Chapter
4
Operating Instructions
CLV490 Bar Code Scanner
4-8
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8009993/RA61/2007-07-20
Installation
4.3.2
Adjusting the CLV490
The CLV490 can be adjusted in Percentage Evaluation mode. In this mode, the CLV490 dis-
plays the quality of the bar code reads that enter the CLV490 reading field statically (the
object is not moved on the conveyor belt). The CLV490 performs 100 scans and evaluates
the reading quality statistically. It then outputs the reading results every 2 s on the auxiliary
interface.
Note
In default setting, the CLV490 operates in the autofocus mode "Minimum distance“. As a
result, the CLV490 focuses on the object that is nearest in Percentage Evaluation mode.
The view on the object with the scan line must be unobstructed, i. e. any other objects must
not protude into the autofocus space. If they do so, the autofocus mode "Differential back-
ground“ must be selected. Alternatively a fixed focus position can be set. See
Parameterizing focus control, Page 6-12
The behavior of the "Read Result" LED also indicates the reading quality:
–
The LED is extinguished if reading quality is < 30 %
–
The LED flashes twice per second if the reading quality is 30 % to 70 %
–
The LED flashes five times per second if the reading quality is 70 % to 90 %
–
The LED is lit continuously if the reading quality is > 90 %
The scanning frequency in the default setting is 800 Hz.
1.
Connect the CLV490 to the CDB420 or CDM490 Connection Module and switch on
the power supply (see
Chapter 5.5.3 Connecting the supply voltage, Page 5-18
After it has started, the CLV490 confirms that the self-test was successfuly and switch-
es to reading mode ("Device Ready" LED lights up).
2.
Connect the PC to the auxiliary interface of CLV490. To do so, connect a 3-core RS 232
data cable (null modem cable) to the internal 9-pin "Aux" plug of the CDB420 or
CDM490 (see
Chapter 5.5.6 Connecting the PC, Page 5-21
3.
Start Windows and the "CLV-Setup" program (see
Chapter 10.6.3 Starting CLV-Setup,
).
Choosing the standard decoder:
4.
Choose the C
ODE
C
ONFIGURATION
tab.
5.
Click the S
TANDARD
option in the D
ECODER
section.
6.
Download the settings to the CLV490.
To do so, click the S
TANDARD
option again with the right mouse button and choose
D
OWNLOAD
P
ARAMETER
in the context menu.
CLV-Setup copies the parameter to the CLV490 temporarily.
The CLV490 then operates with the standard decoder (until the CLV490 is switched
off).
Activating Percentage Evaluation mode:
7.
From the V
IEW
menu, choose P
ERCENTAGE
E
VALUATION
.
The dialog box for entering the distance configuration appears.
8.
Click the relevant distance configuration for the reading distance:
– with autofocus mode the distance configuration no. 1
– with event-controlled dynamic focus control the distance configuration that matches
the reading distance of the object (default: no. 1, focus position F = 1,200 mm
(47.3 in)).
9.
Confirm the dialog box with OK.
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