Microscan MS-810, User Manual

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Chapter A
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MS-810 Industrial Scanner User’s Manual
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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.)
Primary Scanner. First scanner in a daisy chain mode and linked directly to the host
and in tandem to succeeding scanners.
Protocol. The rules for communication between devices, providing a means to control
the orderly flow 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.
RAM. (Random Access Memory) Memory that is lost after power is recycled to the unit.
Read Cycle. A programmed period of time or condition during which the scanner will
accept bar code label input.
Read Range. The distances in which a label can be reliably read, as measured from the
front of the scanner. See “Depth of Field.”
Reflectance Threshold. A user-defined setting of reflection (a few digits higher than an
empty space reading) that is a point-of-reference for the MS-sensor. A reading lower than
the threshold indicates that an object is not present whereas a higher reading indicates
the presence of an object.
Relay Driver. A TTL signal sent by the scanner. The output is determined by the relay
driver selection (by operational command).
ROM . (Read Only Memory) Memory that cannot be changed.
Scanner. A scanning device that is comprised of a scan head and a decoder integrated
in one package.
Scan Rate . Number of scans per second that the scanner projects.
Scan Width . That portion of the scan line in which a label can be read.
Serial Commands . Online data strings (including configuration and operations) from a
host or other terminal to the scanner, that are always preceded by a < left angle bracket
symbol and followed by a > right angle bracket symbol.
Serial Configuration (Host Configuration). Serial command specifically for changing
configuration and distinguished from operational command by the fact that they modify
the non-volatile for power up configuration.
Skew . Label (or scanner) rotation around the center of the skew axis.
Specular Reflection. The direct, mirror-like reflection of laser light back to the scan-
ner, causing over-light saturation. For the MS-810 scanner, specular reflection is avoided