Microscan Quadrus Verifier, Руководство пользователя

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A-20
Quadrus Verifier User’s Manual
Object Detector
Appendix G — Object Detector
The Quadrus Verifier can be used as a fully functional reader in a wide variety of applications.
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 be interrupted by 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’s field of
view and is decoded.
Example of Object Detector Operation
Quadrus Verifier
Object and Symbol Object and Symbol
To Host
Object
Detector
Power
Supply
IB-150 Interface Kit