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Chapter
4
Operating Instructions
CLV490 Bar Code Scanner
4-6
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8009993/RA61/2007-07-20
Installation
Note
In oscillating mode with variable amplitude, the scan line must always sweep the neutral
position (CW = 50). This means that oscillation is not possible in the range 60 CW to 80 CW,
for example, but is possible in the range 40 CW to 80 CW.
4.2.8
Count direction of the reading angle RA and code angle CW
Explanation
The CLV490 can scan and decode several bar codes with each read. In doing so, it deter-
mines the specific local reading diagnosis data for each bar code:
•
The reading angle (RA value) of the center of the bar code within the scan line
•
(Scanning method using the oscillating mirror) also the angle of deflection of the scan
line (CW value) at which the center of the bar code is recorded
shows the count direction of the reading angle and code angle. In the case of the
line scanner, the count direction of the reading angle is marked by a small triangle above
the reading window.
By determining this data, the device can separate identical bar codes.
Tip
In the default setting, the CLV490 does not output the "RA" and "CW" values (line scanner
with oscillating mirror only) in the reading result on the host interface. If this is required to
evaluate the result in the host, the values can be included in the "Code-Info/Separator"
block of the output string using the "CLV-Setup" program.
Fig. 4-8:
Count direction of the reading angle RA in the scan line and of the code angle CW for the
oscillating mirror
90
CW
10
100
RA
0
Line scanner
Line scanner with
oscillating mirror
Mark: count direction
of the reading angle
Aperture angle
α
(opening angle) in the scanning direction: 1
°
= 1.5 RA (56
°
= 90 RA)
Deflection angle of the scan line crosswise to the scanning direction: 1
°
= 2 CW (20
°
= 40 CW)
100
RA
0
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