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General Information
SECTION 1
Laser Indicator
A semiconductor diode (LED--Light Emitting Diode) used as
an indicator, often in digital displays. The semiconductor
uses applied voltage to produce light of a certain frequency
determined by the semiconductor's particular chemical com-
position.
Lead-In Characters
Preamble characters
MIL
1 mil = 1 thousandth of an inch.
Misread (Misdecode)
A condition which occurs when the data output of a reader
or interface controller does not agree with the data encoded
within a bar code symbol.
MSI Plessey
A numeric-only bar code type. It can accept a variable num-
ber of digits up to 13. MSI Plessey consists of four bars and
four adjacent spaces. Each bar\space pair consists of one
information bit. A zero bit consists of a narrow bar followed
by a wide space, while one bit consist of a wide bar followed
by a narrow bar. The zero bit is one unit bar followed by a
two-unit space and the one bit is a two-unit bar followed by
a one unit space. The primary application for the MSI Ples-
sey code is marking of retail shelves and subsequent scan-
ning with portable devices for inventory purposes.
1-8
SE 1223 Scanner User's Guide
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