how to waiting reply until 60 second in serial port c#

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i use this code to sent and receive the data in serial port, to sent the data no problem, but while receive respon the data more then 10 second, there will be an error because while string "sRecv = serialPort1.ReadExisting();" the data null, so how to waiting receive the data if first 10 second cannot receive the data.

C#

serialPort1.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
  public static string serialBuffer = "";
    static string expectedEcho = null;
    static object expectedEchoLock = new object();
    static ManualResetEvent expectedEchoReceived = new ManualResetEvent(false);

 private void SenContent()
{
SendCommand(sContent); //sent content to serial port
}

i use this code to sent and receive the data in serial port, to sent the data no problem, but while receive respon the data more then 10 second, there will be an error because while string "sRecv = serialPort1.ReadExisting();" the data null, so how to waiting receive the data if first 10 second cannot receive the data.

this just variable :

C#

  serialPort1.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
  public static string serialBuffer = "";
    static string expectedEcho = null;
    static object expectedEchoLock = new object();
    static ManualResetEvent expectedEchoReceived = new ManualResetEvent(false);

 private void SenContent()
{
SendCommand(sContent); //sent content to serial port
}

and this below function to sent Content :

C#

public bool SendCommand(string item)
    {
        lock (expectedEchoLock)
        {
            expectedEchoReceived.Reset();
            expectedEcho = item;
        }
        serialPort1.Write(item);
        Trace.Trace2(string.Format("sSend : {0}", item));
        return expectedEchoReceived.WaitOne(10000);
    }

and then this to receive data reply

C#

public void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
   {
        if (serialPort1.BytesToRead == 113) //i need only byte 113 so i use '==3'
       {
           sRecv = serialPort1.ReadExisting();
           serialPort1.Write(((char)6).ToString()); //sent ACK
       }

   }

Posted 20-Sep-15 5:11am

Member 11057420

Updated 20-Sep-15 5:37am

PIEBALDconsult

v2

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Ralf Meier 20-Sep-15 11:42am

Your Solution will block your application when "waiting" is required.
I won't do it like this.

I understood the following :
- You send data to the SerialPort.
- The Device which is connected to the SerialPort doesn't answer imidiatly - so you have to wait a while ...
- the answer is complete if 113 bytes are received ...?

Why don't you store the data on each DataReceived in a seperate String (append it on each Receive) and ask if the necessary number of bytes are in the string ?

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PIEBALDconsult · Answer 1 · 2015-09-20T05:58:00

I have found that performing the reads on a separate thread works quite well.
I do that whether I'm communicating over serial, socket, or stream.

Here's the Reader method for my SerialCommunicator:

C#

private void
Reader
(
    object Stream
)
{
    byte[] buffer = new byte [ this.port.ReadBufferSize ] ;

    PIEBALD.Types.StreamReader stream = new StreamReader
        ( (System.IO.Stream) Stream , buffer.Length ) ;

    while ( !this.abort )
    {
        int len = stream.Read ( buffer , 0 , buffer.Length ) ;

        if ( len > 0 )
        {
            this.RaiseDataReceived ( this.Encoding.GetString ( buffer , 0 , len ) ) ;
        }
        else
        {
            System.Threading.Thread.Sleep ( 100 ) ;
        }
    }

    return ;
}

After I open the port I spawn off the Reader thread:

C#

this.stream = this.port.BaseStream ;

this.reader = new System.Threading.Thread(this.Reader)
{
    Priority = System.Threading.ThreadPriority.BelowNormal
,
    IsBackground = true
} ;

this.reader.Start ( this.stream ) ;

I can't believe I still haven't finished writing my SerialCommunicator article... :mad: