VISA error = timeout expired before operation completed

  Hi

  I have been developing a simple C# WindowsForm program by VS2010 for Agilent E3634A Power Supply.

  I try to initialize driver here in Main function. I just get instance of the object and initialize the driver. With the button click, I want to open output and then read voltage. It gives me always "VISA error  = timeout expired before operation completed" error.

 I think I have to open a session and set all serial parameters same as instrument but I do not know how to open session by IVI COM. Any help? Thanks

  using Ivi.Driver.Interop;
  using Agilent.AgilentE36xx.Interop;

  string resourceDesc = "ASRL5::INSTR";      //RS232 COM=5        
      

          public MainForm()
        {
            InitializeComponent();
               
            try
            {
                driver = new AgilentE36xx();
                driver.Initialize(resourceDesc, idquery, reset, "DriverSetup= Model=E3634A,Trace=false");
                       
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);
            }
                      
        }

         private void button3_Click(object sender, EventArgs e)
        {
           
            driver.Outputs.Enabled = true;         
           

             // Get Output1 object.  get_Name(1) returns "Output1".
            IAgilentE36xxOutput pOutput1 = driver.Outputs.get_Item(driver.Outputs.get_Name(1));
           

             // Measure the output voltage
            measuredvolt = pOutput1.Measure(AgilentE36xxMeasurementTypeEnum.AgilentE36xxMeasurementVoltage);          

        }