diff --git a/mcdp/src/ch/ntb/mcdp/uart/Uart.java b/mcdp/src/ch/ntb/mcdp/uart/Uart.java
index 4f6159d..9c181f6 100644
--- a/mcdp/src/ch/ntb/mcdp/uart/Uart.java
+++ b/mcdp/src/ch/ntb/mcdp/uart/Uart.java
@@ -2,7 +2,6 @@ package ch.ntb.mcdp.uart;
 
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.util.LinkedList;
 
 public abstract class Uart {
 
@@ -10,10 +9,12 @@ public abstract class Uart {
 
 	UartInputStream in;
 
-	Uart(LinkedList<Uart> list) {
-		list.add(this);
+	Uart() {
+		UartDispatch.getUartList().add(this);
 		out = new UartOutputStream(getSTYPE_IN());
 		in = new UartInputStream();
+		// if the read-Thread is already started, this statement has no effect
+		UartDispatch.start();
 	}
 
 	/**
@@ -21,7 +22,7 @@ public abstract class Uart {
 	 * 
 	 * @return OutputStream to write to target device
 	 */
-	OutputStream getOutputStream() {
+	public OutputStream getOutputStream() {
 		return out;
 	}
 
@@ -30,13 +31,13 @@ public abstract class Uart {
 	 * 
 	 * @return InputStream to read from target device
 	 */
-	InputStream getInputStream() {
+	public InputStream getInputStream() {
 		return in;
 	}
 
 	/**
 	 * The packet subtype specified for this UART packet (from target to PC).
-	 * <br>
+	 * This constant is defined in <code>Dispatch.h</code>.<br>
 	 * Note: This direction is different from the input/output direction of the
 	 * streams.
 	 * 
@@ -46,7 +47,7 @@ public abstract class Uart {
 
 	/**
 	 * The packet subtype specified for this UART packet (from PC to target).
-	 * <br>
+	 * This constant is defined in <code>Dispatch.h</code>.<br>
 	 * Note: This direction is different from the input/output direction of the
 	 * streams.
 	 * 
diff --git a/mcdp/src/ch/ntb/mcdp/uart/Uart0.java b/mcdp/src/ch/ntb/mcdp/uart/Uart0.java
index 38cc7cf..a51c0e5 100644
--- a/mcdp/src/ch/ntb/mcdp/uart/Uart0.java
+++ b/mcdp/src/ch/ntb/mcdp/uart/Uart0.java
@@ -1,13 +1,8 @@
 package ch.ntb.mcdp.uart;
 
-import java.util.LinkedList;
 
 public class Uart0 extends Uart {
 	
-	Uart0(LinkedList<Uart> list) {
-		super(list);
-	}
-
 	// UART 0 Subtypes
 	/**
 	 * Data to UART 0
@@ -20,12 +15,12 @@ public class Uart0 extends Uart {
 	private static final byte STYPE_UART_0_OUT = 0x22;
 
 	@Override
-	byte getSTYPE_IN() {
-		return STYPE_UART_0_IN;
+	protected byte getSTYPE_OUT() {
+		return STYPE_UART_0_OUT;
 	}
 
 	@Override
-	byte getSTYPE_OUT() {
-		return STYPE_UART_0_OUT;
+	protected byte getSTYPE_IN() {
+		return STYPE_UART_0_IN;
 	}
 }
diff --git a/mcdp/src/ch/ntb/mcdp/uart/UartDispatch.java b/mcdp/src/ch/ntb/mcdp/uart/UartDispatch.java
index 52d85c7..791765c 100644
--- a/mcdp/src/ch/ntb/mcdp/uart/UartDispatch.java
+++ b/mcdp/src/ch/ntb/mcdp/uart/UartDispatch.java
@@ -1,19 +1,22 @@
 package ch.ntb.mcdp.uart;
 
