How to read voltage on several channels using the 6255\SCB-68

Hi all

I have been able to get the following code to compile, run and display the data as expected. When you read the tension (CSR) on Dev0/ai65

... Instruments\NI-national DAQ\Examples\DAQmx ANSI C\Analog In\Measure Voltage\Cont Acq - Int Clk\ContAcq - IntClk.c

* I think I'm using CSR, but I have no idea since I don't see an argument to specify

I'm reading two different data points:

1 discovered (CSR) tension on Dev0/ai65

2 show the (differential) voltage difference between Dev0/ai17 and Dev0/ai25

Can someone point me to an example (or a web link) where two different data points are read.

* edit - I am filling this task using C++

Thank you

Chad

This code is a start, and it works



using namespace std;








using namespace std;

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

{
<>

	< "\t="" starting="" the="" ni="" daqmx="" data="">

	<>
int loop;
< 3;="">

	{

		Int32       = 0 error;

		TaskHandle  taskHandle1 = 0;

		TaskHandle  taskHandle2 = 0;

		Int32       read1.

		Int32       Read 2;

		float64     data1 [1000];

		float64     data2 [1000];

		tank        errBuff [2048] = {'\0'};
Channel settings and the schedule of the analog voltage DAQmx

		DAQmxErrChk (DAQmxCreateTask ("task1", & taskHandle1));

		DAQmxErrChk (DAQmxCreateAIVoltageChan (taskHandle1, "ai25/Dev1", "", DAQmx_Val_Cfg_Default,-10,0, 10.0, DAQmx_Val_Volts, NULL));

		DAQmxErrChk (DAQmxCfgSampClkTiming (taskHandle1, "", 10000.0, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, 1000));
DAQmxErrChk (DAQmxCreateTask ("task2", & taskHandle2));

		DAQmxErrChk (DAQmxCreateAIVoltageChan (taskHandle2, "Dev1/ai17", "", DAQmx_Val_Cfg_Default,-10,0, 10.0, DAQmx_Val_Volts, NULL));

		DAQmxErrChk (DAQmxCfgSampClkTiming (taskHandle2, "", 10000.0, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, 1000));
Starting code DAQmx

		DAQmxErrChk (DAQmxStartTask (taskHandle1));
Reading DAQmx code

		DAQmxErrChk (DAQmxReadAnalogF64 (taskHandle1, 1000, 10.0, DAQmx_Val_GroupByChannel, data1, 1000, & read1, NULL));

		< read1;="">

			< data1[i]="">< "="">

		<>
DAQmxStopTask (taskHandle1);

		DAQmxClearTask (taskHandle1);
Starting code DAQmx

		DAQmxErrChk (DAQmxStartTask (taskHandle2));
Reading DAQmx code

		DAQmxErrChk (DAQmxReadAnalogF64 (taskHandle2, 1000, 10.0, DAQmx_Val_GroupByChannel, data2, 1000, & read2, NULL));

		< read2;="">

			< data2[i]="">< "="">

		<>

		DAQmxStopTask (taskHandle2);

		DAQmxClearTask (taskHandle2);
Stop and clear spots

	Error:

		If (DAQmxFailed (error))

			DAQmxGetExtendedErrorInfo (errBuff, 2048);

		If (taskHandle1! = 0)  {}

			DAQmxStopTask (taskHandle1);

			DAQmxStopTask (taskHandle2);

			DAQmxClearTask (taskHandle1);

			DAQmxClearTask (taskHandle2);

		}
If (DAQmxFailed (error))

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

	end of loop
<>

	< "\t="" stopping="" the="" ni="" daqmx="" data="">

	<>
return 0;
}

Tags: NI Hardware

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