Chapter
3
Operating Instructions
CLV 480 Bar Code Scanner
3-6
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8 010 080/O824/10-02-2005
Product description
3.2
Method of operation
The CLV first scans the bar code with a scan line and then decodes it. In stand-alone con-
figuration, 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 OTS 400 Omni Tracking System.
An overview of the CLV functions is provided in
.
The CLV 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 CLV 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 CLV requires
a suitable trigger. This opens an internal time window ("reading interval") in the CLV. 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: OTS trigger).
The current operating status is indicated by four LEDs.
If the trigger is supplied externally, the "Sensor" switching input instructs the CLV 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 CLV is operated and configured via the serial terminal interface (auxiliary interface) using
the "CLV-Setup" software or via the host interface/terminal interface using command
strings.
System and error messages help you to configure the device and to locate the source of
errors during startup and reading mode.
Fig. 3-2:
Block diagram: CLV functions
Photoelectric
switch
Reading pulse
Signal
1)
Focal control
Trigger One-Shot
Conveyer increment
End of reading
interval
1) 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
CLV 480
