Problem with ReadDigChan_ChangeDetection_Events VB example...

[dtnpsi]

Following is based on the ReadDigChan_ChangeDetection_Events VB.NET example (with hard-coded channel strings)...

myTask = New Task()

myTask.DIChannels.CreateChannel("Dev1/Port1/Line0", "myChannel", ChannelLineGrouping.OneChannelForAllLines)

myTask.Timing.ConfigureChangeDetection("Dev1/Port1/Line0",  "Dev1/Port1/Line0", SampleQuantityMode.ContinuousSamples, 1000)

...but ConfigureChangeDetection throws an exception:

 Requested value is not a supported value for this property.

Property: NationalInstruments.DAQmx.Timing.SampleTimingType
You Have Requested: NationalInstruments.DAQmx.SampleTimingType.ChangeDetection
You Can Select: NationalInstruments.DAQmx.SampleTimingType.OnDemand

Task Name: _unnamedTask<0>

Status Code: -200077" String

[POB]

I just got the same problem, same error message! The example provided by NI doesnt work. Im working in C# with a USB-6212 card. Is there a solution?

[-J-]

Have anybody solved this problem? Just ran into it myself...

-J- 

[-J-]

Never mind. It seems that my board does not have hardware timed digital I/O lines so I have to poll the line value in software and compare it to the previous value and check whether it's a rising or falling edge.

-J-