Chapter
4
Operating Instructions
CLV 490 Bar Code Scanner
4-8
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8 009 993/O824/20-12-2004
Installation
4.3.2
Adjusting the CLV
The CLV can be adjusted in Percentage Evaluation mode. In this mode, the CLV displays the
quality of the bar code reads that enter the CLV reading field statically (the object is not
moved on the conveyor belt). The CLV performs 100 scans and evaluates the reading
quality statistically. It then outputs the reading results every 2 s on the terminal interface.
Note
In default setting, the CLV operates in the autofocus mode "Minimum distance“. As a result,
the CLV 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 background“ must
be selected. Alternatively a fixed focus position can be set. See
.
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 CLV to the CDB 420 or CDM 490 Connection Module and switch on the
power supply (see
Chapter 5.5.3 Connecting the supply voltage, Page 5-19
).
After it has started, the CLV confirms that the self-test was successfuly and switches to
reading mode ("Device Ready" LED lights up).
2.
Connect the PC to the terminal interface of CLV. To do so, connect a 3-core RS 232
data cable (null modem cable) to the internal 9-pin "Aux" plug of the CDB 420 or
CDM 490 (see
Chapter 5.5.6 Connecting the PC, Page 5-22
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 CLV.
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 CLV temporarily.
The CLV then operates with the standard decoder (until the CLV 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.
The Terminal Emulator is launched and displays the reading result continuously (see
Chapter 6.5.2 Percentage evaluation, Page 6-42
).