Operating Instructions
Chapter
3
CLV 45x Bar Code Scanner
Product description
8 009 139/K949/06-06-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
3-5
3.2
Working method of the device
The CLV detects bar codes by means of a scan line and decodes them. The CLV transmits
the data via the main data interface (serial host interface) to a host/PC for further process-
ing.
The CLV provides two decoders for decoding:
•
The SMART decoder (
S
ICK
M
odular
A
dvanced
R
ecognition
T
echnology) for decoding
bar codes with a small "aspect ratio" (ratio of the code height to the code length), for
bar codes with damaged or soiled printing image as well as for reading bar codes under
a strong tilt (azimuth angle)
•
The proven standard decoder of the CLV series
The CLV derives useful data for diagnostics from the reading processes, which can also be
transferred to the host. In addition it carries retrievable operating data. The quality of the
reading can be checked in the "Percentage evaluation" operating mode.
The CLV requires suitable triggering in order to start a reading process when there is an
object in the reading area. This results in a time window ("reading interval") for the reading
process being opened in the CLV. In the default setting triggering is carried out by means of
an external reading pulse sensor. Alternative trigger sources are free-running operation or a
command via the host interface.
Four LED status displays inform optically on the current operating state.
A beeper (buzzer) signals the status of the read result acoustically. In the default setting the
Good Read function is selected to this purpose.
In the case of external triggering by a sensor the "Sensor 1" switching input signals the CLV
when it is to start a reading. The "Sensor 2" switching input is used to change over the focal
position. It can be used alternatively e. g. for the teach-in of a match code. The switching
outputs "Result 1" and "Result 2" can have various output functions of the result status as-
signed to them and control external devices, such as a PLC.
The CLV is operated and configured via the auxiliary data interface (serial terminal interface)
by means of the user interface of the "CLV-Setup" PC software or via the host interface/
terminal interface by means of command strings.
System, warning and error messages provide support in setting up and searching for errors
during starting up and reading operation.
Fig. 3-3:
Block diagram: Functions of the CLV
"Sensor 1"
"Sensor 2"
"Terminal"
"Host"
"Result 1"
"Result 2"
Photoelectric switch
Reading pulse
Signal
Focal position changeover
Teach-in match code 1,
etc.
PC
Operation
parameterization, etc.
HOST
Further processing
of the reading result
Status display
e. g. Good Read
e. g. No Read
