Glossary of Terms
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MS-860 Industrial Raster Reader User’s Manual
Output. A channel or communications line. Data or discrete signals that are transmit-
ted or displayed by a device.
Output Format. The modification of data output according to a user-defined index of
Extraction and Insertion commands.
Parity. An error detection routine in which one data bit in each character is set to 1 or
0 (zero) so that the total number of 1 bits in the data field is even or odd.
Picket Fence Symbol Orientation. A bar code symbol in which the bars are perpen-
dicular to the symbol’s direction of travel.
Pitch. Symbol (or reader) rotation around the center of a line parallel to the scan beam.
Point-to-Point. A protocol consisting of a single communications event, typically used
to connect a bar code reader to a terminal or host computer.
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 flow of information between linked devices.
Quiet Zones. Specified “clear” (non printed) areas immediately before and after the
bar code symbol. The area is usually white (for black and white symbol) 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 remain consistent and they have the
required contrast relative to the bars.
RAM. (Random Access Memory) Memory that is lost after power is recycled to the unit.
Raster. Multiple, stacked scans produced by a separate oscillating mirror or by a spin-
ning mirror with varying facet angles.
Read Cycle. A programmed period of time or condition during which the reader will
accept symbol input.
Reader. (1) A reader, a bar code device that can read and decode symbols.
(2) A device that reads and decodes 2D matrix codes.
Read Range. The distances in which a symbol can be reliably read, as measured from
the front of the reader. See “Depth of Field.”
Reed-Solomon Error Correction Code. A linear, error correcting block code, suited to
the correction of character errors which could be, in bar or matrix codes, the oblitera-
tion or removal of part of the symbol.
Read Range. The distances in which a symbol can be reliably read, as measured from
the front of the reader. See “Depth of Field.”
Relay. An electrical switch that allows a low power to control a higher one.
Reset. Sets all counters to zero.
Rising Edge. A change of state (to active) that initiates (and in some cases ends) a
read cycle with a new trigger, an edge trigger, or the leading edge of a level trigger.
(See Falling Edge.)
ROM. (Read Only Memory) Memory that cannot be changed.
Reader. A scanning device that is comprised of a scan head and a decoder integrated in
one package.
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