Glossary GL-7
NVM Non-Volatile Memory.
ODI See Open Data-Link Interface.
Open Data-Link Interface (ODI) Novell’s driver specification for an interface between network
hardware and higher-level protocols. It supports multiple protocols
on a single NIC (Network Interface Controller). It is capable of
understanding and translating any network information or request
sent by any other ODI-compatible protocol into something a
NetWare client can understand and process.
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 = (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.
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.
RAM Random Access Memory. Data in RAM can be accessed in random
order, and quickly written and read.
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.
ROM Read-Only Memory. Data stored in ROM cannot be changed or
removed.
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.
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.
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