Microscan MS-4X Manuel d'utilisateur télécharger pdf (Page 72)

Trigger Mode

4-6 MS-880 Industrial Long Range Scanner User’s Manual

4–Read Cycle/Trig-

External Trigger Level

Important: Level and Edge apply to the active logic state (Active Off (I

OFF

) or Active

On (I

)) 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 disappear-

ance 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

“Start and End Trigger Characters (non-delimited)” in chapter 4.

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 sen-

sor range and the active trigger state changes again.

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.

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 On.

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 311 312

Pas de commentaire

Microscan MS-4X Manuel d'utilisateur Page 72