System Card
Barcode is a set of different width, parallel to the adjacent bar
and space, according to some encoding rules to form the symbol, can
represent letters, numbers and other information, usually a bar
code can hold 20 or less letters, numbers, information.
Bar Code Technology to study how to use barcode label information,
and barcode identification information into the computer can
recognize the language, automatic identification using barcode
technology.
Computer processing
Bar code / magnetic card reader is a bar code / magnetic card
application system acquisition equipment, it can quickly and
accurately capture the bar code / magnetic card, said data
information, and data are sent to computer processing. Computer is a bar code / magnetic card applications in data storage
and processing equipment. As computer storage capacity, fast speed, many complicated data
processing becomes easy, rapid, and timely. Computer for management, can significantly reduce workers in
various industries services labor intensity, improve efficiency,
can be completed in some areas could not be done by hand. Bar code / magnetic card system is the key data processing data
processing. Can be said that all existing computer database management system
may be related to bar code / magnetic card equipment.
Bar code magnetic card key technologies
The rapid development of barcode and magnetic card technology in
many fields widely aroused the attention of many countries now in
the world, in bar code card technology and its family of products,
research and development, production and operation of up to
thousands of manufacturers, product variety up to thousands of sufficient size to become high-tech industries.
Bar code card technology should be involved from the application
point of view the key points to be as follows:
1. Coding
2. Loading Technology
3. Acquisition
4. Decoding Technology
5. Transmission technology
6. Processing
Bar code card equipment specifications are generally made in these
points, different bar code card equipment of their differences are
generally due to the different surface points generated by focusing
on the application engineers to do to be a number of indicators in
this meaning there is a clear understanding in order to facilitate
selection.
1. Coding
Bar code, magnetic card information is loaded on numbers, letters,
figures, letters are read by a certain standard code number string. As the large difference between bar code card, the following should
be discussed separately.
(1) bar coding
Bar coding technology mainly bar coding rules and standards.
Bar code system of encoding rules is to formulate standards and the
bar code symbols to identify the main basis.
At present, the international system of common code are the
following:
① UPC code
In 1973, the United States took the lead in the domestic business
system applications. The code system is mainly used for business systems. The code length is fixed at 12.
② EAN code
In 1977, the European Economic Community countries in accordance
with the UPC code standards EAN European Article Numbering Code. EAN code There are two types: EAN-13 codes and EAN-8 .
③ cross 25 yards
Cross 25 yards (Interleaved 2 of 5 Code) is a variable length of
continuous self-checking digital code system.
④ 39
Code 39 (Code 3 of 9) is a discrete variable length character type
code letter from Check system.
⑤ Codabar (codabar)
Codabar is a variable-length discrete self-checking digital code
system.
It is commonly used in warehouses, blood banks and air express
parcels in the management.
⑥ 128 (Code128)
128 yards (Code128) is a continuous variable length alphanumeric
code system.
