Samples Being Overwritten

[yegua22]

I have been working on a program that has multiple inputs from multiple devices, and it seems I cannot get around the problem of my samples being overwritten.  I have tried all the suggestions I found on the board, but so far nothing is working.  Im sure im just missing something simple, but I thought I would come here for suggestions.

In this example I am using a NI9217 to read temperatures from 4 RTDs.

Task Creation

temperatureTask(1) = New Task()

temperatureTask(1).AIChannels.CreateRtdChannel(temp1Device.Text & "/ai0:" & temp1Channel.Items.Count - 1, "", _
	Convert.ToDouble(-40), Convert.ToDouble(65), _
        AITemperatureUnits.DegreesC, rtdType, resistanceConfiguration, excitationSource, _
        Convert.ToDouble(0.001), Convert.ToDouble(100))

	temperatureTask(1).Stream.ReadOverwriteMode = ReadOverwriteMode.OverwriteUnreadSamples

	temperatureTask(1).Timing.ConfigureSampleClock("", 100, _
		SampleClockActiveEdge.Rising, SampleQuantityMode.ContinuousSamples, 10000)
	
	temperatureTask(1).Control(TaskAction.Verify)
	
	temperatureReader(1) = New AnalogMultiChannelReader(temperatureTask(1).Stream)
	
	temperatureReader(1).SynchronizeCallbacks = True	
	temperatureReader(1).BeginReadWaveform(-1, temperature1Callback, temperatureTask(1))

Callback

Private Sub temperature1InCallBack(ByVal ar As IAsyncResult)
        Try
            temperatureData = temperatureReader(1).ReadSingleSample

            If temp1Monitor.Value = True Then

                temperature1.Value = (Math.Floor((10 ^ 2) * temperatureData.GetValue(CInt(temp1Channel.SelectedItem.ToString))) / (10 ^ 2))
                temp1Value.Text = temperature1.Value

            Else
                temp1Value.Text = "NA"
            End If

            If temp2Monitor.Value = True Then

                temperature2.Value = (Math.Floor((10 ^ 2) * temperatureData.GetValue(CInt(temp2Channel.SelectedItem.ToString))) / (10 ^ 2))
                temp2Value.Text = temperature2.Value

            Else
                temp2Value.Text = "NA"
            End If

            If temp3Monitor.Value = True Then

                temperature3.Value = (Math.Floor((10 ^ 2) * temperatureData.GetValue(CInt(temp3Channel.SelectedItem.ToString))) / (10 ^ 2))
                temp3Value.Text = temperature3.Value

           Else
                temp3Value.Text = "NA"
            End If

            If temp4Monitor.Value = True Then

                temperature4.Value = (Math.Floor((10 ^ 2) * temperatureData.GetValue(CInt(temp4Channel.SelectedItem.ToString))) / (10 ^ 2))
                temp4Value.Text = temperature4.Value

            Else
                temp4Value.Text = "NA"
            End If

            temperatureReader(1).BeginReadSingleSample(temperature1Callback, temperatureTask(1))
        Catch exception As DaqException
            MsgBox(exception.ToString)
        Catch ex As Exception
            MsgBox(ex.ToString)
        End Try
    End Sub

No matter what I try I seem to always get back to the error of samples being overwritten.  Any help would be greatly appreciated.

[yegua22]

Thread can be deleted, posted in wrong board.