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Accu-Sort Systems
Error
A discrepancy between a computed, observed or measured value or condition and the true, specified or theoretically
correct value or condition.
ETX (End of Text)
A transmission control character that terminates a text.
Even Parity
A data verification method in which each character must have an even number of on bits.
Expansion Bus
Allows the microprocessor to communicate with controllers for peripheral devices, such as a network card or an internal modem.
Far Distance
The distance (in inches) from the face of the scanner to the farthest point at which a code can be successfully scanned.
Flying Lead
A lead that exits the back of the connector hood on the outside of the cable jacket. It is normally attached to the drain wire or
shield and connected to the chassis of the switch, modem, etc. It can also be a hardware control lead.
Front Read
The scanner is mounted to read bar codes on the leading edge of a box as it passes the scanner. In a front read application, the
scanner can be mounted above or on the side of the conveyor.
Full Duplex (FDX)
Simultaneous, two-way, independent transmission in both directions.
Guard bars
1) The bars at the ends and center of a UPC and EAN symbol that ensure a complete scan of the bar code. 2) The
optional bars outside the quiet zone of an Interleaved 2 of 5 symbol that ensure a complete scan of the bar code.
Half Duplex (HDX)
Transmission in either direction, but not simultaneous.
Handshaking
Exchange of predetermined signals between two devices establishing a connection. Usually part of a communications protocol.
Height of Scan
The maximum vertical scanning dimension of a moving beam scanner at a specific distance from the face of the scanner.
Helium Neon Laser
A type of laser commonly used in bar code scanning. Because the laser beam is bright red, bars must not be printed with red ink
since they would be indistinguishable from the code’s background.
Hexadecimal
A base-16 numbering system that uses the symbols 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F.
Host
1) A central controlling computer in a network system. 2) Any device on a network system that provides a
controlling function to another device on the network. 3) Any intelligent device for which another device is
providing a communication interface to a network.
Ink Jet Printing
Ink jet is a non-contact printer that projects drops of ink at a printing surface. The sprayed drops are controlled electronically to
form a bar code.
Common Problems with ink jet printing
Its main restriction is that ink jet printing is usually capable of printing only low density codes.
Benefits of ink jet printing
Because ink-jet printers are non-contact and non-impact, they can print bar codes on a variety of contoured, rough, and delicate
surfaces. Capable of printing random or sequential information on labels. Ink jet printers can print directly on cartons and avoid
the cost of label stock.
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