How to change DI unbuffered mode

My request is when a fall from digital input (camera ready) edge arrives, it will trigger a pulse counter 0, open the shutter of camer.

The following code does this:

camShutterOutputTask.COChannels.CreatePulseChannelTime ("Dev1/ctr0", "",)
COPulseTimeUnits.Seconds, COPulseIdleState.Low,
0,
0.000001,
(((double) exposure_time) / 1e6);
camShutterOutputTask.Triggers.StartTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeStartTriggerEdge.Falling);

camShutterOutputTask.Triggers.StartTrigger.Retriggerable = true;

On my PCIe-6323, PFI0 is by default configured with P1.0, so I connected physically ready to P1.0 camera entry.

I just want to trigger the camera several times. After the required number of triggers, I'll just ignore all the following input signals. The following code configures the input channel to do so:

camReadyInputTask.DIChannels.CreateChannel ("Dev1/port1/$line0", "", ChannelLineGrouping.OneChannelForEachLine);
() camReadyInputTask.Timing.ConfigureChangeDetection

                   "",

                   "Dev1/port1/$line0,"

                   (SampleQuantityMode.FiniteSamples, num_of_frames);

The problem is when I run the program, I get the error: "some lines do not support buffering operations. Ensure that lines are supported buffering operations are used in the task. If you use the calendar to change detection, the task should be replaced by without buffer to support these lines. »

If I use port 0 in the code instead of port 1, he makes the mistake, and it limits the number of input signals just like what I need. However, port 0 is not connecting to any PFI, so I can't use it in the trigger to start for the shutter of the camera.

Does anyone know how is:

1. change a task in unbuffered mode or

2 re - router port 0 to a PFI?

Thanks for the reply Ashly. I'm new to DAQmx and there is still a lot to learn.

The loop thing involves waiting timed software and concerns me.

I have found a workaround that calls a callback function whenever the meter changes its output:

camShutterOutputTask.SynchronizeCallbacks = true;
camShutterOutputTask.CounterOutput += new CounterOutputEventHandler (camShutter_callback);
...
' Private Sub camShutter_callback (object sender, CounterOutputEventArgs e)
{
   trigger_count ++;
   Console.WriteLine ("trigger count =" + trigger_count. (ToString());
   If (trigger_count > = num_of_frames * 2)
   {
      Try
      {
         camShutterOutputTask.Stop ();
         camShutterOutputTask.Dispose ();
...
startCaptureButton.Enabled = true;
      }
      catch (System.Exception Exception)
      {
         MessageBox.Show (exception. (Message);
      }
   }
}

In camShutter_callback(), I continue to follow a global counter and if it is greater than num_of_frames * 2 (since the callback will be triggered by rising and falling pulse edge), I stop all tasks.

Tags: NI Software

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How to change DI unbuffered mode

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