Chapter
6
Operating Instructions
CLV 490 Bar Code Scanner
6-22
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8 008 796/0000/25-06-2002
Operation
Triggering the reading pulse via the Terminal Emulator
In the default setting the "Sensor" switching input is the (external) trigger source of the rea-
ding pulse. The reading pulse can also be triggered directly via the Terminal Emulator of CLV-
Setup for test purposes. To do so, a different trigger source must be selected temporarily
in the CLV.
1.
Choose D
EVICE
C
ONFIGURATION
tab.
2.
In the R
EADING
T
RIGGER
M
ODE
section click the S
ERIAL
I
NTERFACE
option.
3.
Perform a download to the CLV by clicking
in the toolbar.
The D
OWNLOAD
P
ARAMETERS
dialog box is then displayed.
4.
Confirm the dialog box by choosing the T
EMPORARY
storage option.
The serial interface has been activated as the trigger source of the reading pulse and
is ready to receive appropriate commands.
5.
Click
in the toolbar.
The Terminal Emulator window is then displayed.
The CLV is in the Reading mode.
6.
Click the SW-T
RIGGER
O
N
button or press [F7].
CLV-Setup sends a start command to the CLV.
The "Sensor" LED lights up and the scan line appears.
7.
Present the bar code pattern from
to the CLV.
8.
Click the SW-T
RIGGER
O
FF
button or press [F8].
CLV-Setup sends a stop command to the CLV. The "Sensor" LED is extinguished. The
CLV switches off the laser diode. The CLV displays the reading result in the output win-
dow of the Terminal Emulator. The "Read Result" LED lights up for a duration of 100 ms
(default setting).
6.5.2
Percentage evaluation
In the Percentage evaluation mode, the quality of the reading function is assessed (no con-
veyor movement).
The CLV performs 100 scans in the free running mode and evaluates the reading quality. It
outputs the reading result continuously every 2 s via the terminal interface. The reading re-
sults can be displayed in the Terminal Emulator of CLV-Setup. The standard decoder has to
be set temporarily for the percentage evaluation.
The Percentage evaluation mode can be called up by choosing V
IEW
in the menu bar, as a
device function via CLV 490 (interactively), or via the Terminal Emulator.
Line scanner with oscillating mirror:
In the Percent Evaluation mode, the CLV behaves in the following manner:
–
in "Oscillating" mode (basic setting: oscillating with a fixed amplitude), the CLV shuts off
oscillation and positions the scan line under the angle CW = 50 (corresponds to a
deflection angle below 105
°
). This position cannot be altered.
–
in "One-Shot" mode, the CLV positions the scan line under the angle CW = 50 as well.
–
in ”Fixed position” mode, however the scan line’s selected position remains unchanged.