+import java.util.Iterator;
 import java.util.LinkedList;
 
 import ch.ntb.mcdp.usb.DataPacket;
 import ch.ntb.mcdp.usb.Dispatch;
 import ch.ntb.mcdp.usb.DispatchException;
 import ch.ntb.mcdp.usb.USBDevice;
-import ch.ntb.usb.USB;
 import ch.ntb.usb.USBException;
 import ch.ntb.usb.USBTimeoutException;
 
 public class UartDispatch {
 
-	public static final int MAX_UART_PAYLOAD = USB.MAX_DATA_SIZE
-			- DataPacket.PACKET_MIN_LENGTH;
+	/**
+	 * Maximal number of bytes allowed as UART payload. This value is specified
+	 * in <code>UART_INBUF_LEN</code> in the file <code>uart.h</code>.
+	 */
+	public static final int MAX_UART_PAYLOAD = 128;
 
 	private static boolean running = false;
 
@@ -21,6 +24,10 @@ public class UartDispatch {
 
 	static LinkedList<Uart> uarts = new LinkedList<Uart>();
 
+	/**
+	 * Starts the read thread for all Uarts. If the thread is already running,
+	 * no action is taken.
+	 */
 	public static void start() {
 		if (dispatchThread == null) {
 			dispatchThread = new Thread() {
@@ -31,49 +38,99 @@ public class UartDispatch {
 						try {
 							data = Dispatch.readUART();
 							if (data != null) {
-								while (uarts.iterator().hasNext()) {
-									Uart obj = uarts.iterator().next();
-									if (obj.getSTYPE_OUT() == data.subtype) {
-										obj.in.bufferList.add(data);
+								Iterator iterator = uarts.iterator();
+								while (iterator.hasNext()) {
+									Uart uartObj = (Uart) iterator.next();
+									if (uartObj.getSTYPE_OUT() == data.subtype) {
+										uartObj.in.bufferList.add(data);
 									}
 								}
 							}
+							// TODO: remove
+							sleep(200);
 						} catch (USBTimeoutException e) {
 							// ignore TimeoutExceptions
 						} catch (USBException e) {
 							// TODO: Exceptionhandling
 							e.printStackTrace();
+							try {
+								sleep(2000);
+							} catch (InterruptedException e1) {
+								e1.printStackTrace();
+							}
 						} catch (DispatchException e) {
 							// TODO: Exceptionhandling
 							e.printStackTrace();
+							try {
+								sleep(2000);
+							} catch (InterruptedException e1) {
+								e1.printStackTrace();
+							}
+						} catch (InterruptedException e) {
+							// TODO Exceptionhandling
+							e.printStackTrace();
 						}
 					}
 				}
 			};
-		} else {
+		}
+		if (!running) {
 			running = true;
 			dispatchThread.start();
 		}
 	}
 
+	/**
+	 * Stops the Uart read-Thread.
+	 */
 	public static void stop() {
 		running = false;
 	}
 
-	public LinkedList<Uart> getUartList() {
+	/**
+	 * Check whether the read-Thread is still running.
+	 * 
+	 * @return state of the read-Thread
+	 */
+	public static boolean isRunning() {
+		return running;
+	}
+
+	/**
+	 * Get the LinkedList which contains all Uart-objects.
+	 * 
+	 * @return The LinkedList containing all Uart-objects.
+	 */
+	public static LinkedList<Uart> getUartList() {
 		return uarts;
 	}
 
