Microscan Quadrus Verifier, User Manual

Page: 188 / 470

6-10
Quadrus Verifier User’s Manual
Trigger
External Edge
Important: Level and Edge apply to the active logic state ( Active Off (I
OFF
) or Active On
(I
ON
)) that exists while the object is in a read cycle, between the rising edge and falling
edge. Rising edge is the trigger signal associated with the appearance of an object. Falling
edge is the trigger signal associated with the subsequent disappearance of the object.
Usage: This mode is highly recommended in any application where conveying
speed is constant or if spacing, object size, or timeouts are consistent.
Definition: External Trigger Edge , as with Level, allows the read cycle (active state) to
begin when a trigger (change of state) from an external sensing device is
received. However, the passing of an object out of sensor range does not end
the read cycle. The read cycle ends with a good read output or, depending on
End of Read Cycle setting, a timeout or new trigger occurs.
Serial Cmd: < K200,3 >
Trigger Edge
Initiate Read Cycle:
Object # 1, moving in front of the detector
beam, causes a change in the trigger state,
initiating the read cycle.
Initiate Second Read Cycle:
Object # 2, moving in front of the detector
beam, causes another change in the trig-
ger state. This signal initiates a new read
cycle and ends the previous read cycle
unless Timeout is enabled and a good
read or timeout has not occurred.
Associated waveforms assume
External Trigger State is set to
Active On.