Glossary - 6
MC21XX Series User Guide
LED 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 composition.
Light Emitting Diode.
See
LED
.
M
MC.
MC21XX.
MIL.
1 mil = 1 thousandth of an inch.
MIN.
Mobile Identification Number. The unique account number associated with a cellular device. It is broadcast by the
cellular device when accessing the cellular system.
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.
MC21XX.
In this text, MC21XX refers to the Motorola wireless handheld computer. It can be set up to run as a
stand-alone device, or it can be set up to communicate with a network, using wireless radio technology.
N
Nominal.
The exact (or ideal) intended value for a specified parameter. Tolerances are specified as positive and
negative deviations from this value.
Nominal Size.
Standard size for a bar code symbol. Most UPC/EAN codes are used over a range of magnifications
(e.g., from 0.80 to 2.00 of nominal).
NVM.
Non-Volatile Memory.
P
Parameter.
A variable that can have different values assigned to it.
PDT.
Portable Data Terminal.
Percent Decode.
The average probability that a single scan of a bar code would result in a successful decode. In a
well-designed bar code scanning system, that probability should approach near 100%.
Q
Quiet Zone.
A clear space, containing no dark marks, which precedes the start character of a bar code symbol and
follows the stop character.
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