Table of Contents
Advertisement
56
Nominal
Nominal Size
NOTIS Editing
Parameter
Percent Decode
Print Contrast Signal (PCS)
Programming Mode
Quiet Zone
Random Access Memory (RAM)
Reflectance
Resolution
RTS
RxD
Scan Area
Scanner
Scanning Mode
Revision: 2.0 , technical changes excepted
of one information bit. A zero bit consists of a narrow bar followed by a wide space,
while one bit consist of a wide bar followed by a narrow bar. The zero bit is one unit
bar followed by a two-unit space and the one bit is a two-unit bar followed by a one
unit space. The primary application for the MSI code is marking of retail shelves
and subsequent scanning with portable devices for inventory purposes.
The exact (or ideal) intended value for a specified parameter. Tolerances are
specified as positive and negative deviations from this value.
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).
An option that strips the start and stop characters from a decoded Codabar
symbol.
A variable that can have different values assigned to it.
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%.
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.
The state in which a scanner is configured for parameter values. See Scanning
Mode.
A clear space, containing no dark marks, which precedes the start character of a
bar code symbol and follows the stop character.
Memory devices where any location in memory can be accessed as
quickly as any other location.
Amount of light returned from an illuminated surface.
The narrowest element dimension which can be distinguished by a particular
reading device or printed with a particular device or method.
Request to send.
Received data.
Area intended to contain a symbol.
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:
Light source (laser or photoelectric cell) - illuminates a bar code.
Photo detector - registers the difference in reflected light (more light reflected from
spaces).
Signal conditioning circuit - transforms optical detector output into a digitized bar
pattern.
The scanner is energized, programmed, and ready to read a bar code.
Advanced Scanner Configuration Guide
Advertisement
Table of Contents