-	public static void write(byte packetSubType, byte[] data, int len)
+	/**
+	 * Write a Uart data-packet to the target. The maximal number of bytes is
+	 * specified by <code>MAX_UART_PAYLOAD</code>. If more data is sent in
+	 * one packet, only <code>MAX_UART_PAYLOAD</code> bytes are forwarded to
+	 * the uart.
+	 * 
+	 * @param packetSubType
+	 *            The Subtype specified in <code>Dispatch.h</code>.
+	 * @param data
+	 *            The data to be sent.
+	 * @param len
+	 *            Length of the data to be sent.
+	 * @throws USBException
+	 */
+	protected static void write(byte packetSubType, byte[] data, int len)
 			throws USBException {
 		byte[] usbData = new byte[len + DataPacket.PACKET_MIN_LENGTH];
 		usbData[0] = DataPacket.PACKET_HEADER;
 		usbData[1] = Dispatch.MTYPE_UART;
 		usbData[2] = packetSubType;
+		usbData[3] = (byte) (len / 0x100);
+		usbData[4] = (byte) (len & 0xFF);
 		for (int i = 0; i < len; i++) {
 			usbData[DataPacket.PACKET_DATA_OFFSET + i] = data[i];
 		}
 		usbData[DataPacket.PACKET_DATA_OFFSET + len] = DataPacket.PACKET_END;
-		USBDevice.write_UART(data, len);
+		USBDevice.write_BDI(usbData, usbData.length);
 	}
 }
diff --git a/mcdp/src/ch/ntb/mcdp/uart/UartOutputStream.java b/mcdp/src/ch/ntb/mcdp/uart/UartOutputStream.java
index 562ed6d..a83667b 100644
--- a/mcdp/src/ch/ntb/mcdp/uart/UartOutputStream.java
+++ b/mcdp/src/ch/ntb/mcdp/uart/UartOutputStream.java
@@ -16,6 +16,7 @@ public class UartOutputStream extends OutputStream {
 	@Override
 	public void write(int b) throws IOException {
 		byte[] data = new byte[1];
+		data[0] = (byte) b;
 		try {
 			UartDispatch.write(packetSubType, data, 1);
 		} catch (USBException e) {
diff --git a/mcdp/src/ch/ntb/mcdp/uart/test/UartTest.java b/mcdp/src/ch/ntb/mcdp/uart/test/UartTest.java
new file mode 100644
index 0000000..3fe9b3c
--- /dev/null
+++ b/mcdp/src/ch/ntb/mcdp/uart/test/UartTest.java
@@ -0,0 +1,115 @@
+package ch.ntb.mcdp.uart.test;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import ch.ntb.mcdp.uart.Uart0;
+import ch.ntb.mcdp.uart.UartDispatch;
+
+public class UartTest {
+
+	static Thread reader;
+
+	static OutputStream out;
+
+	static InputStream in;
+
+	static byte[] buffer = new byte[UartDispatch.MAX_UART_PAYLOAD];
+
+	public static void init() {
+
+		// create an uart object
+		Uart0 uart = new Uart0();
+		// get the streams
+		out = uart.getOutputStream();
+		in = uart.getInputStream();
+
+		reader = new Thread() {
+			public void run() {
+				int readLen = 0;
+				while (true) {
+					try {
+						readLen = in.read(buffer);
+						if (readLen > 0) {
+							for (int i = 0; i < readLen; i++) {
+								System.out.print((char) buffer[i]);
+							}
+						}
+					} catch (IOException e) {
+						e.printStackTrace();
+					}
+				}
+			}
+		};
+		reader.start();
+	}
+
+	static public void button1() {
+		byte[] buffer = new byte[UartDispatch.MAX_UART_PAYLOAD];
+		for (int i = 0; i < buffer.length; i++) {
+			buffer[i] = (byte) ('0' + (i % ('z' - '0')));
+		}
+		try {
+			out.write(buffer);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+	static public void button2() {
+
+	}
+
+	static public void button3() {
+
+	}
+
+	static public void button4() {
+
+	}
+
+	static public void button5() {
+
+	}
+
+	static public void button6() {
+
+	}
+
+	static public void button7() {
+
+	}
+
+	static public void button8() {
+
+	}
+
+	static public void button9() {
+
+	}
+
+	static public void button10() {
+
+	}
+
+	static public void button11() {
+
+	}
+
+	static public void button12() {
+
+	}
+
+	static public void button13() {
+
+	}
+
+	static public void button14() {
+
+	}
+
+	static public void button15() {
+
+	}
+}
diff --git a/mcdp/src/ch/ntb/mcdp/uart/test/UartTestApp.java b/mcdp/src/ch/ntb/mcdp/uart/test/UartTestApp.java
new file mode 100644
index 0000000..c8cc744
--- /dev/null
+++ b/mcdp/src/ch/ntb/mcdp/uart/test/UartTestApp.java
@@ -0,0 +1,216 @@
+package ch.ntb.mcdp.uart.test;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.RowLayout;
+import org.eclipse.swt.widgets.Button;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Shell;
+
+import ch.ntb.mcdp.uart.UartDispatch;
+import ch.ntb.mcdp.usb.USBDevice;
+import ch.ntb.usb.USBException;
+
+public class UartTestApp {
+
+	private Shell sShell = null; // @jve:decl-index=0:visual-constraint="10,10"
+
+	private Button button1 = null;
+
+	private Button button2 = null;
+
+	private Button button3 = null;
