SerialPort.DataReceived Event Execution Logic

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C#

.NET

WinForms

serial-port

Hey everyone.

I've a question to ask.

I'm wondering that the DataReceived event is automatically raised whenever a data comes from serialPort? I've read but couldn't find info here:

http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.datareceived.aspx[^]

I've written a little program to read data every 3 seconds from serial port, but that doesn't work quiet well.

The code is below:

string buffer;

SerialPort sp = new SerialPort("COM1");

sp.BaudRate = 9600;
sp.Handshake = Handshake.None;

// Handler
sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
    buffer= sp.ReadExisting();
}

I don't want to use Timer, because the data doesn't always arrive in 3 second intervals. So, I can't get precise datas.

I know this's a simple question, but I'm stuck...
Any idea how to read with intervals?
My best regards...