Worth Data 5000 TriCoder s Spécifications télécharger pdf (Page 5)

As the wand is passed over the bar code, the scanner creates a low electrical

signal for the spaces (reflected light) and a high electrical signal for the bars

(nothing is reflected). The duration of the electrical signal determines wide vs.

narrow elements. This signal can be "decoded" by the bar code reader's decoder

into the characters that the bar code represents. The decoded data is then passed

to the computer in a traditional data format.

Types of Bar Codes

There are lots of different bar codes. Some bar codes are numeric only, (i.e.

UPC, EAN, Interleaved 2 of 5). Some bar codes are fixed length, (i.e. UPC-A is

12 digits, UPC-E is 6 digits, EAN-13 is 13 digits, and EAN-8 is 8 digits). Some

bar codes can have numbers and alphabetic characters, (i.e. Code 93, Code 128,

and Code 39). One bar code allows you to encode all 128 characters, (Code

128) and other bar codes allow you to encode a lot of data into a small space

(PDF417 and MaxiCode).

Many were invented some time ago and have been superseded by newer bar

codes. Some industries standardized on older bar codes before the better ones

had been invented, thus there is a continuing requirement for their use in

particular industries.

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Worth Data 5000 TriCoder s Spécifications Page 5