Hello,

I am trying to access either of the serial port of Ebox2300 but IO Exception is raised at sp.Open(); line of the following program:

SerialPort sp = new SerialPort("COM1", 19200, Parity.None, 8, StopBits.One);
//SerialPort sp = new SerialPort("COM2", 19200, Parity.None, 8, StopBits.One); 
//The error is raised even if I change COM1 to COM2
if (sp.IsOpen)
{
sp.Close();
}
sp.Open(); // Here exception is raised.
sp.Close();