AMT Datasouth Fastmark M1 Guide de l'utilisateur télécharger pdf (Page 363)

Barcode Symbology Terminology

Term Description

Barcode

An array of parallel rectangular bars and spaces arranged according to the

encodation rules of a particular symbol specification in order to represent

data in machine-readable form. For the purposes of this guideline the term

“bar code” includes linear (for example, Code 39 and Code 128), two-

dimensional (for example, Data Matrix and MicroPDF417), and composite

(for example CC-A linked to GS1 DataBar Omnidirectional) machine-

readable symbols.

Barcode Character

A single group of bars and spaces that represent an individual letter,

number, punctuation mark or other symbol.

Barcode Density

The number of data characters that can be represented in a linear unit of

measure. Barcode density is a function of the “X” dimension, element

width ration, and intercharacter gap.

Barcode Symbol

An array of rectangular bars and spaces that are arranged in a

predetermined pattern following specific rules to represent elements of

data that are referred to as characters. A bar code symbol contains a

leading quiet zone, start pattern data character(s) including a check

character (if any), stop pattern, and a trailing quiet zone.

Bar Height The bar dimension perpendicular to the bar width. Also called bar length.

Bar Width

The perpendicular distance across a bar measured from a point on one

edge to a point on the opposite edge. Each point will be defined as having

a reflectance that is 50 percent of the difference between the background

and bar reflectance.

Character

Term Description

Data Character A letter, digit, or other member of the ASCII character set.

Symbol Character

A unique bar and/or space pattern, or a dark and light cell pattern, which is

defined for a specific symbology. There is not necessarily a one-to-one

unique correlation between symbol characters and data characters.

Depending on the symbology, symbol characters may have a unique

associated symbol value.

Character Set

Those characters available for encodation in a particular automatic

identification technology.

Check Character

A digit or character calculated from the data and appended as part of the

data string to insure that the data is correctly composed and transmitted.

Code 39

The 3 of 9 bar code is a variable length, discrete, self-checking,

bidirectional, alphanumeric bar code. Its character set contains 43

meaningful characters: 0-9, A-Z, -, ., $, /, %, *, and space. Each character

is composed of nine elements: five bars and four spaces. Three of the nine

elements are wide (binary value 1), and six elements are narrow (binary

value 0). The character (*) is used for both start and stop character.

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AMT Datasouth Fastmark M1 Guide de l'utilisateur Page 363

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