Datalogic DS5100, Справочное руководство

Страница: 159 / 164

143
GLOSSARY
ACR4 (Advanced Code Reconstruction)
This is a powerful code reconstruction technology (ACR 4). The new fourth generation ACR
considerably increases the code reconstruction reading capability in the case of damaged or
very tilted barcodes.
Aperture
Term used on the required CDRH warning labels to describe the laser exit window.
Barcode
A pattern of variable-width bars and spaces which represents numeric or alphanumeric data
in machine-readable form. The general format of a barcode symbol consists of a leading
margin, start character, data or message character, check character (if any), stop character,
and trailing margin. Within this framework, each recognizable symbology uses its own unique
format.
Barcode Label
A label that carries a barcode and can be affixed to an article.
Baud Rate
A unit used to measure communications speed or data transfer rate.
CDRH (Center for Devices and Radiological Health)
This organization (a service of the Food and Drug Administration) is responsible for the
safety regulations governing acceptable limitations on electronic radiation from laser devices.
Datalogic devices are in compliance with the CDRH regulations.
Code Positioning
Variation in code placement that affects the ability of a scanner to read a code. The terms
Pitch, Skew, and Tilt deal with the angular variations of code positioning in the X, Y and Z
axes. See pars. 3.2.1 and 3.4. Variations in code placement affect the pulse width and
therefore the decoding of the code. Pulse width is defined as a change from the leading edge
of a bar or space to the trailing edge of a bar or space over time. Pulse width is also referred
to as a transition. Tilt, pitch, and skew impact the pulse width of the code.
Decode
The process of translating a barcode into data characters using a specific set of rules for
each symbology.
Decoder
As part of a barcode reading system, the electronic package which receives the signals from
the scanner, performs the algorithm to interpret the signals into meaningful data and provides
the interface to other devices. The decoder is normally integrated into the scanner.
EAN
European Article Number System. The international standard barcode for retail food
packages.
FLASH
An on-board non-volatile memory chip.