Microscan MS-890, User Manual, Page: 304 / 308

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MS-890 Industrial Automation Scanner User Manual
Glossary of Terms
Depth of Field — The distance between the minimum and maximum range in which a
scanner can read symbol.
Discrete I/O — Inputs and outputs characterized by discrete signal transitions.
EPROM — Erasable, programmable, read-only memory.
Embedded Memory — Onboard memory device such as EPROM or flash.
End of Read Cycle — The time or condition at which the scanner stops expecting symbol
data to decode.
External Edge — Allows a read cycle to be initiated by a trigger signal from an object
detector when it detects the appearance of an object (rising edge). The read cycle ends
with a good read, a timeout, or a new trigger.
External Level — Allows a read cycle to be initiated by a trigger signal from an object
detector. The read cycle ends when the object moves out of the detector’s range.
Fixed Symbol Length — Increases data integrity by ensuring that only one symbol length
will be accepted.
Flash Memory — Memory that can be changed by downloading new code.
Focal Length — The distance measured from the scanner to the center of the depth of
field, or
focal
point.
Focus — The point at which the tip of the scan beam is at its narrowest.
Full Duplex — Auxiliary port data is sent directly to the host but not displayed on the auxiliary
port screen.
Gain — Optimal signal strength.
Good Read — A decode. The successful scanning and decoding of the information
encoded in a symbol.
Half Duplex — Auxiliary port data is sent directly to the host and displayed on the auxiliary
port screen.
Intercharacter Delay — The time interval in milliseconds between individual characters
transmitted from the scanner to the host.
Intercharacter Gap — The extra space between the last element of one character and
the first element of the adjacent character of a specific symbol.
Ladder Orientation — An orientation in which a symbol’s bars are parallel to its direction of
travel.
Large Intercharacter Gap — Allows the scanner to read symbols with gaps between
characters that exceed three times (3x) the narrow element width.
Laser Framing — Setting scan width size by adjusting the on/off duration of the laser
beam.
Laser On/Off — When enabled, the laser is ON only during the read cycle, provided the
scanner is enabled for a Serial or External trigger.
LED — Light emitting diode.
Longitudinal Redundancy Check (LRC) — An error-checking routine that verifies the
accuracy of transmissions.