Figure 4-2 Trigger Edge - Microscan MS-710 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 (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.
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 tim-
eout has not occurred.
Serial Cmd: <Kg3>
Important: Level and Edge apply to the active logic state (Active Open or Active
Closed) that exists while the object is in a read cycle, between the rising edge and fall-
ing 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.
MS-710 Scanner User's Manual
4-8
Associated waveforms assume
External Trigger State is set
to Active Closed.

Figure 4-2 Trigger Edge