Operating Instructions
Chapter
10
CLV490 Bar Code Scanner
8009993/RA61/2007-07-20
©
SICK AG · Division Auto Ident · Germany · All rights reserved
10-91
Appendix
Reading diagnosis data
Data directly derived from the reading procedure by the CLV490. This data enables the
quality of the read to be assessed. The data is always output on the
Ö
auxiliary interface
together with the reading result. Only output on the host interface if enabled on the D
ATA
S
TRING
tab in the "CLV-Setup" program (for the CLV490 disabled by default).
Reading field
In start/stop mode the reading field is the area between the start and stopp sensors for the
reading pulse in conveyor direction. In tracking mode the reading field is the area between
the sensor for start/end of an object and the object release point (data output) (parameter-
ized as a distance in conveyor direction), referred to the increments.
Reading field height
Length of the
Ö
scan line that is available for detecting the bar code in the reading plane.
Due to the V-principle of beam generation, the reading field height is dependent on the
reading distance.
Reading interval
Timeslot in which the CLV490 activates the laser diode and attempts to detect valid bar
codes from the information read. The reading interval may be shorter than the external read-
ing pulse, depending on the selected output mode for the reading result.
Reading pulse
Clock pulse applied externally to the CLV490 to trigger the internal
Ö
reading interval. Can
be supplied by a photoelectric reflex switch or a command from the host on the serial inter-
face.
Reading range (DOF)
Depth of field about the focal point of the laser beam on two sides. The extent of the reading
range depends on the resolution and reading distance.
Reading result
Electronic representation of the data content of the read bar code together with the
Ö
read-
ing diagnosis data in one
Ö
data output string that is generated after the reading pulse has
elapsed. The reading result on the auxiliary interface has a fixed format (content and output
format); the reading result on the host interface can be configured separately for Good
Reads and No Reads. Special characters can also be added if necessary.
Result status output
Function of the four "Result 1" to "Result 4" switching outputs in Reading mode. Signals the
status of the reading result without indicating its contents (e. g. Good Read). You can assign
a status to each output on the D
EVICE
F
UNCTION
tab in CLV490. The "Read Result" LED is
linked to the "Result 2" output.
Scan line
See line scanner.
Sending point
Point at which the reading result is output with respect to the start of the
Ö
reading pulse
and the internal
Ö
reading interval.
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