Rockwell Automation 2755 AtomScan Bar Code Reader - Manual (Page 136)

Publication 2755-6.9
Glossary
Autodiscriminate – The ability to decode several different bar code
symbologies without changing configuration.
AWG – Abbreviation for American Wire Gauge. This is a standard
measuring system for wire sizes, listed from 0 (biggest) to 40
(smallest). A 26 AWG is equivalent to 0.0159 in. (0.405 mm) in
diameter.
Bar Code – Data that has been encoded into an array of parallel bars
and spaces of varying widths.
Bar Code Density – Number of characters per inch or other unit of
measure.
Baud Rate – The term used to describe the number of discrete signal
events per second. In RS-232 and RS-422/485 systems, baud rate is
the same as bits per second (bps).
Code 39 – An alphanumeric bar code with a character set containing
a start/stop character, 10 numbers, 26 letters, 6 symbols, and a space.
This code is discrete, variable length, and self-checking.
Configuration – The method used to change factory default settings
for operational features to match a specific application.
Configuration can be done through menu selection or with serial
commands.
Connector – Physical device (plug or socket) on unit or cable to
provide in/out connectivity for various circuits and pins.
Counter – Memory space provided to keep track of read cycle
events.
Decode Rate – The number of good reads per second decoded by the
reader.
Depth of Field – The distance between the minimum and maximum
range in which a reader can read bar code labels.
EPROM – Erasable, programmable, read only memory.
End of Read Cycle – The time at which the reader stops expecting
label information to decode. This can be caused by a timeout, a
trigger event, or a good read.
Focal Length – The distance measured from the reader to the center
of the depth of field, or focal point.