Set BaudRate, Parity, ReadTimeout, StopBits for COM1 SerialPort

   



using System;
using System.IO.Ports;

class MainClass {
    static void Main(string[] args) {
        using (SerialPort port = new SerialPort("COM1")) {
            port.BaudRate = 9600;
            port.Parity = Parity.None;
            port.ReadTimeout = 10;
            port.StopBits = StopBits.One;

            port.Open();
            port.Write("Hello world!");

            Console.WriteLine("Wrote to the port.");
        }
    }
}