Chapter
10
Operating Instructions
CLV490 Bar Code Scanner
10-90
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8009993/RA61/2007-07-20
Appendix
No Read format
Special, parameterizable data block as a substitute for bar codes, which were expected but
not detected, in the data output string on the host interface for
Ö
No Read. Comprises a
variable combination of the error string and the
Ö
"Code-Info/Separator" block.
Object polling
The CLV490 automatically detects a current object entering or leaving the reading field wit-
hout any external sensors.
Omnidirectional reading
Arrangement of the scan lines of at least two CLVs which form a cross. Due to the max. tilt
45
°
of the CLV490 the position of a bar code to the scan lines is free.
One-Shot
Selective, one-off deflection of the oscillating mirror for each
Ö
reading pulse. Usually com-
prises a slow forward phase (read) and a fast return phase (return to starting position).
Oscillating mirror reversal point
Deflection point of the oscillating mirror at which it changes direction. Can be used to trigger
a
Ö
focus position switchover for slower applications (search mode).
Parameter set
Data record used to initialize and activate the functions implemented in the CLV490. With
Ö
downloading and
Ö
uploading the parameter set is transferred form CLV-Setup to the
CLV490 or from the CLV490 to CLV-Setup.
Parameter memory, external
Optional accessory containing an integrated connector cover. Enables devices to be conve-
niently replaced by storing a copy of the CLV490 parameter set (EEPROM). The replace-
ment device then accesses this parameter set directly and does not have to be configured
manually.
Percentage evaluation
Special operating mode in which the quality of the reads (not those of the bar codes, how-
ever) is assessed statistically. The bar codes must be stationary. The CLV490 carries out
100 scans and evaluates the reading quality. It then outputs the reading results on the
Ö
auxiliary interface every 2 s together with the
Ö
reading diagnosis data.
Plain text
Legible form of a CLV490 message. The CLV490 outputs special messages in coded form,
e. g. the result of the self-test is represented as three digits.
Reading angle (RA value)
Position of the first dark bar in a detected bar code along the
Ö
scan line. Calculated by the
CLV490 for each scan and can be used, for example, to separate bar codes with identical
data contents. The active evaluation range in the scan line can be restricted for
Ö
decoding
purposes by specifying the maximum and minimum reading angle value for the application.
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