How to read digital signals with pre-and post-trigger on a card PCI-6251

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  I write because I can not find a solution to my problem.

  As written in the title, I just want to do an continuous (continuous sampling) a digital line. The fact that it's a digital line instead of an analog is no big deal, I guess. I want to start the acquisition on a rising edge of digital trigger (PFI0 for example) and stop acquisition on a trigger too (forehead down on the same signal (PFI0 even then) or a new front amount). This way I could precisely control the time of acquisition or of the start or stop other devices.

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  One way is to use counters as Kevin described. For me, it's usually easier to create the dummy task that has the timing engine (as I HAVE), but it depends on what resource you have on your board you will not need .

  In fact, the example is the same thing that you need to measure continues - just what you need to do is remove the counter part and replace the trigger reference to be external (your stop trigger).

  with this approach, you should be able to do the continuous measurement - I noticed that you need DI - in fact with few changes you should be able to use this example. DI does not have its own timing engine, that's why you should use the external sample clock. If we use the example to create dummy HAVE to provide the sample clock, and we start DI task until we start to HAVE fake, then we can get pretty much continuous clock which begins start trigger and stop the trigger of reference.

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  INFO [main] - graphical revision: 1.16 modified by: 470707 update the: kill Jan 20 16:13:52 IST 2015
  INFO [main] - check the graphical configuration...
  INFO [main] - graphical configuration is valid.
  INFO [main] - graphical initialization (SurveyResponses)
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  INFO [main] - Phase 0 initialized successfully.
  INFO [WatchDog_0] - starting all the nodes in the phase [0]
  INFO [WatchDog_0] - has successfully started all nodes in phase!
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  org.jetel.exception.JetelRuntimeException: component [XLSDataReader:XLSDATA_READER1] finished with ERROR status.
  at org.jetel.graph.Node.createNodeException(Node.java:535)
  at org.jetel.graph.Node.run(Node.java:514)
  at java.lang.Thread.run(Thread.java:722)
  Caused by: org.jetel.exception.BadDataFormatException: how (long) field cannot be set to the value "comment." does not match the specified format ' ' with good reason 'incomplete analysis. " in folder 1, 23 ("comment"), metadata field 'Survey_Responses_Sheet1 '; value: 'How' (note that for parallel processing ParallelReader or server, run the registration number may be incorrect)
  at org.jetel.data.LongDataField.fromString(LongDataField.java:465)
  at org.jetel.data.parser.XLSXDataParser.parseNext(XLSXDataParser.java:492)
  at org.jetel.data.parser.XLSParser.getNext(XLSParser.java:136)
  at org.jetel.util.MultiFileReader.getNext(MultiFileReader.java:432)
  at org.jetel.component.XLSReader.execute(XLSReader.java:562)
  at org.jetel.graph.Node.run(Node.java:485)
  ... 1 more
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  at javolution.text.TypeFormat.parseLongString (unknown Source)
  at javolution.text.TypeFormat.parseLong (unknown Source)
  at javolution.text.TypeFormat.parseLong (unknown Source)
  at javolution.text.TypeFormat.parseLong (unknown Source)
  at org.jetel.util.formatter.JavolutionNumericFormatter.parseLong(JavolutionNumericFormatter.java:74)
  at org.jetel.data.LongDataField.fromString(LongDataField.java:462)
  ... 6 more

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  ERROR [WatchDog_0] -! Completed with error - graphic stop run!
  INFO [WatchDog_0]-* the summary execution of Phases * -.
  INFO [WatchDog_0] - Phase # finished status RunTime (sec) MemoryAllocation (KB)
  INFO [WatchDog_0] - 0 4 175279 ERROR
  INFO [WatchDog_0]-* end of summary * -.
  INFO [WatchDog_0] - finished the watchdog thread - total running time: 4 (s)
  INFO [main] - freeing graphics resources.
  ERROR [main]-
  --------------------------------------------------------------------------------------------------------------------------------------------------------- Error details ----------------------------------------------------------------------------------------------------------------------------------------------------------
  Component [XLSDataReader:XLSDATA_READER1] finished with ERROR status.
  How (long) field cannot be set to the value "comment." does not match the specified format ' ' with good reason 'incomplete analysis. " in folder 1, 23 ("comment"), metadata field 'Survey_Responses_Sheet1 '; value: 'How' (note that for parallel processing ParallelReader or server, run the registration number may be incorrect)
  ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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  I think the 256 character limit is a red herring.  All data is there, the front-end integrator is truncating only for display purposes.

  Your data is a string, it should certainly be classified as a string in the metadata.  For a long time is for numeric values.

  I don't think there is a problem here, if you were to write this data to the trash or a text file (after reading it in), you will see that your data is not truncated.

  Kind regards

  Patrick Rafferty

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