Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 157)

Glossary
G–2
CRT
Acronym for Cathode Ray Tube. In
this manual, refers to the
programming terminal.
D
decoder logic
The electronic package which
receives the signals from the scanner,
interprets the signals into meaningful
data and provides the interface to
other devices.
E
EAN
Acronym for European Article
Numbering System, the international
standard bar code for retail food
packages.
H
helium neon laser
The type of laser most commonly
used in bar code scanners. Because
the laser beam is bright red, bars
must not be printed with red ink
since they would be indistinguishable
from the background.
Hex
Abbreviated form of the word
hexadecimal.
Hexadecimal
A base 16 numbering system.
Host port
Serial port which supports RS–232,
RS–422, and RS–485
communications interfaces through
which a device can control the
operation of the decoder and receive
decoded information.
I
Interleaved 2–of–5 bar code
A bar code in which characters are
paired together using bars to
represent the first character and
spaces to represent the second.
L
LAN
Acronym for Local Area Network.
A system of computers,
programmable controllers, terminals,
etc which are linked by
communications lines.
LSAP
An acronym for Link Service Access
Point. The device which controls the
data link in an RS–485
communications network.
M
match code
A sequence that specifies a code type
and character string which can be
compared against decoded (valid)
bar codes
match code table
A list of match codes that is
compared to each valid read.
misread
A condition which occurs when the
data output of a reader does not agree
with the encoded data presented.
modulo check digit or character
A calculated character within a data
field used for error detection. The
calculated character is determined by
a modulus calculation on the sum or
weighted sum of the data field
contents.