Wasp WLP 4170, Руководство по программированию

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8
Bar codes are symbols consisting of a series of bars and spaces which can be
applied to packages, cartons, bottles, and other commercial products. The bars
and spaces in each symbol are grouped in such a way to represent a specific ASCII
character or function. The interpretation of these groups is based on a particular
set of rules called symbologies. Various symbologies have been developed for
particular applications. Some examples are shipping and receiving, manufacturing,
retail, healthcare, transportation, document processing and tracking, and libraries.
The resolution of a bar code is dependent on the narrowest element of a bar code
(X dimension), and can vary from high density (nominally less than 0.009 in./0.23
mm), medium density (between 0.009 in./0.23 mm and 0.020 in./0.50 mm), and
low density (greater than 0.020 in./0.50 mm). Medium and low densities are the
most common since these are the easiest to read (scan) with nearly all scanning
devices. Wasp WLP 4170 CCD Scanner can read bar codes with X-dimensions as
low as 4 mils (0.10mm).
Wasp WLP 4170 CCD Scanner can read the most popular linear bar code
symbologies including Code 39, Code 93, Code 128, Interleaved 2 of 5, UPC-A,
UPC-E, EAN/JAN-8, EAN/JAN-13, Codabar, and MSI Plessey, and also the 2D bar
code symbology PDF417.
Please see test chart on pages 30-33.
Chapter 4
Bar Code Symbologies