Konica-minolta Darwin VDP Software Instrukcja Użytkownika Pobierz pdf (Strona 9)

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TEC-IT Barcode Software Reference

3.3 Barcode Glossary

As follows you will find a short explanation about technical terms which are used in the barcode

technology.

Bar

A bar is represented by the dark or black elements in a barcode.

Space

The white or lighter elements in a barcode are called spaces.

Barcode density

The density of the barcode refers to how much space is required

for the needed characters (characters per Inch or centimeter)

Element

Represents both a bar and a space.

Module

A module is the smallest element of a barcode. The width of the

single bars and spaces is a (mostly integer) multiples of the basic

width of the module.

Module width

         

inches or in so-called mils (one mil = 1/1000 millimeter).

The module width is usually abbreviated with the letter X

X Dimension

(see Module width).

Quiet zone

An area free of any printing or marks that precedes the start

character of a barcode and follows the stop character.

The required minimal size of the quiet zone depends on the

barcode type. As a rule, the quiet zone should be ten times the

dimension of the module width or at least 1/4 inch (6.5 mm).

Human Readable

Text

This term refers to the entire encoded information of a barcode

shown in readable form. It is usually printed below the code. For

2D codes no human readable text is used.

Discrete Codes

Each character begins and ends with a bar. The spacing

between characters is not part of the code.

Continuous Code

The spaces between the characters are also part of the code. An

example of a continuous code is the Code 2/5 Interleaved.

Start and Stop

Characters

Distinct characters used at the beginning and end of each

barcode symbol that provide the scanner with start and stop

reading instructions as well as scanning direction.

Self-checking

Code

Self-checking code uses the same pattern for each character.

For example, this can be five elements where two of these

elements are wide and three are narrow. Any deviation from this

pattern would result in an error.

Check Digit

One or more characters included within the barcode which are

used to perform a mathematical check to ensure the accuracy of

the scanned data. Check digits are mandatory with certain codes

or are even built into the symbology (as for Code-128)

Bearer Bars

These are bars printed above and below the symbol. The bearer

bars are eliminating partial reads (as drawn in the example on

the right). Sometimes the complete symbol is surrounded by

bearer bars (e.g. ITF-14).

Substitution

Error

Due to reading errors a character is replaced by another during

scanning. Substitution errors can be excluded by adding a check

digit.

Synchronizing

Bars

These bars are synchronizing the barcode reader. E.g. UPC-A

and EAN-13 have synchronizing bars at the beginning, in the

middle and at the end of the symbol.

No-Read

A failure to decode, resulting in no output.

Misread

The data output of a reader/decoder does not agree with the data

encoded in the barcode field. This yields to substitution errors.

Table 1: Barcode Glossary

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