DAQMx Error while generating a continuous pulse train

[Nesc]

Hi,

I'm new to these forums and my hardware (NI USB-6351).

I'm trying to generate continuous pulse train by using DAQmx/VisualC++. 

But I got the following error:

DAQmx error: "I/O type of the physical channel does not match the I/O type required for the virtual channel you are creating.
Physical Channel Name: ao0
Virtual Channel Name: Dev1/ao0
I/O Type Required for Virtual Channel: DAQmx_Val_CO

Task Name: pulse task

Status Code: -200430" char [2048]

the part of codes:

printError(DAQmxCreateTask("pulse task", &myPulseTask));
 

DAQmxErrChk (DAQmxCreateCOPulseChanFreq(myPulseTask, "Dev1/ao0", "", DAQmx_Val_Hz, DAQmx_Val_Low, 0.0, 100, 0.50));

DAQmxErrChk (DAQmxCfgImplicitTiming(myPulseTask, DAQmx_Val_ContSamps, 1000));

Does someone please help me in resolving this problem?

Thanks,

Sincere regards

[Mcdan]

Nesc,

You are creating a counter output task (DAQmxCreateCOPulseChanFreq), so this must be done with one of your 6351's counter channels rather than an analog output channel as you've specified (Dev1/ao0).  The 6351 has 4 counters which could be used (Dev1/ctr0, Dev1/ctr1, Dev1/ctr2 and Dev1/ctr3).

Hope that helps,
Dan

[Nesc]

Hi~ Mcdan,

 Thanks for your suggestion, I really set an incorrect virtual channel. This problem has been done.

sincere regards~