Rockwell Automation 2755 AdaptaScan Software - Manual (Page 214)

G–9
Publication 2755-838
Q
quiet zone
Spaces preceding the start character of a symbol and following the
stop character. Sometimes called the clear area.
R
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.
S
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.
scan count
The number of scans decoded within a decoder trigger period (up to
99).