Can I synchronize the counters on two different computers in the C API?

I installed the M-series cards (6254) in several computers. I would like to synchronize the counters for each card.  The best way that I came with to do this was to have the counter on each counter entries read a common external clock signal running at 10 KHz I have would then feed a second signal to each card and trigger the task that runs each counter starts when the second line goes high.

Following the examples provided with the C API, it was easy to get each card KHz signal and then to match the beginning of the counter that I tried to read

DAQmxCfgDigEdgeStartTrig (taskHandle, inputLineStr, DAQmx_Val_Rising);

However, this did not work and gave me the following error:

DAQmx error: the specified property is not supported by the device or is not applicable to the task.

Property: DAQmx_StartTrig_Type


Task name: task


State code:-200452

End of the program, press the Enter key to exit

I know it's very simple sync the cards within a computer using the RTSI interface, but it is not possible that my cards have to reside in different computers.

It is even possible to synchronize the counters on computers, and if yes how can I do it with the C API?

------------------

Here's what I've written so far:







#define DAQmxErrChk (functionCall) if (DAQmxFailed (error = (functionCall))) goto error; on the other


int main (void)

{

        int         error = 0;

        TaskHandle  taskHandle = 0;

        uInt32      data = 0;

        tank        errBuff [2048] = {'\0'};


DAQmxErrChk (DAQmxCreateTask ("task", & taskHandle));

        DAQmxErrChk (DAQmxCreateCICountEdgesChan(taskHandle,"/Dev1/ctr0","",DAQmx_Val_Rising,0,DAQmx_Val_CountUp));

        DAQmxErrChk (DAQmxConnectTerms ("/ 10MhzRefClock/Dev1", "/ PFI8/Dev1", DAQmx_Val_DoNotInvertPolarity));

        DAQmxErrChk (DAQmxCfgDigEdgeStartTrig(taskHandle,"/Dev1/PFI14",DAQmx_Val_Rising));


DAQmxErrChk (DAQmxStartTask (taskHandle));


printf ("without interruption of the poll. Press Ctrl + C to interrupt\n");

        While {} (1)

                DAQmxErrChk (DAQmxReadCounterScalarU32(taskHandle,10.0,&data,));

                printf ("\rCount: %u", data);

                fflush (stdout);

       	}

Error:

        puts("");

        If (DAQmxFailed (error))

                DAQmxGetExtendedErrorInfo (errBuff, 2048);

        If (taskHandle! = 0) {}

                /*********************************************/

                Stop DAQmx code

                /*********************************************/

                DAQmxStopTask (taskHandle);

                DAQmxClearTask (taskHandle);

        }

        If (DAQmxFailed (error))

                printf ("error DAQmx: %s\n",errBuff); ")

        printf ("end of the program, press the Enter key to quit\n");

        GetChar ();

        return 0;

}

Hi neurostu,

Arms start triggers are disabled by default, so they do not have a default PFI line.

You will need to set some properties DAQmx to configure a trigger for start of arms. Try adding between DAQmxCreateCICountEdgesChan() and DAQmxStartTask():

DAQmxSetArmStartTrigType (taskHandle, DAQmx_Val_DigEdge);

DAQmxSetDigEdgeArmStartTrigSrc (taskHandle, "/ Dev1/PFI14" ');

DAQmxSetDigEdgeArmStartTrigEdge (taskHandle, DAQmx_Val_Rising);

You have the file "help NOR-DAQmx C reference"? It should contain descriptions of the trigger > more > arm Start properties.

Brad

Tags: NI Hardware

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