How to read from the beginning to reference trigger?


I develop a system a little on a NI DAQmx 6025 and want to know how can I get data from an early relaxation of reference.

I use "AcqVoltageSamples_IntClkDigStartAndRef.2008" to control the unit in c#

If I set up the Starttrigger only, I can trigger... (the measure is to start by climbing aboard PFI0)


myTask.AIChannels.CreateVoltageChannel (physicalChannelComboBox.Text,"", (AITerminalConfiguration)(-1), rangeMin, rangeMax, AIVoltageUnits.Volts ");

myTask.Timing.ConfigureSampleClock ("", sampleRate, SampleClockActiveEdge.Rising, SampleQuantityMode.FiniteSamples, 1000);

myTask.Triggers.StartTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeStartTriggerEdge.Rising);

Reader = new AnalogMultiChannelReader (myTask.Stream);


drive. SynchronizeCallbacks = true;

drive. BeginReadWaveform (-1, New AsyncCallback (myCallback), null);

... MyCallback...

data = reader. EndReadWaveform (ar);


Now, I want to stop my measurement by the trigger of the reference, so I set up the Referencetrigger on the same source (PFI0)

myTask.Triggers.ReferenceTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeReferenceTriggerEdge.Falling, 10);

(This line is after the configuration StartTrigger)

If I start the task and give the triggersignal, the measurement starts. But now the measure must stop if I start PFI0 again!

I don't know what I have to do to become a measure from the beginning to trigger Stop... I mean PFI0 PFI0 rising Edge edge

Thanks for the support!

Suchen für alle die noch immer nach einer Antwort, ich habs jetz!

For all who are looking for this answer, I get it now!


myTask = new Task ("aiTask");        Create a new task
Initialize local Variables
Double sampleRate = Convert.ToDouble (rateNumeric.Value);
Double rangeMin = Convert.ToDouble (minimumValueNumeric.Value);
rangeMax double = Convert.ToDouble (maximumValueNumeric.Value);
Create a virtual channel
myTask.AIChannels.CreateVoltageChannel (physicalChannelComboBox.Text, "", (AITerminalConfiguration)(-1),
rangeMin, rangeMax, AIVoltageUnits.Volts);
Set up sync Specs
myTask.Timing.ConfigureSampleClock ("", sampleRate, SampleClockActiveEdge.Rising, SampleQuantityMode.FiniteSamples, 1000);
Configure start and reference triggers
myTask.Triggers.StartTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeStartTriggerEdge.Rising);
myTask.Triggers.ReferenceTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeReferenceTriggerEdge.Rising, 100);

Check the task
myTask.Control (TaskAction.Verify);
Create the object reader
Reader = new AnalogMultiChannelReader (myTask.Stream);
Start the task, and set the playback position
myTask.Start ();
myTask.Stream.ReadRelativeTo = ReadRelativeTo.CurrentReadPosition;


Temp = reader. ReadWaveform (60000);

myTask.Dispose ();


Mit dieser Lösung kann man von mension zu messen mension.

With this resolve you can measure from edge to edge.

Tags: NI Software

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