External Trigger Edge - Microscan MS-890 User Manual

Trigger

External Trigger Edge

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 No Read when a No Decode Timeout occurs.
Serial Cmd: <K200,3>
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. 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.
Note: In External Trigger Level, sending a non-delimited start serial character will start a
read cycle and sending a non-delimited stop serial character will end it. See
(Non-Delimited) and
4-8
Initiate Read Cycle:
Object # 1, moving in front of the
detector beam, causes a change in
the trigger state, which initiates the
read cycle.
Initiate Second Read Cycle:
Object # 2, moving in front of the
detector beam, causes another
change in the trigger state. This sig-
nal initiates a new read cycle and
ends the previous read cycle unless
Timeout is enabled and a good read
or timeout has not occured.
Stop Character (Non-Delimited) on page 4-13.
MS-890 Industrial Automation Scanner User Manual
Start Character