Python DAQmxReadCounterScalarU32 error-200230

Hi all

I use Python 3.2 and NOR-6521 Council.

I try to count the number of rising of my signal edges when I click on a start button, but I still have the code of error-200230.

My program is the following:

#Variables

DAQmx_Val_Rising = int32 (10280)

InitialCount = uInt32 (0)

DAQmx_Val_CountUp = int32 (10128)

Timeout = float64 (10)

NULL = types. POINTER (ctypes.c_int))

value = uInt32)

#Source channel

chan_count = ctypes.create_string_buffer (b' 1/ctr0 ')

#Create a task

TaskHandle = uInt32

TaskCount = TaskHandle (0)

NIDAQ. DAQmxCreateTask ("", ctypes.byref (TaskCount))

#Create a counter entry

NIDAQ. DAQmxCreateCICountEdgesChan(TaskCount,chan_count,"",DAQmx_Val_Rising,InitialCount,DAQmx_Val_CountUp)

#Start task

NIDAQ. DAQmxStartTask (TaskCount)

#Read the number of meet the edges when click the GUI

NIDAQ. DAQmxReadCounterScalarU32(TaskCount,timeout,value,null)

I think my mistake is in the declaration of value, but I don't understand why.

Does anyone have an answer? It is very urgent.

Thank you

After several tries, I found the solution

#Read the number of meet the edges when click the GUI

NIDAQ. DAQmxReadCounterScalarU32 (TaskCount, timeout, types. POINT (ctypes.c_uint32), (value), null)

Tags: NI Hardware

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    Hello

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spectrum = RFmxSpecAnMXSpectrum
    

    # This does not work!
    
specAn.Spectrum.Results.FetchSpectrum (", timeout, spectrum)

    Here's the complete code:

    import clr
    
import sys
    

    # location of the assemblies
    
assy_path = r'C:\Program files (x 86) \National Instruments\MeasurementStudioVS2010\DotNET\Assemblies\Current'
    
sys. Path.Append (assy_path)
    

    CLR. AddReference ("NationalInstruments.RFmx.SpecAnMX.Fx40")
    
CLR. AddReference ("NationalInstruments.RFmx.InstrMX.Fx40")
    

    from NationalInstruments import *.
    
from NationalInstruments.RFmx.InstrMX import *.
    
from NationalInstruments.RFmx.SpecAnMX import *.
    

    # The VSA settings
    
resourceName = "5606_slave."
    
centerFrequency = 10.0e9        # Hz
    
referenceLevel = - 10            # dBm
    
externalAttenuation = 0.00      # dB
    
Timeout = 10                    seconds #.
    
span = 1.0e + 6                   # Hz
    
RBW = 100e3
    
averagingCount = 10
    

    instrSession = RFmxInstrMX(resourceName, '')
    

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rbwAuto = RFmxSpecAnMXSpectrumRbwAutoBandwidth.True
    
rbwFilterType = RFmxSpecAnMXSpectrumRbwFilterType.Gaussian
    
averagingEnabled = RFmxSpecAnMXSpectrumAveragingEnabled.False
    
averagingType = RFmxSpecAnMXSpectrumAveragingType.Rms
    
#specAn = instrSession.GetSpecAnSignalConfiguration ();
    
specAn = RFmxSpecAnMXExtension.GetSpecAnSignalConfiguration (instrSession)
    
specAn.ConfigureRF('',centerFrequency,referenceLevel,externalAttenuation)
    
specAn.Spectrum.Configuration.ConfigureSpan('', span)
    
specAn.Spectrum.Configuration.ConfigureRbwFilter (", rbwAuto, rbw, rbwFilterType)
    
specAn.Spectrum.Configuration.ConfigureAveraging (", averagingEnabled, averagingCount, averagingType)
    
specAn.SelectMeasurements (", RFmxSpecAnMXMeasurementTypes.Spectrum, bool ())
    
specAn.Commit ("")
    

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specAn.Initiate('','')
    

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_, pkAmp, pkFreq, freqRes = specAn.Spectrum.Results.FetchMeasurement (", timeout, float (), float (), float ())
    
Print "peak power: dBm {:0.2f} to {:0.6f} GHz'.format(pkAmp,pkFreq*1e-9)}}"
    

    """
    
A .NET method may require user pass the variable name that it wishes to
    
change as an argument. Python is not compatible "pass by reference", but the
    
the variable name must exist in python, before he can be handed over to the .NET method.
    
