Operating Instructions
Chapter
10
CLV 490 Bar Code Scanner
8 008 796/0000/25-06-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
10-83
Appendix
SMART decoder
Specially developed
Ö
decoder for reading bar codes with an extremely small code height
and for poor-quality or contaminated code prints.
Specification diagrams
Diagrams for reading the resolution-specific depth of field (DOF) for specific focus positions.
Standard decoder
Tried-and-tested
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decoder from the CLV product family. Suitable for applications with an
adequate code height, limited tilt, and high-quality code prints.
Storage in the CLV
The application-specific
Ö
parameter set can be stored temporarily or permanently in the
CLV. If it is stored temporarily in the RAM, it is lost as soon as the power supply is switched
off. Parameter sets that are stored permanently are transferred to the EEPROM in the CLV
and remain active as the current data record when the power supply is switched off. The
default setting is not affected by this and is stored in a read-only memory (ROM).
Switching sequence
Focus control function for event-controlled switching. Sequence of focus position settings
with associated depths of field. The numbers of the active
Ö
distance configurations are en-
tered at the required position in the assignment table for this purpose.
System messages
Messages
Ö
in plain text used to output the operating status of the CLV. The messages
are output on the terminal interface only and can be displayed in extended mode in the T
ER
-
MINAL
E
MULATOR
of the "CLV-Setup" program.
Teach-in
Method of programming the information required to adjust the CLV to the reading applicati-
on in Parameterization mode. Example: teaching in the background for the Autofocus
function, also known as a
Ö
distance profile.
Terminal interface
Auxiliary data interface (RS 232) on the CLV with fixed data output format. Used to connect
the "CLV-Setup" program to the CLV so that it can operate and configure the device. Also
used to output system and error messages. Can be assigned various functions.
Terminator
Data block in the reading result on the
Ö
host interface. Used to terminate the data content
of the bar code. Contains reading diagnosis data and/or constants (e. g. letters), depending
on the configuration. The control characters <CR> and <LF> are output in the terminator by
default.
Upload
Method of transferring the
Ö
parameter set from the CLV to the PC using the
Ö
"CLV-Setup"
program. CLV-Setup loads either a complete copy of the current parameter set from the
CLV’s memory (RAM)(U
PLOAD
TO
CLV) or just the recently edited parameter, using the right
mouse button’s context menus (U
PLOAD
P
ARAMETER
). Displays the current parameter values
on the tabs. Prerequisite for modifying the current parameter set.