请教 vs2010 C# + axMSComm 开发串口问题

Question

         private byte[] datas=new byte[4] ;
        private string output;
        private int distance;
    private void axMSComm1_OnComm(object sender, EventArgs e)
        {
            datas=(byte[])this.axMSComm1.Input;
            output = datas[1].ToString() + datas[2].ToString();
            distance = Convert.ToInt32(output);
            textBox1.Text = distance.ToString() + " 毫米 ";
            textBox2.Text = DateTime.Now.ToString();
        }       
        private void Form1_Load(object sender, EventArgs e)
        {
            axMSComm1.CommPort = 2;
            axMSComm1.Settings = "9600,n,8,1";
            axMSComm1.InputMode = MSCommLib.InputModeConstants.comInputModeBinary;
            axMSComm1.PortOpen = true;   
        }
我第一次做串口方面的开发 这段程序接受不到串口数据 请问是什么原因

Answer 1

OnComm事件需要设置ReceivedBytesThreshold属性