How to use ai/sampleclock

[StephanD]

Hi,

can anyone explain how to use "ai/sampleclock"?

I have an USB 6210 card and I want to read data from analog and digital in.

A very basic setup looks like this:

string dev = "dev1";

Task t1 = new Task();
t1.AIChannels.CreateVoltageChannel(dev + "/ai0", "", AITerminalConfiguration.Differential, -0.1, 0.1, AIVoltageUnits.Volts);
t1.Timing.ConfigureSampleClock("", 100.0, SampleClockActiveEdge.Rising, SampleQuantityMode.ContinuousSamples);
t1.Control(TaskAction.Verify);

Task t2 = new Task();
t2.DIChannels.CreateChannel(dev + "/port0/line0", "", ChannelLineGrouping.OneChannelForEachLine);
t2.Timing.ConfigureSampleClock(dev + "/ai/SampleClock", 100.0, SampleClockActiveEdge.Rising, SampleQuantityMode.ContinuousSamples);
t2.Control(TaskAction.Verify);

I get an exception at the t2.Timing.ConfigureSampleClock call (also tried with "/ai/sampleclock", /dev1/ai/sampleclock")

Is it not possible to get analog and digital data at the same time with this card?

If I understand the forum posts correctly, I can't use the internal clock to get digital data (how can I check this with the Deviceinfo class?)

What clock source would I use if I only want to get digital data?

Kind regards

Stephan

[FrankLp]

Hi StephanD,

the USB 6210 has no own internal sample clock. What are you trying to achieve with your application?

Regards

[StephanD]

Hi FrankLp,

I'm trying to read analog and digital data at the same time. For analog data this works as expected. But I don't know how to get digital data with my card.

Regards

S.

[FrankLp]

Hi StephanD,

are you trying to read simultaniously? That means that you have to use threads or processes to get a parrallel execution. Without initiating that, you only got sequentiell execution of your code.

There are good Microsoft Knowledgbase articels on how to do threading in c#:

http://msdn.microsoft.com/en-ie/library/ms173178%28v=vs.80%29.aspx

Regards