AB Quality Allen-Bradley 2755-SN3, Руководство пользователя

Страница: 83 / 96

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.
F
fault
Any malfunction that interferes with normal system operation.
G
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.
H
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.