DIO 653X Multiple Devices / Multiple Groups

[jimhar]

Hi,

We have two DIO 653X devices where each device has two groups programmed using LabVIEW traditional DAQ VIs.  One group is configured for continuous pattern input and the other is configured for software retriggerable pattern output.  PCLK1 and PCLK2 are tied together and is used for clocking in/out the data using an external clock.

The groups are configured after the external clock is active.  The pattern input is continuously sampling data while the retriggerable output is triggered by the ACK2 line and is a one-shot type operation.  Note that the pattern input group does not have ACK1 connected.

We see a strange issue where it appears that performing a pattern output operation causes the other device to get in a strange state wherein which LabVIEW needs to be closed in order to reset device.  It appears the pattern input is not clocking in expected data.

This configuration should be possible, right?   I don't believe it is a DUT issue since reloading LabVIEW seems to  clear up issue.

Thanks in advance.

Jim

[jimhar]

Correction:  REQ1 and REQ2 are being used (not PCLK1, PCLK2).

[Travis_W]

Hi Jim,

That is very interesting behavior.  Do I understand correctly that only one of the devices seems to be behaving incorrectly in this state?

Also, do you receive any errors when this state is encountered?  If you stop and restart the input operation on the card that is showing this behavior, does it throw an error then?  Finally, if no errors are thrown, how are you verifying that data is not being clocked in properly?  This KnowledgeBase mentions some considerations for syncrhonization of pattern input and ouput.

See if the same behavior is observed if you start with the example code on this Developer Zone article.  Thanks, Jim.  Let me know if any of these suggestions help.  If not, feel free to post your code so we can all take a look.

Have a great day!
Travis W

Message Edited by Travis W on 10-20-2006 08:12 AM