Ansteuerung des Medion MD 8800 Display

Hi, ich habe durch zufall herausgefunden, dass das Medion Display über die serielle Schnittstelle (bei mir COM2) angsteuert wird.
Das Display ist aber 2-zeilig, und da weiß ich nicht, wie ich die 2. Zeile hinbekomme!
Kann mir da jemand helfen?

Der Text sieht so aus:
*****************************

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;

namespace Serial_1
{
public partial class Form1 : Form
{
public const byte CR = 13;
public const byte LF = 10;
public static string s1;
public int selIndex = 0;
public static SerialPort serialPort1;
public static Thread mytrhead;






public Form1()
{


InitializeComponent();
mytrhead = new Thread(ThreadProc);
serialPort1 = new SerialPort("COM2", 9600, Parity.None, 8, StopBits.One);

//

if (serialPort1.IsOpen == false)
serialPort1.Open();
else
{
lblStatus.Text = (serialPort1.PortName + " is busy!");

}

mytrhead.Start();
lblStatus.Text = " Press Button for Exit !";


}

private void Form1_Load(object sender, EventArgs e)
{

}

static void ThreadProc()
{
serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
while (true)
{


// serialPort1.WriteLine(" ");

// Thread.Sleep(5000);


}

}

static void serialPort1_DataReceived(Object o, SerialDataReceivedEventArgs e)
{
s1= serialPort1.ReadLine();


}

private void txtReceive_TextChanged(object sender, EventArgs e)
{
txtReceive.Text = txtReceive + s1;
}

private void btnExit_Click(object sender, EventArgs e)
{
mytrhead.Abort();
serialPort1.Close();
}

private void btnSend_Click(object sender, EventArgs e)
{
string text;
text = txtSend.Text;
serialPort1.WriteLine(text );


}

private void btnClrSend_Click(object sender, EventArgs e)
{
txtSend.Text = " ";

}

private void txtSend_TextChanged(object sender, EventArgs e)
{

}

private void btnPut_Click(object sender, EventArgs e)
{

//lstSend.Items.Add(txtSend.Text);



}



}
}