Microscan MS-4 Specifikace stáhnout pdf (Strana 55)

Chapter 4 Read Cycle/Trigger

MS-3 Laser Scanner User’s Manual 4-7

4–Read Cycle/Trig-

External Trigger Edge

Important: Level and Edge apply to the active logic state (Positive or Negative)

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.

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.

Usage: This mode is highly recommended in any application where conveying

speed is constant or if spacing, object size, or timeouts are consistent.

Serial Cmd: <K200,3>

Object

detector

Object

detector

Positive

Figure 4-2 Trigger Edge

Initiate Read Cycle:

Object # 1, moving in front of the detec-

tor 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

Associated waveforms assume

External Trigger State is set

to Positive.

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Microscan MS-4 Specifikace Strana 55