Triggered Starting and/or Stopping of an Acquisition
PrintTable of Contents
Description
All National Instruments IMAQ boards provide at least one trigger input, which can be used for various triggering functions. The most simple use is to trigger the start of a one-shot or continuous acquisition. The trigger can be supplied to an external trigger input, or in frame grabbers equipped with the Real-Time System Integration (RTSI) bus, it can be supplied from another hardware device such as a National Instruments data acquisition (DAQ) board.A stop trigger can be implemented in software by using an IMAQ occurrence which is activated by the receipt of an external trigger. The occurrence then allows code to execute which exits the processing loop and halts the acquisition.
Common Applications
Any application in which an event may occur at any time is a candidate for start/stop triggering. System resources are conserved by only acquiring and processing images during the actual event of interest.
What To Expect
Continuous or single acquisition triggered by an external event.
Related Links:
Triggering IMAQ Acquisition Examples
Pre- and Post-Trigger Saving to Disk
DAQ Triggered IMAQ Images
Synchronize DAQ Scan Clock with IMAQ Acquisition
Reader Comments | Submit a comment »
Legal
This tutorial (this "tutorial") was developed by National Instruments ("NI"). Although technical support of this tutorial may be made available by National Instruments, the content in this tutorial may not be completely tested and verified, and NI does not guarantee its quality in any way or that NI will continue to support this content with each new revision of related products and drivers. THIS TUTORIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND AND SUBJECT TO CERTAIN RESTRICTIONS AS MORE SPECIFICALLY SET FORTH IN NI.COM'S TERMS OF USE (http://ni.com/legal/termsofuse/unitedstates/us/).