diff --git a/src/knx/group_object.cpp b/src/knx/group_object.cpp
index e1b9ef7..724f42b 100644
--- a/src/knx/group_object.cpp
+++ b/src/knx/group_object.cpp
@@ -154,23 +154,6 @@ void GroupObject::commFlag(ComFlag value)
     _commFlag = value;
 }
 
-int32_t GroupObject::objectReadFloatDpt9()
-{
-    uint16_t dptValue = getWord(_data);
-    return dptFromFloat(dptValue);
-}
-
-bool GroupObject::objectReadBool()
-{
-    return _data[0] > 0;
-}
-
-uint8_t GroupObject::objectReadByte()
-
-{
-  return _data[0];
-}
-
 void GroupObject::requestObjectRead()
 {
     _commFlag = ReadRequest;
@@ -181,22 +164,6 @@ void GroupObject::objectWritten()
     _commFlag = WriteRequest;
 }
 
-
-void GroupObject::objectWriteFloatDpt9(int32_t value)
-{
-    uint16_t dptValue = dptToFloat(value);
-    pushWord(dptValue, _data);
-    objectWritten();
-}
-
-
-void GroupObject::objectUpdateFloatDpt9(int32_t value)
-{
-    uint16_t dptValue = dptToFloat(value);
-    pushWord(dptValue, _data);
-    _commFlag = cfUpdate;
-}
-
 size_t GroupObject::valueSize()
 {
     return _dataLength;
@@ -208,59 +175,6 @@ size_t GroupObject::sizeInTelegram()
     return asapValueSize(code);
 }
 
-
-void GroupObject::objectWrite(bool value)
-{
-    objectWrite((uint8_t)value);
-}
-
-
-void GroupObject::objectWrite(uint8_t value)
-{
-    pushByte(value, _data);
-    objectWritten();
-}
-
-
-void GroupObject::objectWrite(uint16_t value)
-{
-    pushWord(value, _data);
-    objectWritten();
-}
-
-
-void GroupObject::objectWrite(uint32_t value)
-{
-    pushInt(value, _data);
-    objectWritten();
-}
-
-
-void GroupObject::objectWrite(int8_t value)
-{
-    objectWrite((uint8_t)value);
-}
-
-
-void GroupObject::objectWrite(int16_t value)
-{
-    objectWrite((uint16_t)value);
-}
-
-
-void GroupObject::objectWrite(int32_t value)
-{
-    objectWrite((uint32_t)value);
-}
-
-
-void GroupObject::objectWrite(float value)
-{
-    uint32_t tmp = value * 100;
-    objectWriteFloatDpt9(tmp);
-}
-
-
 void GroupObject::callback(GroupObjectUpdatedHandler handler)
 {
     _updateHandler = handler;
diff --git a/src/knx/group_object.h b/src/knx/group_object.h
index 4734ddc..0943e62 100644
--- a/src/knx/group_object.h
+++ b/src/knx/group_object.h
@@ -46,25 +46,12 @@ public:
     ComFlag commFlag();
     void commFlag(ComFlag value);
 
-    /**
-    * Get the float value from a communication object. Can be used for
-    * communication objects of type 2 uint8_t float (EIS5 / DPT9). The value is in
-    * 1/100 - a DPT9 value of 21.01 is returned as 2101.
-    *
-    * @return The value of the com-object in 1/100. INVALID_DPT_FLOAT is returned
-    *         for the DPT9 "invalid data" value.
-    */
-    int32_t objectReadFloatDpt9();
-    bool objectReadBool();
-    uint8_t objectReadByte();
     /**
     * Request the read of a communication object. Calling this function triggers the
     * sending of a read-group-value telegram, to read the value of the communication
     * object from the bus.
     *
     * When the answer is received, the communication object's value will be updated.
-    * You can cycle through all updated communication objects with nextUpdatedObject().
-    *
     *
     * @see objectWritten()
     */
@@ -78,40 +65,6 @@ public:
     */
     void objectWritten();
 
-    /**
-    * Set the value of a communication object. Calling this function triggers the
-    * sending of a write-group-value telegram.
-    *
-    * The communication object is a 2 uint8_t float (EIS5 / DPT9) object. The value is
-    * in 1/100, so a value of 2101 would set a DPT9 float value of 21.01. The valid
-    * range of the values is -671088.64 to 670760.96.
-    *
-    * @param value - the new value of the communication object in 1/100.
-    *                Use INVALID_DPT_FLOAT for the DPT9 "invalid data" value.
-    */
-    void objectWriteFloatDpt9(int32_t value);
-    void objectWrite(bool value);
-    void objectWrite(uint8_t value);
-    void objectWrite(uint16_t value);
-    void objectWrite(uint32_t value);
-    void objectWrite(int8_t value);
-    void objectWrite(int16_t value);
-    void objectWrite(int32_t value);
-    void objectWrite(float value);
-
-    /**
-    * Set the value of a communication object and mark the communication object
-    * as updated. This does not trigger a write-group-value telegram.
-    *
-    * The communication object is a 2 uint8_t float (EIS5 / DPT9) object. The value
-    * is in 1/100, so a value of 2101 would set a DPT9 float value of 21.01.
-    * The possible range of the values is -671088.64 to 670760.96.
-    *
-    * @param value - the new value of the communication object in 1/100.
-    *                Use INVALID_DPT_FLOAT for the DPT9 "invalid data" value.
-    */
-    void objectUpdateFloatDpt9(int32_t value);
-
     size_t valueSize();
     size_t asapValueSize(uint8_t code);
     size_t sizeInTelegram();