Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 344)

Glossary G–3
Publication 2755-833
character
A single groups of bars and spaces representing an individual
number, letter or punctuation mark. A graphic shape representing a
letter, number or symbol.
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.
code type
See symbology.
coordinated mode
A scanning mode in which the symbols per package setting can be
satisfied by either or both scanners.
continuous code
A bar code or symbol that does not use an intercharacter gap
between characters in the code. Code 128 is an example of a
continuous code.
controller
A unit, such as a programmable controller, which controls machine
or process elements.
CRT
A terminal containing a cathode ray tube.
D
decode
The process of translating a bar code into data characters using a
specific set of rules for each symbology.
decoder
A device used to decode, or make usable, a digital or analog signal
transmitted from a scanning device.
decode mode
The method by which the decoder starts and stops the decoding
process. The two basic methods of decoding are triggered and
continuous.
decoder logic
The circuitry which receives the signals from the scanner, interprets
the signals into meaningful data and provides the interface to other
devices.
discrete code
A bar code or symbol where the space between characters,
intercharacter gap, are not part of the code; as with Code 39. See
continuous code.