426: ...Index 8 DS3578 With FIPS Digital Scanner Product Reference Guide ...
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