Microscan MS-890, User Manual, Page: 207 / 308

MS-890 Industrial Automation Scanner User Manual
10-5
Raster/Laser
Bottom Offset
Note: For single scan line operation, set Top Offset equal to Bottom Offset or click on
the Static Line option.
Note: Assigning a larger value to Top Offset than Bottom Offset will park the raster
mirror in its “home” (default) position.
Raster Sweep Rate
Definition:
Increasing the Bottom Offset value causes the bottom of the raster pattern
to move down.
Serial Cmd: <
K506,
raster status,top offset,
bottom offset
,raster sweep rate,read cycle
on/off>
Default: 127
Options: 0 to 255
Usage: If your application allows it, a slower sweep rate can produce more scans
per second and higher read rates. To determine the minimum read rate for
your application, see Raster Picket Fence Calculation on page A-28.
Definition: The raster sweep rate is the number of sweeps per second the raster
mirror completes. A sweep is one pass of the raster, up or down. The
maximum sweep rate is limited by the size of the arc the raster must move
through.
Serial Cmd: < K506, raster status,top offset,bottom offset, raster sweep rate ,read cycle
on/off>
Default: 10
Options: 0 to 30.
The table below shows the maximum speeds at selected raster sweep
arcs. To maximize the number of scans per symbol, use the lowest effective
sweep rate required for the application.
Raster Sweep Arc Maximum Sweeps per Second
0 to 10° 30
11 to 20° 20
21 to 36° 10