Operating Instructions Chapter 11
CLV640 Bar Code Scanner
Appendix
8011975/0000/2008-04-14 © SICK AG · Division Auto Ident · Germany · All rights reserved 125
Focus position
Distance of the lens focal point in front of the reading window. The distance determines the
DOF (depth of field) via the bar code scanner’s lenses, in which the code can be analysed.
Focus position switching
The capability of the bar code scanner to shift the focus of the laser beam within a wide
range on the reading level. Focus position switching is event-driven (e.g. through distance
detection).
Function interfaces
Digital switching inputs and outputs of the bar code scanner.
Good read
The defined evaluation condition(s) were successfully met during the last reading pulse in
the reading process.
Host interface
Logical main data interface of the bar code scanner with two independent, configurable
data output formats. Allows, among other functions, the output of the reading result in tel-
egram form to the host/PLC. Physically switchable to RS-232/RS-422/485 and Ethernet
(port 2112) or CAN. Works as a gateway in conjunction with the SICK-specific CAN-SENSOR
network. Provides various transfer protocols (except for CAN).
With the Host interface, access to the bar code scanner for configuration and diagnosis is
always possible with the SOPAS-ET configuration software. The data transfer rate is 57.6
kbd in the default setting. The data output via RS-232/RS-422/485 can be switched off,
existing Host interface data output via Ethernet remains active. However, it can be eliminat-
ed separately.
Line scanner
Scanner that uses a polygon mirror wheel with paraxial mirrors to deflect a focused laser
beam extremely fast. As a result, it creates a light spot in the reading plane that moves along
a straight line, which appears to the naked eye as a stationary scan line.
Line scanner with oscillating mirror
Line scanner that also deflects the laser beam about a central position, on both sides and
perpendicular to the san direction using an oscillating mirror. By doing so, the bar code
scanner can search for bar codes in larger areas. In addition to basic deflection to the max-
imum oscillation amplitude, optimum oscillating mirror functions are also possible.
Master/Slave configuration
Special arrangement and technical circuit connection of several bar code scanners to one
reading station (e.g. multi-side reading) using the CAN interface. Via the master the combi-
nation acts on the host as just one device.
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