Appendix H Object Detector - Microscan Quadrus MINI Imager User Manual

Object Detector
Appendix H — Object Detector
In a typical operation, an imager 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 imager 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 the
object passes within range of the detector and direct or reflected light from the detector
does not interfere with the imager's reception.
As the item continues to move down the line, its symbol moves into the imager beam and
is decoded.
Object and Symbol
Object Detector
A-26
Object and Symbol
Imager
Quadrus MINI Imager User's Manual