diff --git a/src/org/hwo/io/servicelink/AsynchronServiceLinkProvider.java b/src/org/hwo/io/servicelink/AsynchronServiceLinkProvider.java
new file mode 100644
index 0000000..8522e57
--- /dev/null
+++ b/src/org/hwo/io/servicelink/AsynchronServiceLinkProvider.java
@@ -0,0 +1,40 @@
+package org.hwo.io.servicelink;
+
+import java.util.Hashtable;
+import java.util.LinkedList;
+import java.util.List;
+
+public class AsynchronServiceLinkProvider {
+
+	ServiceRegisterCache cache;
+	Hashtable<Integer, List<ServiceRegisterListener>> serviceRegisterListeners;
+	
+	public AsynchronServiceLinkProvider(ServiceRegisterCache cache){
+		this.cache = cache;
+	}
+	
+	private Integer calcRegisterHash(int ax,int node,int registerno){	
+		Integer hash = (ax << 24) | (node << 16) | registerno;
+		return hash;
+	}
+	
+	private List<ServiceRegisterListener> getListeners(Integer hash){
+		if (!serviceRegisterListeners.containsKey(hash))
+			serviceRegisterListeners.put(hash, new LinkedList<ServiceRegisterListener>());
+		
+		return serviceRegisterListeners.get(hash);
+	}
+	
+	public void addServiceRegisterListener(int ax,int node,int registerno,ServiceRegisterListener listener){
+		getListeners(calcRegisterHash(ax, node, registerno)).add(listener);
+	}
+	public void removeServiceRegisterListener(int ax,int node,int registerno,ServiceRegisterListener listener){
+		getListeners(calcRegisterHash(ax, node, registerno)).remove(listener);		
+	}
+	
+	public void update(){
+		/* TODO: Implementieren des Update Zyklus */
+	}
+	
+	
+}
diff --git a/src/org/hwo/io/servicelink/ServiceRegisterListener.java b/src/org/hwo/io/servicelink/ServiceRegisterListener.java
new file mode 100644
index 0000000..0d8d146
--- /dev/null
+++ b/src/org/hwo/io/servicelink/ServiceRegisterListener.java
@@ -0,0 +1,8 @@
+package org.hwo.io.servicelink;
+
+public interface ServiceRegisterListener {
+	
+	void ServiceRegisterValueUpdated(int ax,int node,int registervalue,Integer value);
+	void ServiceRegisterValueUpdated(int ax,int node,int registervalue,Float value);
+
+}