Operating Instructions
Chapter
10
CLX 490
8 009 237/0000/07-05-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
10-43
Appendix
Reading interval
Timeslot in which the CLX activates the laser diode and attempts to detect valid bar codes
from the information read. The reading interval may be shorter than the external reading
pulse, depending on the selected output mode for the reading result.
Reading pulse
Clock pulse applied externally to the CLX to trigger the internal
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reading interval. Can be
supplied by a photoelectric reflex switch or a command from the host on the serial inter-
face.
Reading range (DOF)
Depth of field about the focal point of the laser beam on two sides. The extent of the reading
range depends on the resolution and reading distance.
Reading result
Electronic representation of the data content of the read bar code together with the
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read-
ing diagnosis data in one
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data output string that is generated after the reading pulse has
elapsed. The reading result on the terminal interface has a fixed format (content and output
format); the reading result on the host interface can be configured separately for Good
Reads and No Reads. Special characters (control characters, alpha-numeric constants) can
also be added if necessary.
Result status output
Function of the four "Result 1" ... "Result 4" switching outputs in Reading mode. Signals the
status of the reading result without indicating its contents (e. g. Good Read). You can assign
a status to each output on the D
EVICE
F
UNCTION
tab in CLX. The "Read Result" LED is linked
to the "Result 2" output.
Scan line
See Compact OMNI Scanner.
Sending point
Point at which the reading result is output with respect to the start of the
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reading pulse
and the internal
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reading interval.
Separator
Data block in the reading result on the
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host interface. Used to separate the data content
of the bar codes. Can be attached to the bar code as a prefix or suffix. Contains reading
diagnosis data, control characters and alpha-numeric constants, depending on the configu-
ration. The error status ST is output in the separator by default.
SICK network
Special, high performance network of max. 31 CLX with high data transfer rates on the
RS 485 interface. The CLX are coordinated (polling) and connected to the host via the
CLX 200 Network Controller.
SMART decoder
Specially developed
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decoder for reading bar codes with an extremely small code height
and for poor-quality or contaminated code prints.
