Rockwell Automation 2755-L7, -L9 Scanners - Manual (Page 39)

A–B
G Glossary
G–1
A
AIM
Acronym for Automatic Identification Manufacturers.
alignment
The relative position of a scanner or light source to the target or the receiving
element.
alphanumeric or alphameric
The character set which contains letters, digits, and other characters such as
punctuation marks.
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 or 0.5.
attended system
A scanner/decoder combination that must be activated, or attended, by an
operator.
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.
average edge
An imaginary line bisecting the irregularities of the character edge.
B
background
The area surrounding a printed symbol.
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 lineal inch.
bar code label
A label that carries a bar code and is suitable to be affixed to an article.
bar code reader
A device used to identify and read a bar code symbol. Also know as a
decoder
bar code symbol
A group of vertical bars ,that represents a character or group of characters
whose spacing is determined by a specific set of rules. In most cases, human
readable characters are also printed below the bars.