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Quadrus EZ Reader User’s Manual
Object Detector
Appendix L — Object Detector
In a typical operation, a reader will wait for symbol data only during a triggered read cycle.
A read cycle is initiated by a “trigger” and can be in the form of a serial command from the
host (internal trigger) or a signal from an object detector (external trigger).
When an object detector (also called a sensor, package detector, etc.) is used, it is set up
so that its beam will bounce off the approaching object and the resulting pulse will be sent
to the reader to begin the read cycle. Typically, a detector is positioned so that it will detect
the presence of an object before its symbol can be read.
An object detector is mounted in almost any position relative to the object as long as (1)
the object passes within range of the detector and (2) direct or reflected light from the
detector does not interfere with the reader’s reception.
As the item continues to move down the line, its symbol moves into the reader beam and
is read by the reader.
Object Detector Operation