diff --git a/src/org/hwo/io/servicelink/RegisterEditor.java b/src/org/hwo/io/servicelink/RegisterEditor.java
index 7def0cf..2b0f8e6 100644
--- a/src/org/hwo/io/servicelink/RegisterEditor.java
+++ b/src/org/hwo/io/servicelink/RegisterEditor.java
@@ -174,7 +174,14 @@ public class RegisterEditor extends JFrame implements IInteractiveObjectEditor{
 	public void setInteractiveObject(Object o) {
 		serviceNodeRegister = (ServiceNodeRegister)o;
 		
-		serviceNodeRegister.read();
+		try
+		{
+			serviceNodeRegister.read();	
+		} catch (ServiceLinkRequestFailedException slex)
+		{
+			System.err.println("RegisterEditor: " + slex);
+		}
+		
 		
 		tfRegister.setText(serviceNodeRegister.register.toString());
 		lblLabel.setText(serviceNodeRegister.label);
diff --git a/src/org/hwo/io/servicelink/ServiceLink.java b/src/org/hwo/io/servicelink/ServiceLink.java
index f948692..bb51b07 100644
--- a/src/org/hwo/io/servicelink/ServiceLink.java
+++ b/src/org/hwo/io/servicelink/ServiceLink.java
@@ -45,12 +45,12 @@ public class ServiceLink {
 	static int SL_MAGIC = 0x66;
 	
 	
-	class ServiceTelegram
+	public class ServiceTelegram
 	{
-		byte request;
-		byte achse;
-		byte knoten;
-		int register;
+		private byte request;
+		private byte achse;
+		private byte knoten;
+		private int register;
 		byte[] value;
 		
 		public ServiceTelegram()
@@ -126,6 +126,38 @@ public class ServiceLink {
 				throw new ServiceLinkException(e);
 			}
 		}
+
+		public byte getRequest() {
+			return request;
+		}
+
+		public void setRequest(byte request) {
+			this.request = request;
+		}
+
+		public byte getAchse() {
+			return achse;
+		}
+
+		public void setAchse(byte achse) {
+			this.achse = achse;
+		}
+
+		public byte getKnoten() {
+			return knoten;
+		}
+
+		public void setKnoten(byte knoten) {
+			this.knoten = knoten;
+		}
+
+		public int getRegister() {
+			return register;
+		}
+
+		public void setRegister(int register) {
+			this.register = register;
+		}
 		
 	}
 		
@@ -194,17 +226,21 @@ public class ServiceLink {
 					intValue = new Integer(value);
 			}
 			
-			public void read()
+			public void read() throws ServiceLinkRequestFailedException
 			{
 				try {
 					if (floatType)
 						floatValue = ServiceNode.this.readFloat(register);
 					else
 						intValue = ServiceNode.this.readInt(register);
+				} catch (ServiceLinkRequestFailedException slex)
+				{
+					floatValue = null;
+					intValue = 0;
+					throw slex;
 				} catch (Exception e) {
 					floatValue = null;
 					intValue = 0;
-					e.printStackTrace();
 				};
 			}
 			
@@ -265,10 +301,19 @@ public class ServiceLink {
 			return registers;
 		}
 		
-		public void read()
+		public void read() throws ServiceLinkRequestFailedException
 		{
 			for (ServiceNodeRegister r:registers)
-				r.read();				
+			{
+				try
+				{
+					r.read();	
+				} catch (ServiceLinkRequestFailedException slex)
+				{
+					System.err.println("ServiceNode.read(): "+ slex);
+				}
+				
+			}
 		}
 		
 		public ServiceLink getServiceLink()
@@ -369,16 +414,8 @@ public class ServiceLink {
 	{
 		this.retries = 3;
 		this.serialPort = serialPort;
-		this.serialPort.setTimeout(500);
+		this.serialPort.setTimeout(100);
 		
-		try
-		{
-			System.err.println(String.format("BRKVAL : 0x%04x",readInt((byte)0,(byte)0,(short)0x200)));
-			System.err.println(String.format("SPLIMIT: 0x%04x",readInt((byte)0,(byte)0,(short)0x201)));
-		} catch (Exception e)
-		{
-			e.printStackTrace();
-		}
 	}
 	
 	public void open() throws ServiceLinkException
@@ -447,10 +484,10 @@ public class ServiceLink {
 	{
 		ServiceTelegram telegram = new ServiceTelegram();
 		
-		telegram.request = request;
-		telegram.achse = achse;
-		telegram.knoten = knoten;
-		telegram.register = register;
+		telegram.setRequest(request);
+		telegram.setAchse(achse);
+		telegram.setKnoten(knoten);
+		telegram.setRegister(register);
 		
 		if (value.length == 4)
 			telegram.value = value;
@@ -459,8 +496,8 @@ public class ServiceLink {
 		telegram.send();
 		telegram.recv();
 		
-		if ((telegram.request & REQ_ACK)==0)
-			throw new ServiceLinkRequestFailedException();
+		if ((telegram.getRequest() & REQ_ACK)==0)
+			throw new ServiceLinkRequestFailedException(telegram);
 		
 		return telegram;
 	}
diff --git a/src/org/hwo/io/servicelink/ServiceLinkRequestFailedException.java b/src/org/hwo/io/servicelink/ServiceLinkRequestFailedException.java
index 4727a14..88ac216 100644
--- a/src/org/hwo/io/servicelink/ServiceLinkRequestFailedException.java
+++ b/src/org/hwo/io/servicelink/ServiceLinkRequestFailedException.java
@@ -1,5 +1,30 @@
 package org.hwo.io.servicelink;
 
+import org.hwo.io.servicelink.ServiceLink.ServiceTelegram;
+
 public class ServiceLinkRequestFailedException extends ServiceLinkException {
 
+	private ServiceTelegram serviceTelegram;
+	
+	public ServiceLinkRequestFailedException(ServiceTelegram telegram)
+	{
+		serviceTelegram = telegram;
+	}
+	
+	public ServiceLinkRequestFailedException()
+	{
+		serviceTelegram = null;
+	}
+	
+	public ServiceTelegram getServiceTelegram()
+	{
+		return this.serviceTelegram;
+	}
+	
+	@Override
+	public String toString() {
+		if (getServiceTelegram()!=null)
+			return String.format("ServiceLinkRequestFailedException: %d.%d:%d",getServiceTelegram().getAchse(),getServiceTelegram().getKnoten(),getServiceTelegram().getRegister());
+		return "ServiceLinkRequestFailedException";
+	}
 }