Rockwell Automation 2755 High Performance VLD Scanner - Manual (Page 49)

Glossary
Glossary
AIM
Acronym for Automatic Identification Manufacturers.
Alignment
The relative position of a scanner or light source to the target of the
receiving element.
Alphanumeric
The character set containing letters, numbers, punctuation marks,
and symbols.
Aspect Ratio
The ratio of height to width of a bar code symbol. A code twice as
high as wide would have an aspect ratio of 2; a code twice as wide as
high would have an aspect ratio of
!@2 or 0.5.
Average Background Reflectance
Expressed as a percent, this is the simple arithmetic average of the
background reflection reading from at least five different points on a
sheet.
Bar
The dark element of a printed symbol.
Bar Code
The vertical bars and spaces found in a bar code symbol.
Bar Code Density
The number of characters which can be represented in a linear inch.
Bar Code Label
A label that carries a bar code and is suitable to be affixed to an
article.
Bar Code Symbol
A group of vertical bars that represent a character or group of
characters whose spacing is determined by a specific set of rules. In
most cases, human readable characters are printed below the bars.
Bar Length
The bar dimension perpendicular to the bar width.
Bar Width
The thickness of a bar measured from the edge closest to the
symbol’s start character to the trailing edge of the same bar.