Allen-Bradley Series B

Glossary
G–5
misread
A condition which occurs when the
data output of a reader does not agree
with the encoded data presented. See
substitution error.
module
The term module is used by the Uniform
Product Code Council in it descriptions
of the UPC code. A module is the
narrowest unit of measure in the code. A
module may be “black” or “white”.
modulo check digit or character
A calculated character within a data
field used for error detection. The
calculated character is determined by
applying a code algorithm to the data
field contents.
modulus 43 check character
Used in Code 39 for data security in
addition to the built–in self–checking
characters. The check–character is
the modulus 43 sum of all of the
character values in a given message
and is the last character in the code.
moving beam scanner
A device which dynamically
searches for a bar code pattern by
sweeping a moving optical beam
through a field of view.
N
nanometer
Unit of measure used to define the
wavelength of light. 10
9
meters.
no–read, non–read, non–scan
The absence of data at the scanner
output after an attempted scan due to
no code, defective code, scanner
failure or operator error.
nominal size
The standard size for a bar code symbol.
Most codes can be used over a range of
magnifications from 0.80 to 1.20,
nominal.
numeric
A machine vocabulary that includes
only the numbers as contrasted to
alphanumeric which includes both
letters and numerals.
O
OCR
Acronym for Optical Character
Reader. An information processing
device that scans and decodes
human readable OCR symbols.
OCR–A
An abbreviation commonly applied
to the character set contained in
ANSI Standard x3.17–1974.
OCR–B
An abbreviation commonly applied
to the character set contained in
ANSI Standard x3.49–1975.
off–line
Refers to devices that operate
independently of a central processing
unit.
on–line
An operation in which peripheral
devices are connected directly to the
computer central processor unit.