Microscan MS-96 Manual de usuario descargar pdf (Pagina 56)

Trigger

4-8 MS-9 Scanner User’s Manual

External Trigger Level

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.

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

ing apparatus are variable and the time the scanner spends scanning

each object is not predictable. It also allows the user to determine if a

noread has occurred.

Definition: External Trigger 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 endures until the object moves out of the sensor

range and the active trigger state changes again.

Serial Cmd: <K200,2>

Figure 4-1 Trigger Level

Initiate Read Cycle:

Object # 1, moving in front of the detector

beam, causes a change in the trigger state,

initiating the read cycle.

End Read Cycle:

The same object, moving out of the detector

beam, causes another change in the trigger

state, ending the read cycle.

Associated waveforms assume

External Trigger State is set

to Active Closed.

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 225 226

Sin comentarios

Microscan MS-96 Manual de usuario Pagina 56