+
+	private Button button4 = null;
+
+	private Button button5 = null;
+
+	private Button button6 = null;
+
+	private Button button7 = null;
+
+	private Button button8 = null;
+
+	private Button button9 = null;
+
+	private Button button10 = null;
+
+	private Button button15 = null;
+
+	private Button button11 = null;
+
+	private Button button12 = null;
+
+	private Button button13 = null;
+
+	private Button button14 = null;
+
+	/**
+	 * This method initializes sShell
+	 */
+	private void createSShell() {
+		sShell = new Shell();
+		sShell.setText("Shell");
+		sShell.setLayout(new RowLayout());
+		sShell.setSize(new org.eclipse.swt.graphics.Point(312,110));
+		button1 = new Button(sShell, SWT.NONE);
+		button1.setText("writeData");
+		button1
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button1();
+					}
+				});
+		button2 = new Button(sShell, SWT.NONE);
+		button2.setText("not assigned");
+		button2
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button2();
+					}
+				});
+		button3 = new Button(sShell, SWT.NONE);
+		button3.setText("not assigned");
+		button3
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button3();
+					}
+				});
+		button4 = new Button(sShell, SWT.NONE);
+		button4.setText("not assigned");
+		button4
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button4();
+					}
+				});
+		button5 = new Button(sShell, SWT.NONE);
+		button5.setText("not assigned");
+		button6 = new Button(sShell, SWT.NONE);
+		button6.setText("not assigned");
+		button6
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button6();
+					}
+				});
+		button7 = new Button(sShell, SWT.NONE);
+		button7.setText("not assigned");
+		button8 = new Button(sShell, SWT.NONE);
+		button8.setText("not assigned");
+		button8
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button8();
+					}
+				});
+		button9 = new Button(sShell, SWT.NONE);
+		button9.setText("not assigned");
+		button10 = new Button(sShell, SWT.NONE);
+		button10.setText("not assigned");
+		button11 = new Button(sShell, SWT.NONE);
+		button11.setText("not assigned");
+		button11.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+			public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
+				UartTest.button11();
+			}
+		});
+		button12 = new Button(sShell, SWT.NONE);
+		button12.setText("not assigned");
+		button12.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+			public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
+				UartTest.button12();
+			}
+		});
+		button13 = new Button(sShell, SWT.NONE);
+		button13.setText("not assigned");
+		button13.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+			public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
+				UartTest.button13();
+			}
+		});
+		button14 = new Button(sShell, SWT.NONE);
+		button14.setText("not assigned");
+		button14.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+			public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
+				UartTest.button14();
+			}
+		});
+		button15 = new Button(sShell, SWT.NONE);
+		button15.setText("not assigned");
+		button15.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+			public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
+				UartTest.button15();
+			}
+		});
+		button10
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button10();
+					}
+				});
+		button9
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button9();
+					}
+				});
+		button7
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button7();
+					}
+				});
+		button5
+				.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
+					public void widgetSelected(
+							org.eclipse.swt.events.SelectionEvent e) {
+						UartTest.button5();
+					}
+				});
+	}
+
+	public static void main(String[] args) {
+		UartTestApp app = new UartTestApp();
+		app.createSShell();
+		app.sShell.open();
+
+		Display display = app.sShell.getDisplay();
+
+		try {
+			USBDevice.open();
+			System.out.println("open device...");
+		} catch (USBException e) {
+			e.printStackTrace();
+			return;
+		}
+		UartDispatch.start();
+		UartTest.init();
+
+		while (!app.sShell.isDisposed()) {
+			if (!display.readAndDispatch()) {
+				display.sleep();
+			}
+		}
+		
+		UartDispatch.stop();
+
+		try {
+			USBDevice.close();
+			System.out.println("closing device...");
+		} catch (USBException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+		System.exit(0);
+	}
+}