Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 349)

Glossary G–8
Publication 2755-833
scanner
A device that optically scans bar code symbols and converts the
optical information into digital or analog form and sends it to a
decoder.
self-checking
A bar code or symbol using a checking algorithm which can be
applied to each character to guard against undetected errors. Non-
self-checked codes may employ a check digit or other redundancy in
addition to the data message.
space
The lighter element of a bar code formed by the background between
bars.
start/stop character
A bar code character that provides the scanner with information
about how the code is bounded and its orientation. The start
character is normally at the left-hand end of a horizontal code and
adjacent to the most significant character. The stop character is
normally at the right-hand end of a horizontal code and adjacent to
the least significant character.
step ladder orientation
A bar code or symbol presented in such a manner that the direction
of travel of the symbol is parallel to the cars and spaces of the code
string
A sequence of ASCII characters.
symbol
A combination of characters, including start/stop characters and
check characters, as required, which form a complete scannable
entity.
symbol density
The number of characters per linear inch.
symbol length
The length of the symbol measured from the beginning of the quiet
area adjacent to the start character to the end of the quiet area
adjacent to a stop character.
symbology
The conventions, or rules, which govern the formation of characters
and strings of characters in bar codes. The language of the bar code
symbol. See bar code symbol.
symbols per package
A value that indicates the number of bar code symbols that comprise
a complete package. This value applies only to the triggered mode
of operation.