Operating Instructions
Chapter
6
CLV 490 Bar Code Scanner
8 008 796/0000/25-06-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
6-27
Operation
Line scanner with oscillating mirror:
In "Show CP-limits" 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 below 105
°
). This position cannot be altered.
–
in "One-Shot" mode, the CLV positions the scan line under the angle CW = 50.
–
in "Fixed Position" mode, the scan line’s selected position remains unchanged.
The CLV blanks the scan line alternately as of the set value for CP
min
and as of the set value
for CP
max
shows an example of this. The switchover is made continuously at inter-
vals of 1 second. The part of the scan line that remains active for the reading procedure is
the section between CP
min
and CP
max
.
Example
:
Default setting: CP
min
= 5 to CP
max
= 95.
The CLV blanks the line as of CP
min
= 5 (short scan line) and as of CP
max
= 95 (long line).
Proceed as follows to check the restricted evaluation range:
1.
Click
in the toolbar.
The Terminal Emulator window is then displayed. The CLV is in the Reading mode.
2.
In the D
EVICE
MODE
section, choose S
HOW
CP-
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 CLV
cancels the Reading mode and blanks the scan line alternately (as described above) as
of CP
min
and CP
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 (CP
min
)
and the end of the longer scan line (CP
max
) or, if there are several bar codes, to deter-
mine whether the center of the field of all the codes is within the range.
5.
If necessary, correct CP
min
and CP
max
accordingly. Perform a download to the CLV!
6.
Choose R
EADING
M
ODE
to exit the Show CP-limits mode. The CLV returns to the Reading
mode and the ”Device Ready” LED lights up.
Note
In the Reading mode, the CLV 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.
Fig. 6-12:
Appearance of scan line in the "Show CP-limits" mode
CP
max
Active range
CP
min
Scan line 2
Scan line 1
Show CP limits