Rockwell Automation 2755 2D Hand-Held Scanner - Manual (Page 117)

Glossary G–3
Publication 2755-6.4
Byte
On an addressable boundary, eight adjacent binary digits (0 and 1)
combined in a pattern to represent a specific character or numeric
value. Bits are numbered from the right, 0 through 7, with bit 0 the
low-order bit. One byte in memory can be used to store one ASCII
character.
C
Character
A pattern of bars and spaces which either directly represents data or
indicates a control function, such as a number, letter, punctuation
mark, or communications control contained in a message.
Character Set
Those characters available for encodation in a particular bar code
symbology.
CDRH
Center for Devices and Radiological Health. A federal agency
responsible for regulating laser product safety. This agency specifies
various laser operation classes based on power output during
operation.
Check Digit
A digit used to verify a correct symbol decode. The scanner inserts
the decoded data into an arithmetic formula and checks that the
resulting number matches the encoded check digit. Check digits are
required for UPC but are optional for other symbologies. Using
check digits decreases the chance of substitution errors when a
symbol is decoded.
Cluster
One of three subsets of mutually exclusive codeword definitions in
PDF417.
Codabar
A discrete self-checking code with a character set consisting of
start/stop characters (A B C D or * T N E), digits 0 to 9 and six
additional characters: (- $ : / , +).