Rockwell Automation 2755 Cordless Hand-Held Scanner - Manual (Page 99)

G–2 Glossary
Publication 2755-6.3
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 an error
is decoded.
Codabar
A discrete self-checking code with a character set consisting of digits
0 to 9 and six additional characters: (- $ : / , +).
Code 128
A high density symbology which allows the controller to encode all
128 ASCII characters without adding extra symbol elements.
Code 3 of 9 (Code 39)
A versatile and widely used alphanumeric bar code symbology with
a set of 43 character types, including all uppercase letters, numerals
from 0 to 9, and 7 special characters (- . / + % $ and space). The
code name is derived from the fact that 3 of 9 elements representing
a character are wide, while the remaining 6 are narrow.
D
Decode
To recognize a bar code symbology (e.g., UPC/EAN) and then
analyze the content of the specific bar code scanned.
Discrete 2 of 5
A binary bar code symbology representing each character by a group
of five bars, two of which are wide. The location of wide bars in the
group determines which character is encoded; spaces are
insignificant. Only numeric characters (0 to 9) and start/stop
characters may be encoded.