Datalogic 942500001, User Manual

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Glossary
User’s Manual 245
LAN
Local area network. A radio network that supports data
communication within a local area, such as within a warehouse of
building.
Laser
Light Amplification by Stimulated Emission of Radiation.The laser is
an intense light source. Light from a laser is all the same frequency,
unlike the output of an incandescent bulb. Laser light is typically
coherent and has a high energy density.
Light Emitting Diode (LED)
A low power electronic light source commonly used as an indicator
light. It uses less power than an incandescent light bulb but more
than a Liquid Crystal Display (LCD).
Liquid Crystal Display (LCD)
A display that uses liquid crystal sealed between two glass plates.
The crystals are excited by precise electrical charges, causing them
to reflect light outside according to their bias. They use little
electricity and react relatively quickly. They require external light to
reflect their information to the user.
MIL
1 mil = 1 thousandth of an inch.
Null Modem Cable
RS-232 serial cable where the transmit and receive lines are
crosslinked. In some cables there are also handshake lines
crosslinked. In many situations a straight through serial cable is
used, together with a null modem adapter. The adapter contains the
necessary crosslinks between the signals.