Allen-Bradley 2755 Manual de usuario descargar pdf (Pagina 87)

Glossary G–9

quiet zone

Spaces preceding the start character of a symbol and following the

stop character. Sometimes called the clear area.

read

A condition in which an entire package is decoded.

reader

A device comprised of a scanner and a decoder.

RS-232C

An EIA standard that specifies electrical, mechanical, and functional

characteristics for serial binary communication circuits in a

point-to-point link.

RS-422

An EIA standard that specifies electrical characteristics of

balanced-voltage digital interface circuits in a point-to-point link.

RS-485

An EIA standard that specified electrical characteristics of

balanced-voltage digital interface circuits in a multi-point link.

scan

The search for a symbol or marks which are to be optically

recognized.

scan area

The area intended to contain a bar code symbol.

scanner

An electronic device to acquire and convert reflected light from the

bars and spaces of a symbol into electrical signals for processing by

the decoder.

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Allen-Bradley 2755 Manual de usuario Pagina 87