Microscan MS-810, Руководство пользователя

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Chapter A
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MS-810 Industrial Scanner User’s Manual
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Appendix N — Glossary of Terms
Autodiscriminate . The ability to decode several different bar code symbologies with-
out 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 sec-
ond. 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 char-
acter, 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 fea-
tures 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 connec-
tivity for various circuits and pins.
Counter . Memory space provided to keep track of read cycle events.
Daisy Chain . Linkage of primary and successive scanners to allow data to be cascaded
up to the host via aux port connections.
Decode Rate. The number of good reads per second decoded by the scanner.
Depth of Field. The distance between the minimum and maximum range in which a
scanner can read bar code labels.
EPROM . Erasable, programmable, read only memory.
End of Read Cycle. The time at which the scanner 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 scanner to the center of the depth of
field, or
focal
point.
Good Read. The event that occurs when a label's data is accurately scanned and
decoded.
Intercharacter Gap. The extra space between the last element of one character and
the first element of the adjacent character of a specific bar code symbol.