Microscan MS-3000 User Manual page 121

Glossary of Terms
Noread. A non-read. A condition that occurs when the decoder is set up to
decode labels, and no labels are scanned during the read cycle.
Number of Scans Calculation. The number of times a bar code label is
scanned by the decoder during one pass through the laser beam.
Object Detector. A photo electric device used to sense to presence or
absence of an object.
Operational Commands. Serial commands from the host to the decoder to
control current operating parameters, counters, master label operations,
and program management.
Oval Spot. An elongated laser beam involving custom optics that is
designed to project lengthwise with the label's bars and spaces.
Picket Fence Label Orientation. A bar code label in which the bars are
perpendicular to the direction of travel.
Pitch. Label (or scan head) rotation around the center line perpendicular to
the label's bars.
Point-to-Point. A protocol consisting of a single communications event,
typically used to connect a bar code reader to a CRT terminal or a host
computer.
Polled Protocol. A protocol in which each decoder or other device has an
assigned address which is used by the host when requesting data.
Port. Logical circuit for data entry and exit. (One or more ports may be
included within a single connector.)
Protocol. The rules for communication between devices, providing a
means to control the orderly communication of information between linked
devices.
Quiet Zones. Specified "clear" (nonprinted) areas immediately before and
after the bar code symbol. The area is usually white (for black and white bar
code) and at least 10 times the width of the narrowest bar, as measured in
thousands of an inch. The zones can be other than white as long as their
densities remains consistent and they have the required contrast relative to
the bars.
Read Cycle. A programmed period of time or condition during which the
decoder will accept bar code label input.
Read Range. The distances in which a label can be reliably read, as mea-
sured from the front of the scan head. See "Depth of Field."
Read Rate. The percentage of reads decoded by the decoder.
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MS-3000 Single Head Decoder User's Manual