===how to transfer this code from VB6.0 to C#.NET?===

[Sadover]

VB code:

'     Add a counter input channel to the 6601 task.
'    DAQmxErrChk DAQmxCreateCICountEdgesChan(taskHandle_6601, "Dev2/ctr0", "" , DAQmx_Val_Edge1_Rising, 0, DAQmx_Val_CountDirection1_CountUp)
'
'    'set the source timebase of 6601
'    DAQmxErrChk DAQmxSetCICountEdgesTerm(taskHandle_6601, "Dev2/ctr0", "20MHzTimebase")
'
'    'set the sample clock of 6601
'    DAQmxErrChk DAQmxCfgSampClkTiming(taskHandle_6601, "/Dev2/PFI38", 20000#, DAQmx_Val_Rising, DAQmx_Val_AcquisitionType_ContSamps, 1000)

C# code:

                counterReadTask.CIChannels.CreateCountEdgesChannel(counterComboBox.Text, "", edgeType, Convert.ToInt64(initialCountTextBox.Text), countDirection);

               'set the source timebase of 6601

               how to transfer this line ???

                counterReadTask.Timing.ConfigureSampleClock(sampleClockTextBox.Text,
                    Convert.ToDouble(rateTextBox.Text), SampleClockActiveEdge.Rising,
                    SampleQuantityMode.ContinuousSamples, 1000);

thank you very much!

[endeavor_pi]

Please refer to the explanation of this parameter:

public string CounterTimebaseSource { set; get; }
    Member of NationalInstruments.DAQmx.CIChannel

Summary:
Specifies the terminal of the timebase to use for the counter.

Exceptions:
NationalInstruments.DAQmx.DaqException: The NI-DAQmx driver returned an error.

This is a property configuration for DAQ counter task.

NI Application Engineer

Ben 

[Sadover]

hi ben, thank you for your reply.

I have tried it, but it doesn't work.

my code :

counterReadTask.CIChannels.CreateCountEdgesChannel(counterComboBox.Text, "", edgeType, Convert.ToInt64(initialCountTextBox.Text), countDirection);

counterReadTask.CIChannels.All.CounterTimebaseSource = "20MHzTimebase";

counterReadTask.Timing.ConfigureSampleClock(sampleClockTextBox.Text,Convert.ToDouble(rateTextBox.Text), SampleClockActiveEdge.Rising,SampleQuantityMode.ContinuousSamples, 1000);

result:

[Sadover]

counter card:  PCI-6601

task: Buffered Event Counting （6601user manual P3-11-P3-12）Figure 3-12.  Buffered Event Counting 

gete:  Dev2/PFI38  source:20MHzTimebase

hope you can give me a example code, thank you

[endeavor_pi]

This property value is not supported. You can change the timebase source.

NI Application Engineer

Ben

[Sadover]

Ben

the VB code which I have given above can run correctly.

so, that means there must be a way to use 20MHzTimebase as timebase source, right?

I think you can help me to solve it

[Sadover · Accepted solution]

I have solve it

CountEdgesTerminal =20MHztimebase

thank you Ben