Chapter
3
Operating Instructions
CLV490 Bar Code Scanner
3-6
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8009993/RA61/2007-07-20
Product description
3.2
Method of operation
The CLV490 first scans the bar code with a scan line and then decodes it. In stand-alone
configuration, the data is forwarded via the serial host interface (main data interface) to a
host/PC for further processing, or via the CAN interface to the OTS400 Omni Tracking Sys-
tem. An overview of the CLV490 functions is provided in
.
The CLV490 is equipped with two decoders:
•
The SMART decoder (
S
ICK
M
odular
A
dvanced
R
ecognition
T
echnology) for decoding
bar codes with small code height, bar codes that are dirty or damaged, as well as bar
codes that are tilted excessively (azimuth angle)
•
The tried-and-tested standard decoder of the CLV series
The CLV490 derives useful diagnosis data from the reading process and can transfer it to
also the host. It also records operating data that can be interrogated at any time. The quality
of the read can be checked in percentage evaluation mode.
To start the reading process when an object is located in the reading field, the CLV490 re-
quires a suitable trigger. This opens an internal time window ("reading interval") in the
CLV490. In the default configuration, this trigger is supplied by an external reading pulse
sensor. Alternative trigger sources include Free-running mode or a command via the host
interface (for more complex applications: object polling or OTS trigger).
The current operating status is indicated by four LEDs.
If the trigger is supplied externally, the "Sensor" switching input instructs the CLV490 to start
the reading process. The five "IN 0" to "IN 4" switching inputs switch the focus position in
response to certain events, as an alternative to the autofocus function. The "IN 3" and
"IN 4” inputs can also be assigned special functions. The four "Result 1" to "Result 4"
switching outputs can be assigned to different functions for displaying the result status and
also control external devices, such as a PLC.
The CLV490 is operated and configured via the serial auxiliary interface (auxiliary interface)
using the "CLV-Setup" software or via the host interface/auxiliary interface using command
strings.
Fig. 3-2:
Block diagram: CLV490 functions
Photoelectric
switch
Reading pulse
Signal
*)
Focal control
Trigger One-Shot
Conveyer increment
End of reading
interval
*) if required
PC
Operation
Parameterization,
etc.
HOST
Further processing
of the reading result
CAN bus
Status display
e. g. Device Ready
e. g. Good Read
e. g. No Read
e. g. Match 1
CLV490
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