Timeout effects in two LL Ring IMAQ codes

Hello,
I am learning two IMAQ examples:
LL RIng.VI
LL Ring without timeout.VI
I am wondering:
(1) Why in the second VI the inclusion of Last Valid Frame Property Node causes ' the timeout take effects only when IMAQ Extract Vi is called'?
(2) In the second code how timeout effect works when IMAQ Extract is called? Does it mean that only when the IMAQ Exact (and corresponding image processing) takes too long (exceeding 2000ms) a timeout error will be generated?
Thanks for advise.
-Dejun
Message Edited by Dejun on 09-09-2007 11:27 AM
Attachments:
LL_Trigger_Ring.jpg ‏51 KB
LL_Trigger_Ring_Without_Timeout.jpg ‏73 KB

Hello Dejun,
The Frame timeout (ms) input on the IMAQ Configure Trigger2.vi is not a redundant input. This timeout input specifies the amount of time (in milliseconds) that NI-IMAQ waits for the trigger to occur and the image to be captured. An error will occur if the image is not acquired in the timeout period, but this timeout period only begins when IMAQ Extract is called. The LL Triggered Ring without Timeout.vi avoids incurring a timeout error by refraining from calling IMAQ Extract until a new buffer has been acquired.
For more information on this and other shipping examples, please make sure to read the text in the Information window located in the upper right-hand corner of the NI Example Finder. When you single-click on an example in the NI Example Finder, this window populates with important information about the example, including a description that often walks you through the mechanics of how the example operates. If this information is insufficient for your needs, remember that you also have a valuable resource in LabVIEW's built-in Help files. By pressing Ctrl+H on your keyboard, you can bring up a Context Help window that will display relevant information on VIs and other block diagram objects that you mouse over. From the Context Help window, you can find a Detailed Help link for the most thorough information available.
Good luck with your application!
Best Regards,
Travis McCarty

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>
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>
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>
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Timeout effects in two LL Ring IMAQ codes

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