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Operating Instructions
Chapter
6
CLV490 Bar Code Scanner
8009993/RA61/2007-07-20
©
SICK AG · Division Auto Ident · Germany · All rights reserved
6-47
Operation
Proceed as follows to check the restricted evaluation range:
1.
Click
in the toolbar.
The Terminal Emulator window is then displayed. The CLV490 is in the Reading mode.
2.
In the D
EVICE
MODE
section, choose S
HOW
RA-
LIMITS
.
The dialog box for the distance configuration is then displayed.
3.
Click the distance configuration for which the active evaluation range of the scan line
has been restricted (DC-specific). The "Device Ready" LED is extinguished. The CLV490
cancels the Reading mode and blanks the red scan line alternately (as described
above) as of RA
min
and RA
max
.
4.
Check
Step 2 and 3
for each active distance configuration to determine whether the
bar code is in the center of the range between the end of the shorter scan line (RA
min
)
and the end of the longer scan line (RA
max
) or, if there are several bar codes, to
determine whether the center of the field of all the codes is within the range.
5.
If necessary, correct RA
min
and RA
max
accordingly. Perform a download to the CLV490!
6.
Choose R
EADING
M
ODE
to exit the Show RA-limits mode. The CLV490 returns to the
Reading mode and the ”Device Ready” LED lights up.
Note
In the Reading mode, the CLV490 does not actually blank the scan line visually, but instead
takes the values specified for the restricted evaluation range into account when the data
contents are decoded.
6.5.6
Background Analysis
In this mode, CLV-Setup shows online how the CLV490 interprets the object distance
measurement of its visual range. This function provides information on the gradient of the
current detected background (current distance profile), the background which was
corrected via parameterizing/Background Teach-in and the points in the distance profile
focused on by the CLV490. The object distance measurement must be activated for this
(default setting).
¾
Click
or choose CLV490, B
ACKGROUND
A
NALYSIS
in the menu bar.
The B
ACKGROUND
A
NALYSIS
dialog box is displayed and shows the values in the plot
diagram. The red line shows the current distance profile, the blue line shows the
corrected background.
Fig. 6-14:
CLV-Setup: Example of output in the "Background Analysis" dialog box
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