Worth Data 5000 TriCoder s Especificaciones descargar pdf (Pagina 8)

Other bar code types are similarly constructed. UPC and EAN bar codes have

four widths of bars and spaces; so does Code 128.

Bar Code Selection Recommendations

For new bar coding projects that don't have industry or customer standards,

Code 39 is the typical non-food standard, mostly because almost all bar code

equipment reads/prints Code 39. However, Code 39 produces relatively long

bar codes; it is not particularly efficient in it’s bar code density (the maximum

density is 9.4 characters per inch, including 2 start/stop characters). Where the

label width is an issue and there is numeric data or lower case letters in the data,

Code 128 is the best alternative. Code 128 has an extra-efficient numeric-only

packing scheme to produce very dense bar codes, and Code 128 can encode all

128 ASCII characters. Not all bar code readers read Code 128, so before settling

on it as a standard, make sure that your reader is 128 capable. Only only one

vendor has promoted code 93; it requires two characters to make Full ASCII;

and it doesn't have a numeric packing option. For these reasons, Code 128 is

usually preferable over Code 93.

The larger the width of the elements, the more space it takes to print the bar

code; therefore, the lower the bar code density. The thinner the bar and spaces,

the less space is required and the higher the bar code density. Look at the

samples on the next page to see examples of different densities.

The lower density bar codes are more reliably printed and more consistently

read than higher density bar codes due to the fact that minor variations (from

printing or damage) are much more serious with high-density bar codes -- the

percentage of distortion is larger.

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Worth Data 5000 TriCoder s Especificaciones Pagina 8