Opticon XPT 3125 Universal menubook - Manual (Page 141)

OPTICON Universal menu book
U134
IEEE 802.15.4:
A wireless transmission protocol that uses
radio frequency waves.
Intensity:
The amount of radiant or luminous flux per unit
solid angle that is diverging from a light source.
Inter character delay:
The time between transmitting two characters.
Interface:
Allows devices to communicate with each
other. Used most often to refer to the design of
hardware and software which allows
connection of network components and transfer
of information.
ISO:
An acronym for International Organization for
Standardization. This is referring to an
organization, which is an authority for
international standards.
Keyboard wedge:
This device permits you to connect a bar code
reader between the computer and it's keyboard
by way of an Y-cable. The computer "suggests"
that the scanned data is keyboard entered.
Normal software can still be used.
Laser reader:
A scanning device which utilises a laser diode
for it's source of illumination. Laser is an
acronym for Light Amplification by Stimulated
Emission of Radiation. A physical process
which after focusing leads a light beam with
special properties. A laser beam can be very
powerful. For bar code scanning a low energy,
safe laser beam is used.
Parity:
A method of checking for errors in transmitted
data. The eight bits of each transmitted
character are added, and the total must always
be an odd number for odd parity and an even
number for even parity. If the total is wrong, the
communications software detects that an error
has occured during transmission and may
request that the data is retransmitted.
Preamble:
Also known as common prefix. This is one or
more characters, which accompany the
transported data. The preamble is put in front of
the code specific prefix and the bar code data
itself.
Prefix:
One or more characters which accompany
transported data. A prefix is put in front of the
data and is part of the frame.
Postamble:
Also known as common suffix. This is one or
more characters, which accompany the
transported data. The postamble is transmitted
at the end of the data, right after the code
specific suffix.
Protocol:
Usually, a specified method for determining
how and when to format and send data. A
serial (asynchronous) transmission protocol
might include the baudrate, handshake method
(XON/XOFF, etc.), parity setting, number of
data bits (character length), and number of stop
bits.
Resolution:
In optics, sharpness; the ability of a reader to
read the narrow bars in bar codes.