Using NI-DAQ 6008 concurrent analog input and output

[TASKINSEN]

Hi,

I am using NI DAQ USB -6008. I tried to generate sinusoidal wave and it is running.  when i generate sinusoidal wave, i want to read the signal from the analog input. My test board generate pulse according to coming signal. Therefore i must read and write proccess concurrently. The sinusoidal signal i try to generate f=100Hz, Amplitude = 5V. I write code in C#.  the signal generator function and analog port read function is given below;

thanks...

public

void SinusSignalGenerator(double amplitude, double frequency, int LoopTime)

{

Task SignalGeneratorTask = new Task(); double[] data = new double[1000]; double freq; double amp;

freq = frequency / 1000;

if (freq > 0.2)

freq = 0.2;

amp = amplitude;

if (amp > 2.4)

amp = 2.4;

for (UInt32 i = 0; i < 1000; i++)

data[i] = amp *

Math.Sin((double)i * Math.PI * 2 * freq) + amp;

SignalGeneratorTask.AOChannels.CreateVoltageChannel(

"Dev1/AO0", "", 0, 5, AOVoltageUnits.Volts); AnalogSingleChannelWriter writer = new AnalogSingleChannelWriter(SignalGeneratorTask.Stream); while (LoopTime-- != 0) // for (int j = 0; j <= LoopNumber; j++ )

writer.WriteMultiSample(

true, data);

}

double

AnalogPortRead(string PortName)

{

Task TestTask = new Task();

TestTask.AIChannels.CreateVoltageChannel(PortName,

"", AITerminalConfiguration.Rse, 0, 5, AIVoltageUnits.Volts);

TestTask.Control(

TaskAction.Verify);

NationalInstruments.DAQmx.

AnalogMultiChannelReader reader = new AnalogMultiChannelReader(TestTask.Stream);

SourceArray = reader.ReadSingleSample();

return (double)SourceArray.GetValue(0);

}

[McKala[DE]]

Hello TASKINSEN,

Are you trying to synchronize your AI and AO lines?   If you are trying to synchronize the two lines, you can refer to the shipping example SyncAIAO_DigStart under C:\Program Files\National Instruments\MeasurementStudioVS2003\DotNET\Examples\DAQmx\Synchronization\Multi-Function\SyncAIAO_DigStart\Cs.  Since this code is shipped with the NI-DAQmx driver and is pre-written and commented, I think that will be a better starting point than having me write out the code here

If that is not what you are trying to do, post again and we'll try to help you out.

Regards,