Operating Instructions
Chapter
11
CLV640 Bar Code Scanner
Appendix
8011975/0000/2008-04-14
©
SICK AG · Division Auto Ident · Germany · All rights reserved
127
Reading diagnosis data
Code-, object- or device-related data which the bar code scanner derives directly from the
reading process. The data allows, among other things, an assessment of the reading quality
and to draw conclusions on the reading process.
Reading gate, reading interval
Time window in which the bar code scanner switches on the scanning line and attempts to
recognise valid bar codes from the read information. The reading gate can be shorter than
the external reading pulse, depending on the output mode of the selected reading result.
Reading pulse
Triggering of the internal reading gate via a bar code scanner-external pulse is carried out
by means of an external trigger source such as a photoelectric reflex switch or a command
string via the data interface. With internal trigger source "automatic tick", the bar code scan-
ner creates the reading pulse itself.
Reading range (DOF)
Depth of field at both sides of the lens focal point at the reading level. The size of the range
depends on resolution and reading distance.
Reading result
Electronic display and output of the data contents of the scanned bar codes together with
reading diagnosis data in a data output string at the defined output time.
Result status output
Adjustable function of the two independent switching outputs "Result 1" and "Result 2" of
the standard version. Indicates either the status of the reading result (e.g. good read) or the
fulfillment of a definable, event-dependent evaluation condition for the read operation
(such as Match1). The outputs can also be switched off individually or together. The Ether-
net version does not provide any switching outputs on its connectors. However, the function
with two switching inputs can be accessed via connection module CDB620 in combination
with the parameter memory module CMC600.
The "Result" LED is not coupled with one of the result outputs. It only shows status "Good
read" for approx. 100 ms when generating reading results via the data interface.
Saving to the bar code scanner
The application-specific parameter set can be stored in the bar code scanner either tempo-
rarily or permanently. In the case of temporary storage, the parameter set is only contained
in the temporary working memory (RAM) and is lost as soon as the power supply is switched
off. In the case of permanent storage, the parameter set is also transferred to the bar code
scanner’s permanent memory and saved as a current data set after switching off. The de-
fault setting is deposited in a fixed, Read Only Memory (ROM) irrespective of this.
Sending point
Output time of the reading result in relation to the start of the reading pulse and the fulfilled
evaluation conditions.
