diff --git a/src/main/java/de/ctdo/bunti/dmx/DMX.java b/src/main/java/de/ctdo/bunti/dmx/DMX.java
index 5f72185..5f655b4 100644
--- a/src/main/java/de/ctdo/bunti/dmx/DMX.java
+++ b/src/main/java/de/ctdo/bunti/dmx/DMX.java
@@ -2,17 +2,11 @@ package de.ctdo.bunti.dmx;
 
 public final class DMX {
 
-    public static final int DMX_CHANNELS_MAX      = 511;
-    public static final int DMX_CHANNELS_MIN      = 0;
+    public static final int DMX_CHANNEL_INDEX_MAX = 512;
+    public static final int DMX_CHANNEL_INDEX_MIN = 1;
     public static final int DMX_CHANNEL_VALUE_MAX = 255;
     public static final int DMX_CHANNEL_VALUE_MIN = 0;
 
-    /**
-     * Offset by which startaddress differs from DMX512 Data Array location
-     */
-    public static final int DMX_STARTADDRESS_OFFSET = -1;
-
-
     private DMX() {
 
     }
@@ -20,7 +14,7 @@ public final class DMX {
     /**
      * Checks the DMX Value boundaries
      *
-     * @param value
+     * @param value the DMX channel value to sanitize
      * @return A valid DMX512 channel value
      */
     public static int sanitizeDMXValue(int value) {
@@ -40,7 +34,7 @@ public final class DMX {
      * @return True if channel is valid. Otherwise false.
      */
     public static boolean checkChannelBoundaries(int channel) {
-        return (channel >= DMX_CHANNELS_MIN && channel <= DMX_CHANNELS_MAX);
+        return (channel >= DMX_CHANNEL_INDEX_MIN && channel <= DMX_CHANNEL_INDEX_MAX);
     }
 
 
diff --git a/src/main/java/de/ctdo/bunti/dmx/DMXMixerImpl.java b/src/main/java/de/ctdo/bunti/dmx/DMXMixerImpl.java
index 90029e3..8526a2a 100644
--- a/src/main/java/de/ctdo/bunti/dmx/DMXMixerImpl.java
+++ b/src/main/java/de/ctdo/bunti/dmx/DMXMixerImpl.java
@@ -18,7 +18,7 @@ import java.util.Map;
 @Component
 
 public class DMXMixerImpl implements DMXMixer, ApplicationListener<DeviceChangedEvent> {
-    private static final Logger LOGGER                = LoggerFactory.getLogger(DMXMixerImpl.class);
+    private static final Logger LOGGER = LoggerFactory.getLogger(DMXMixerImpl.class);
     private String artNetDeviceAddress;
 
     private final Map<Integer, Integer> dmxMap = Collections.synchronizedMap(new HashMap<Integer, Integer>());
@@ -35,7 +35,7 @@ public class DMXMixerImpl implements DMXMixer, ApplicationListener<DeviceChanged
     }
 
     public final void initDMXData() {
-        for (int i = 0; i <= DMX.DMX_CHANNELS_MAX; i++) {
+        for (int i = 0; i <= DMX.DMX_CHANNEL_INDEX_MAX; i++) {
             dmxMap.put(i, 0);
         }
     }
diff --git a/src/main/java/de/ctdo/bunti/model/BuntiDMXDevice.java b/src/main/java/de/ctdo/bunti/model/BuntiDMXDevice.java
index 86a728d..dd9d216 100644
--- a/src/main/java/de/ctdo/bunti/model/BuntiDMXDevice.java
+++ b/src/main/java/de/ctdo/bunti/model/BuntiDMXDevice.java
@@ -15,7 +15,7 @@ public abstract class BuntiDMXDevice extends BuntiDevice {
 
     public BuntiDMXDevice(int deviceId, int startAddress, String name) {
         super(deviceId, name);
-        this.startAddress = startAddress;
+        setStartAddress(startAddress);
     }
 
     public final long getLastSendOut() {
@@ -30,8 +30,13 @@ public abstract class BuntiDMXDevice extends BuntiDevice {
         return startAddress;
     }
 
