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Glossary-5
Glossary
Nominal
The exact (or ideal) intended value for a specified parameter. Tolerances are
specified as positive and negative deviations from this value.
Nominal Size
Standard size for a bar code symbol. Most UPC/EAN codes can be used
over a range of magnifications (e.g., from 0.80 to 2.00 of nominal).
NOTIS Editing
An option that strips the start and stop characters from a decoded Codabar
symbol.
Parameter
A variable that can have different values assigned to it.
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 = (R
L
- R
D
) / R
L
, where R
L
is the reflectance factor of
the background and R
D
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.
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.
Summary of Contents for LS 1220
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Page 4: ...LS 1220 Product Reference Guide 70 12072 03 Revision A January 2003 ...
Page 23: ...1 8 LS 1220 Product Reference Guide Figure 1 3 LS 1220 Connector ...
Page 33: ...2 10 LS 1220 Product Reference Guide ...
Page 71: ...8 14 LS 1220 Product Reference Guide Figure 8 1 Hardware Handshaking ...
Page 97: ...9 6 LS 1220 Product Reference Guide Code Lengths cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Page 105: ...9 14 LS 1220 Product Reference Guide Prefix Suffix Values cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Page 108: ...9 17 Parameter Menus UPC Security Zone cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Page 120: ...9 29 Parameter Menus Intercharacter Delay cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
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