Datalogic DS4600A, Справочное руководство

Страница: 58 / 63

GLOSSARY
Advanced Code Reconstruction
The Advanced Code Reconstruction technology allows reconstructing and reading
damaged or very tilted barcodes. See par. 3.1.
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. 2.2 and 2.5. 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.
46