Microscan MS-4X Manual do Utilizador descarregar pdf (Página 104)

5-8

MS-4X Imager Us

er Manual

Trigger Mode and Filter Duration

External Level

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

while the object is in a read cycle, between the rising edge and the 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. This applies both to

External Level and External Edge.

External Edge

Usage: This mode is effective in an application where the speeds of the conveying

apparatus are variable and the time the imager spends reading each object

is not predictable. It also allows the user to determine if a No Read has

occurred.

Definition: External Level allows the read cycle (active state) to begin when a trigger

(change of state) from an external sensing device is received. The read

cycle persists until the object moves out of the sensor range and the active

trigger state changes again.

Serial Cmd: <K200,2>

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

speed is constant, or if spacing, object size, or read cycle timeouts are

consistent.

Definition: External 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 the End of Read Cycle setting, a timeout or new trigger

occurs.

Serial Cmd: <K200,3>

Initiate Read Cycle:

Object #1, moving in front of the

detector beam, causes a

change in the trigger state,

which initiates the read cycle.

End Read Cycle:

The same object, moving out of

the detector beam, causes

another change in the trigger

state, which ends the read cycle.

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.

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Microscan MS-4X Manual do Utilizador Página 104

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