Allen-Bradley 2755 User Manual download pdf (Page 83)

Glossary G–5

element width

The thickness of an element measured from the edge closest to the

symbol start character to the trailing edge of the same element.

encoded area

The total linear dimension consisting of all the characters of a code

pattern, including start and stop characters and data.

error

A discrepancy between a computed, observed or measured value or

condition and the true, specified or theoretically correct value or

condition.

fault

Any malfunction that interferes with normal system operation.

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.

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.

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Allen-Bradley 2755 User Manual Page 83