-    public final void setStartAddress(int startAddress) {
+    public final boolean setStartAddress(int startAddress) {
+        if(startAddress < DMX.DMX_CHANNEL_INDEX_MIN ||
+            startAddress - 1 + dmxChannels.getCount() > DMX.DMX_CHANNEL_INDEX_MAX) {
+            return false;
+        }
         this.startAddress = startAddress;
+        return true;
     }
 
     /**
@@ -73,11 +78,11 @@ public abstract class BuntiDMXDevice extends BuntiDevice {
         Map<Integer, Integer> map = new HashMap<Integer, Integer>();
 
         for (DMXChannel channel : dmxChannels.getAllChannels()) {
-            int index = channel.getOffset() + startAddress + DMX.DMX_STARTADDRESS_OFFSET;
+            int index = channel.getOffset() + startAddress;
 
-            if (index >= DMX.DMX_CHANNELS_MIN && index <= DMX.DMX_CHANNELS_MAX) {
+//            if (index >= DMX.DMX_CHANNEL_INDEX_MIN && index <= DMX.DMX_CHANNEL_INDEX_MAX) {
                 map.put(index, channel.getValue());
-            }
+//            }
         }
 
         return map;
diff --git a/src/test/java/de/ctdo/bunti/model/BuntiDMXDeviceTest.java b/src/test/java/de/ctdo/bunti/model/BuntiDMXDeviceTest.java
index 7906270..43fdcef 100644
--- a/src/test/java/de/ctdo/bunti/model/BuntiDMXDeviceTest.java
+++ b/src/test/java/de/ctdo/bunti/model/BuntiDMXDeviceTest.java
@@ -1,6 +1,5 @@
 package de.ctdo.bunti.model;
 
-import de.ctdo.bunti.dmx.DMX;
 import de.ctdo.bunti.dmx.DMXChannel;
 import org.junit.Before;
 import org.junit.Test;
@@ -47,6 +46,16 @@ public class BuntiDMXDeviceTest {
         assertEquals(333, dut.getStartAddress());
     }
 
+    @Test
+    public void testSetStartAddressWrong1() throws Exception {
+        assertFalse(dut.setStartAddress(0));
+    }
+
+    @Test
+    public void testSetStartAddressWrong2() throws Exception {
+        assertFalse(dut.setStartAddress(513));
+    }
+
 
     @Test
     public void testSetValuesFromOptions() throws Exception {
@@ -86,7 +95,7 @@ public class BuntiDMXDeviceTest {
 
     @Test
     public void testGetChannelValueWrong() throws Exception {
-        assertEquals(dut.getChannelValueByName("nonexistent"),0 );
+        assertEquals(dut.getChannelValueByName("nonexistent"), 0);
     }
 
     @Test
@@ -117,12 +126,19 @@ public class BuntiDMXDeviceTest {
 
         Map<Integer,Integer> channelData = dut.getChannelData();
 
-        assertEquals(new Integer(222), channelData.get(STARTADDRESS + 0 + DMX.DMX_STARTADDRESS_OFFSET));
-        assertEquals(new Integer(66),  channelData.get(STARTADDRESS + 1 + DMX.DMX_STARTADDRESS_OFFSET));
-        assertEquals(new Integer(77),  channelData.get(STARTADDRESS + 2 + DMX.DMX_STARTADDRESS_OFFSET));
-        assertEquals(new Integer(99),  channelData.get(STARTADDRESS + 3 + DMX.DMX_STARTADDRESS_OFFSET));
-        assertEquals(new Integer(111), channelData.get(STARTADDRESS + 4 + DMX.DMX_STARTADDRESS_OFFSET));
+        assertEquals(new Integer(222), channelData.get(STARTADDRESS));
+        assertEquals(new Integer(66),  channelData.get(STARTADDRESS + 1));
+        assertEquals(new Integer(77),  channelData.get(STARTADDRESS + 2));
+        assertEquals(new Integer(99),  channelData.get(STARTADDRESS + 3));
+        assertEquals(new Integer(111), channelData.get(STARTADDRESS + 4));
     }
+    
+//    @Test
+//    public void testGetChannelDataIndex() throws Exception {
+//        dut = new Par56Spot(42, -10, "faultdevice");
+//        dut.setChannelValueByName("red", 23);
+//        assertEquals(5, dut.getChannelData().size());
+//    }
 
     @Test
     public void testAddChannel() throws Exception {