Read Cycle
MS-860 Industrial Raster Reader User’s Manual
7-9
External Edge
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.
Serial Data
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 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.
External Trigger Edge, as with Level, allows the read cycle 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 or with a
noread when a
No Decode Timeout occurs.
Serial Cmd:
<
K200,3
>
Usage:
Highly recommended in any application where conveying speed is con-
stant or if spacing, object size, or timeouts are consistent.
Definition:
In
Serial Data, the reader accepts an ASCII character from the host or
controlling device as a trigger to start a read cycle. A
Serial Data trigger
behaves the same as an
External Edge trigger.
Serial Cmd:
<
K200,4
>
2
Object
detector
1
Object
detector
0
Active
0
Active
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 trigger 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 State
is set to
Active Closed.
External Edge Trigger
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