串口连接，Readline/ readeexisting不工作

我正在尝试与另一台机器进行串行连接。我正在使用虚拟串行端口模拟器来尝试这一点。我在超级终端上使用的设置如下所示。我可以看到portopen是true，但是我无法检查我是否可以写或读。当我尝试ReadLine方法时，它给出了TimeoutException，当它读取现有命令时，它什么也不做。DataReceived也不会被触发。你能帮我一下吗?

 private void Page1_Load(object sender, EventArgs e)
        {
        //Port name can be identified by checking the ports

        // section in Device Manager after connecting your device
        serialPort1.PortName = "COM14"; // that one works for me
        //Provide the name of port to which device is connected
        //default values of hardware[check with device specification document]
        serialPort1.BaudRate = 115200;
        serialPort1.Parity = Parity.None;
        serialPort1.DataBits = 8;
        serialPort1.StopBits = StopBits.One;
        serialPort1.Handshake = Handshake.None;
        serialPort1.RtsEnable = true;
        serialPort1.DtrEnable = true;
        serialPort1.ReceivedBytesThreshold = 8;
        serialPort1.ReadTimeout = 2000;
        serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);  //
        // Writes data to the Serial Port output buffer 
        //opens the port
        serialPort1.Open();
    }
      private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {

        inputData = serialPort1.ReadExisting();
        this.Invoke((MethodInvoker)delegate { DoUpdate(); });

    }
     public void DoUpdate()
    {
        textOutput.Text = (textOutput.Text + inputData);
    }
     private void btnReadExist_Click(object sender, EventArgs e)
    {
        if ((serialPort1.IsOpen == true))
        {

           serialPort1.WriteLine("something"); 
           string read= serialPort1.ReadExisting();
           //string output = serialPort1.ReadLine();
           textOutput.Text += read;
        }
    }

    private void Page1_FormClosed(object sender,System.Windows.Forms.FormClosedEventArgs e)
    {
        //  Close the Serial Port
          serialPort1.Close();
    }