Rockwell Automation 2755 Undecoded Hand-Held Scanner - Manual (Page 9)

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Publication 2755-6.1
Scanner Features
The scanners use a low power visible (red) laser diode for scanning. The
trigger turns on the laser which scans a label at approximately 36 scans
per second.
Trigger
Cable Connector
LEDs
The laser beam:
-exits through the scan window
-reflects off the label back through the window
-is detected by a sensor in the scanner
When a label is read, the laser beam is automatically turned off until the
trigger is pressed again. If no label is read, the laser beam automatically
turns off after approximately 3 seconds and remains off until the trigger
is released and pressed again.
Note: The Extended Range Scanner (Catalog No. 2755-HUG-9) has a
two position trigger. The first detent provides a spotter beam and the
second position provides a scan line.