The .NET method will simply point to the new instance.
    

    http://nbviewer.IPython.org/GitHub/jonnojohnson/Agilent/BLOB/master/Python_Automation/Python_Automation.ipynb
    
"""
    

    # create the name of the variable before you pass it to the method .NET
    
spectrum = RFmxSpecAnMXSpectrum
    

    # This does not work!
    
specAn.Spectrum.Results.FetchSpectrum (", timeout, spectrum)
    

    instrSession.Close)

    Here is the error:

    Traceback (most recent call changed):

    File "", line 3, in
    specAn.Spectrum.Results.FetchSpectrum ("", timeout, spectrum)

    ArgumentException: Object of type 'System.RuntimeType' cannot be converted to type ' NationalInstruments.Spectrum'1 [System.Single] & ".
    at System.RuntimeType.TryChangeType (Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
    at System.Reflection.MethodBase.CheckArguments (Object [] parameters, Binder binder, BindingFlags invokeAttr, CultureInfo culture, sig Signature)
    at System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck (Object obj, BindingFlags invokeAttr, Binder binder, Object [] parameters, CultureInfo culture)
    at System.Reflection.RuntimeMethodInfo.Invoke (Object obj, BindingFlags invokeAttr, Binder binder, Object [] parameters, CultureInfo culture)
    to Python.Runtime.MethodBinder.Invoke (inst IntPtr, IntPtr args, kw, MethodBase info, methodinfo MethodInfo [] IntPtr)

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    Ah! That's about all. Here's what worked:

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_, spectrum is specAn.Spectrum.Results.FetchSpectrum('',timeout,spectrum)

    Here is the result and the final code for future reference:

    import clr
    
import sys
    
Import os
    
import matplotlib.pyplot as plt

    Import numpy as np

    # To Program Files Windows environment variable

    Program_Files = os.environ ['ProgramFiles (x 86) ""]
    assy_path = os.path.join (program_files,
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    "MeasurementStudioVS2010,"
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    "Assemblies."
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    import NationalInstruments
    Import System

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    resourceName = "5606_slave."
    centerFrequency = 25.0e9 # Hz
    referenceLevel = #-10 dBm
    externalAttenuation = # 0.00 dB
    Timeout = 10 # seconds
    span = 1.0e + 6 # Hz
    RBW = 100e3 # Hz
    averagingCount = 10

    instrSession = RFmxInstrMX(resourceName, '')

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    rbwAuto = RFmxSpecAnMXSpectrumRbwAutoBandwidth.True
    rbwFilterType = RFmxSpecAnMXSpectrumRbwFilterType.Gaussian
    averagingEnabled = RFmxSpecAnMXSpectrumAveragingEnabled.False
    averagingType = RFmxSpecAnMXSpectrumAveragingType.Rms
    specAn = RFmxSpecAnMXExtension.GetSpecAnSignalConfiguration (instrSession)
    specAn.ConfigureRF('',centerFrequency,referenceLevel,externalAttenuation)
    specAn.Spectrum.Configuration.ConfigureSpan('', span)
    specAn.Spectrum.Configuration.ConfigureRbwFilter (", rbwAuto, rbw, rbwFilterType)
    specAn.Spectrum.Configuration.ConfigureAveraging (", averagingEnabled, averagingCount, averagingType)
    specAn.SelectMeasurements (", RFmxSpecAnMXMeasurementTypes.Spectrum, bool ())
    specAn.Commit ("")

    # run acquisition
    specAn.Initiate('','')

    # get x data
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    # get data
    analogwaveform = NationalInstruments.AnalogWaveform [System.Single] (0)
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    close a session #.
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    startFrequency = spectrum. StartFrequency
    frequencyIncrement = spectrum. FrequencyIncrement
    sampleCount = spectrum. SampleCount
    stopFrequency = startFrequency + frequencyIncrement *(sampleCount+1)
    freqArray = np.linspace (startFrequency, stopFrequency, sampleCount)
    current = list (analogwaveform. GetRawData())

    results of tracking #.
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    PLT.ylabel ('Power (dBm) ")
    PLT.title ("{} {:0.6f} GHz spectrum".format(model,centerFrequency*1e-9), fontsize = 'medium')
    PLT. Show()

  • Nican.dll call python questions

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    # instantiate the table a
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    canAttrIdList [3] = c_ulong (0 x 80000014)
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    # Fill the values in the table
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    types import *.
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    import sys
    import of struct
    time of import

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    # HEADER INFORMATION RELEVANT C
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