Rockwell Automation 2755-L7, -L9 Scanners - Manual (Page 40)

Glossary
G–2
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.
bidirectional symbol
A bar code symbol that can be read in complementary (two) directions.
binary code
A power–of–two code; each bit position has a weighted value.
bit
An acronym for Binary Digit. The smallest unit of information in the binary
numbering system. Represented by the digits 0 and 1.
C
CCD
Acronym for Charge Couple Device; a linear image sensor that scans at high
speeds (approximately 4,000 times per second) and detects the presence or
absence of marks passing under the device.
character
A single group of bars and spaces representing an individual number, letter
or punctuation mark. A graphic shape representing a letter, number or
symbol.
character alignment
The vertical or horizontal position of characters with respect to a given
reference line.
character density
The dimension, in linear inches, required to encode one character.
character reading
Reading of alpha or numeric characters,and/or symbols, by optical means.
character set
Those characters available for encoding purposes.
character skew
See skew.
character spacing
The horizontal distance between two adjacent characters.
check digit
A digit included within a symbol whose value is based mathematically on
other characters included in the symbol. It is used to mathematically check
the accuracy of the read.