Microscan MS-860 User Manual page 91

Trigger
External Level
Usage: This mode is effective in an application where the speeds of the convey-
ing apparatus are variable and the time the reader spends scanning each
object is not predictable. It also allows the user to determine if a noread
has occurred.
1
Object
detector
Object
detector
Definition: External Level allows the read cycle to begin when a trigger (change of
state) from an external sensing device is received. The read cycle
endures until the object moves out of the sensor range and the active
trigger state changes again.
Serial Cmd: <K200,2>
Important: Level and Edge apply to the active logic state (Open or Closed) that
exists while the object is in a read cycle, between the rising edge and falling edge. Ris-
ing 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.
7-8
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Initiate Read Cycle:
Object # 1, moving in front of
the detector beam, causes a
change in the trigger state, initi-
ating the read cycle.
End Read Cycle:
The same object, moving
out of the detector beam,
1
causes another change in
the trigger state, ending
the read cycle.
External Level Trigger
MS-860 Industrial Raster Reader User's Manual
Active
0
Associated waveforms
assume External Trigger
State is set to Active
Closed.
Active
0