Worth Data 5000 TriCoder s Especificaciones descargar pdf (Pagina 10)

Bar Code Readers

There are three basic types of bar code readers: fixed, portable batch, and

portable RF. Fixed readers remain attached to their host computer or terminal

and transmit one data item at a time as the data is scanned. Portable batch

readers are battery operated and store data into memory for later batch transfer

to a host computer. Some advanced portable readers can operate in non-portable

mode too, often eliminating the need for a separate fixed reader. Portable RF

Readers are battery operated and transmit data real-time on-line. More

importantly, the real-time two-way communication allows the host to instruct

the operator what to do next based on what has just happened.

A basic bar code reader consists of a decoder and a scanner, (a cable is also

required to interface the decoder to the computer or terminal). The basic

operation of a scanner is to scan a bar code symbol and provide an electrical

output that corresponds to the bars and spaces of a bar code. A decoder is

usually a separate box which takes the digitized bar space patterns, decodes

them to the correct data, and transmits the data to the computer over wires or

wireless, immediately or on a batch basis.

USB Interface Bar Code Readers

A more recent interface available for bar code reading is the Universal Serial

Bus interface. Most new PC’s (with Windows 98, ME, 2000, and XP only –

neither Windows 95 nor NT offers USB support) and Macs come with several

USB ports available for peripheral attachment. Data transmitted by the bar code

reader to the USB port appears much like data coming from a keyboard wedge

reader; in fact, USB interface can be used to input data into the same

applications that would typically be used with a keyboard wedge reader.

Worth Data now offers integrated USB interface on all our keyboard wedge

readers; both integrated scanner models (LI50-WDP, LZ110-WDP and LZ210-

WDP) as well as those using a separate decoder (P22 WDP). Worth Data also

developed a USB interface adapter that allows an existing keyboard wedge

reader to attach to the USB port. The Wedge Saver™ helps the user avoid

buying new readers simply for USB interface (some new PC’s don’t have

keyboard ports; they only have USB).

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Worth Data 5000 TriCoder s Especificaciones Pagina 10