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Chapter
10
Operating Instructions
CLV490 Bar Code Scanner
10-86
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8009993/RA61/2007-07-20
Appendix
10.16 Glossary
For further terms, please refer to the
"CLV-Setup Help".
Adjusting mode
Special operating mode that enables the center of the scan line to be positioned exactly on
the object containing the bar code.
Aperture angle
α
Angle within whose limits the laser beam is deflected by the polygon mirror wheel. A
V-shaped range perpendicular to the scan direction, which must contain the bar code, is
formed in front of the reading window. If only part of this aperture angle is used (part of the
scan line symmetric around the center point), the depth of field for the focus position and
resolution is greater.
Aspect ratio
Ratio code height (bar length) to code length (numer of characters). Using the SMART De-
coder even bar codes with very small code height can be read.
Autofocus function
Ability of the CLV490 to detect the distance of the objects without external sensors in order
to adapt the focus position to the object distance.
Auxiliary input
Special function on
Ö
the auxiliary interface. Used to enter bar code data subsequently in
order to complete reading results sent to the host.
Auxiliary interface
Auxiliary data interface (RS 232) on the CLV490 with fixed data output format. Used to con-
nect the "CLV-Setup" program to the CLV490 so that it can operate and configure the de-
vice. Also used to output system and error messages. Can be assigned various functions.
Capture range
Zone around a moving bar code created by the CLV490 using the increment management
and code position comparison functions. Enables bar codes with identical contents and
code type to be separated.
Christmas tree effect
Effect caused by limiting the active scan line range (reading angle values) and oscillating am-
plitude (CW values) on the
Ö
line scanner with oscillating mirror. In this way, a uniform sharp-
ly defined window can be created in the reading field for each distance configuration,
independent of the reading distance.
CLV-Setup
PC program that runs on Windows 95
TM
/98
TM
, Windows NT4.0
TM
, Windows 2000
TM
, Win-
dows XP
TM
and is used to parameterize the CLV490 offline (adjust the device to the local
conditions) and operate it online. The parameter set is exchanged with the CLV490 by
Ö
uploading and
Ö
downloading it.
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