Rockwell Automation 2755 AdaptaScan Bar Code Readers - Manual (Page 89)

Glossary G–11
symbology
The conventions, or rules, which govern the formation of characters
and strings of characters in a bar code symbol.
symbology identifier
An optional three character code which may prefix transmitted data
from a bar code reader indicating the symbology read and any
options enabled in the reader or special features of a symbology
encountered (presence of FNC 1 in Code 128).
T
tag
A collection of information associated with a single variable or I/O
point.
two-width symbology
A bar code symbology whose bar and spaces are characterized
simply as wide or narrow. Codabar, Code 39, and Interleaved 2 of 5
are examples of two-width symbologies.
U
UPC
Acronym for Universal Product Code. The standard bar code type
for retail food packaging in the United States.
V
void
The undesirable presence of an area of high reflectance in a bar.
W
window
A display area that the users interacts with to operate a tool.
word
A unit of data which contains two bytes (16 bits).