Chapter
4
Operating Instructions
CLV 490 Bar Code Scanner
4-8
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8 008 796/0000/25-06-2002
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 mo-
ved 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.
The behavior of the "Read Result" LED also indicates the reading quality:
–
The LED does not light up if the CLV cannot read the bar code (reading quality < 30 %).
–
If the CLV is having problems reading the bar code (reading quality 30 % ... 90 %), the
LED blinks.
–
The CLV is aligned optimally when the LED lights up constantly (reading quality > 90 %).
The scanning frequency in the default setting is 800 Hz.
1.
Connect the CLV to the AMV/S 60 Connection Module and switch on the power supply
(see
Chapter 5.5.3 Connecting the supply voltage, Page 5-13
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 via the RS 232 line using the internal
9-pin "Service" plug of the AMV/S 60 (see
Chapter 5.5.5 Connecting the CAN interface,
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 by clicking
on the toolbar.
The D
OWNLOAD
P
ARAMETERS
dialog box is then displayed.
7.
Confirm the dialog box by choosing T
EMPORARY
.
The CLV then operates with the standard decoder.
Activating Percentage Evaluation mode:
8.
From the V
IEW
menu, choose P
ERCENTAGE
E
VALUATION
.
The dialog box for entering the distance configuration appears.
9.
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).
10. 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 6-22
Monitor the
reading quality (%)
during each of the subsequent steps!
Line scanner with oscillating mirror:
In the "Percent Evaluation" mode, the CLV behaves in the following manner:
– in "Oscillating" mode (default setting: oscillating with a fixed amplitude), the CLV shuts
off oscillation and positions the scan line under the angle CW = 50 (corresponds to
an angle of deflection of 105
°
). This position cannot be altered.
– in "One-Shot" mode, the CLV also positions the scan line under the angle CW = 50
– in "Set Position" mode, the scan line’s selected position remains unchanged.