| Data Acquisition Toolbox™ | |
A trigger event is generated immediately after a trigger occurs. This event executes the callback function specified for TriggerFcn. Under most circumstances, the callback function is not guaranteed to complete execution until sometime after Logging is set to On for analog input (AI) objects, or Sending is set to On for analog output (AO) objects.
Trigger event information is stored in the Type and Data fields of the EventLog property. The Type field value is Trigger. The Data field values are given below.
Data Field Value | Description |
|---|---|
AbsTime | The absolute time (as a clock vector) the event occurred. |
RelSample | The acquired (AI) or output (AO) sample number when the event occurred. |
Channel | The index number for each input channel serving as a trigger source (AI only). |
Trigger | The trigger number. |
Usage | AI, AO, Common to all channels |
Access | Read/write |
Data type | String |
Read-only when running | No |
The default value is an empty string.
| TriggerDelayUnits | TriggerRepeat | |
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