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private void Serial_Received(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            //RxString = serialPort1.ReadLine();
            RxString = serialPort1.ReadByte();
            this.BeginInvoke(new EventHandler(DoUpdate));
            
                i++;
            
            if (i == 600)
            {
                this.Invalidate();
                    i = 0;
            }

        }
        private void DoUpdate(object s, EventArgs e)
        {
            Echo[i] = RxString;
        }
        protected override void OnPaint(PaintEventArgs e)
        {
// Daten in Echo[] zeichnen
        }