Chapter
11
Operating Instructions
CLV640 Bar Code Scanner
126
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8011975/0000/2008-04-14
Appendix
Multi-reading
Selectable number of readings which must each deliver internal results from one and the
same bar code before the bar code scanner generates the reading result.
No read
The defined evaluation condition(s) were not met during the last reading pulse in the read-
ing process.
No read format
Special, configurable output format for no reads in the data output string as a replacement
for the output formats of a reading with fulfilled evaluation conditions. In its default setting,
the bar code scanner displays the "NoRead" string as the no read format, framed by STX and
EXT.
Oscillating mirror reversal point
Point of deflection the oscillating mirror is at in which a reversal of direction takes place.
This point can be used to trigger the focus position switching for low-speed applications
(search function).
Parameter value set
Data set which is used to initialise and activate the implemented functions of the bar code
scanner. Transferred using the upload (all parameter values only) or download from the bar
code scanner SOPAS-ET configuration software or vice versa.
Pine tree effect
This effect of the line scanner with oscillating mirror is a result of the limits set by the active
scan line range and the oscillation amplitude (CW value). Hence a "sharp window" of the
same size can be generated in the reading field for every distance configuration for any read
distance.
Raster scanner
Scanner that uses a polygon mirror wheel with tilted mirrors to deflect its focused laser
beam extremely quickly. As a result, it creates a light spot that moves quickly in several rows
across the reading plane. Each light spot repeatedly moves along a straight line. It thereby
appears to human eyes as one of several stationary scan lines.
Reading angle (RA value)
The reading angle from the reading window to the red scanning line of the scanning beam
under which the middle of a bar code is detected. Recorded by the bar code scanner for
each scan and used, e. g., for the separation of bar codes with identical data contents. For
the decoding process, the active analysis area along the scanning line can be restricted ap-
plication- specifically by presetting the minimum and maximum RA values.
