Rockwell Automation 2755 2D Hand-Held Scanner - Manual (Page 118)

G–4 Glossary
Publication 2755-6.4
Code
Set of unambiguous rules specifying the way in which data may be
represented.
Codeword
In PDF417, a single group of bars and spaces (4 bars and 4 spaces,
for a total of 17 module widths) which represents one or more
numbers, letters, or other symbols.
Codeword PD (Codeword Percent Decode)
Within a PDF417 symbol, the percentage of codewords which
decoded successfully; the number of good codewords divided by the
total number of codewords (data codewords plus error correction
codewords).
Code Length
Number of data characters in a bar code between the start and stop
characters, not including those 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.
Continuous Code
A bar code or symbol in which all spaces within the symbol are parts
of characters. There are no intercharacter gaps in a continuous code.
The absence of gaps allows for greater information density.
Country Flag
In EAN-8 and EAN-13 codes, two or three digits which appear
immediately following the left guard bar pattern.