What can cause the following exception: Exceptions.ESerialPortCannotOpen

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VB

WPF

Regards,

I've been trying to download the data stored in a measuring instrument. I have a DLL Library that contains all the methods that need to connect with the instrument.

I could to connect to the instrument, I can also do some configurations and also to recover the last data recorded by the instrument.

I Use a method that is in the DLLLibrary to determine if the port is open. i have suces to connecting my programa with the instrument but when I try to download the stored data,I get the following exception:

A first chance exception of type 'JPL.Systeme.Communication.SRadioFrec.Spyd.Core.Exceptions.ESerialPortCannotOpen' occurred in JplInstrument2Core.dll




Now,

My DLL Library is:JplInstrument2Core.dll

The instrument is: SRadioFrec



The instrumento is: SRadioFrec


Someone can help me to understand this exception and eventually fix it.
Here is the code to see if there is a problem:

Private Sub ButtonDescargaMedidas_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles ButtonDescargaMedidas.Click

      Try


          numeroSerieInstrum = TextBoxAdresse.Text

          CaptorSonda = typeSonde + TextBoxAdresse.Text

          spycom.PortOpen()

          If spycom.PortOpened =  True Then


              SpyModem.DownloadSatelliteMeasurements(CaptorSonda, Data1, Data2)


              For Each itemData1 As Byte  In Data1

                  itemData1.ToString()

                  MsgBox(itemData1)

              Next


              For Each itemData2 As Byte  In Data2

                  itemData2.ToString()

                  MsgBox(itemData2)

              Next

          Else

              MsgBox("port?")

          End If

      Catch ex As Exception

          MsgBox("problem")

      End Try



  End Sub

Finally, by placing a breakpoint in the code, I get that:

CaptorSonda returns the ID of the instrument=ok

Data1 = Nothing

Data2 = Nothing

I want to retrieve the data stored in Data1 and Data2. I am sure that Data1 and Data2 have something but i can't undesrtand why they dosen't appears.

I get that :

Exceptions.ESerialPortCannotOpen '


I appreciate your help.

thanks