Rockwell Automation 2755 AdaptaScan Software - Manual (Page 76)

5–2
Publication 2755-838
The Reader performs both linear and raster scanning.
Linear Raster (with flyback)
The orientation of the Reader to the labels usually determines the
type of scanning required.
Picket Fence Orientation Step Ladder Orientation
Reader Mounted
Above Conveyor
Reader Mounted
On Side of Conveyor
Reader Mounted
Above Conveyor
Reader Mounted
On Side of Conveyor
When the labels pass the scanner in a step ladder orienta-
tion, a linear scan is preferred. The beam scans the label as
it passes. The number of scans per label depends on the
label size, scan rate, and the conveyor speed. If a linear scanning Reader is aligned parallel with the long axis of
a picket fence label, the same strip of label is scanned repeatedly.
Because of this, picket fence applications usually use a raster
scan.
Scan Patterns