diff --git a/bc.h b/bc.h
index 3b92bc3..0ada14a 100644
--- a/bc.h
+++ b/bc.h
@@ -49,6 +49,7 @@ public:
 
   BCException( const QString& what, const QString& param="" );
   BCException( const QString& what, int errCode );
+
 };
 
 namespace bc
diff --git a/bccandrivertinycan.cpp b/bccandrivertinycan.cpp
index 8a4b137..7105250 100644
--- a/bccandrivertinycan.cpp
+++ b/bccandrivertinycan.cpp
@@ -29,12 +29,12 @@ BCCanDriver::DriverState BCCanDriverTinyCan::loadDriver()
   struct ::TDeviceStatus status;
 
   if( ::LoadDriver( NULL ) < 0 )
-    throw std::runtime_error( "Driver Error: 'LoadDriver'" );
+    throw BCException( "Driver Error: 'LoadDriver'" );
 
    setState(BCCanDriver::DriverState::Loaded);
 
   if( ::CanInitDriver( NULL ) < 0 )
-    throw std::runtime_error( "Driver Error: 'InitDriver'" );  
+    throw BCException( "Driver Error: 'InitDriver'" );
 
   if( ::CanDeviceOpen( 0, NULL ) < 0 )
     throw  std::runtime_error( "Driver Error: 'DeviceOpen'" );
@@ -46,12 +46,12 @@ BCCanDriver::DriverState BCCanDriverTinyCan::loadDriver()
   setState(BCCanDriver::DriverState::Initialized);
 
   if( status.DrvStatus < DRV_STATUS_CAN_OPEN )
-    throw std::runtime_error( "Driver Error: could not open device." );
+    throw BCException( "Driver Error: could not open device." );
 
   if( status.CanStatus == CAN_STATUS_BUS_OFF )
   {
     ::CanSetMode( 0, OP_CAN_RESET, CAN_CMD_NONE );
-    throw std::runtime_error( "Driver Error: CAN Status 'BusOff'" );
+    throw BCException( "Driver Error: CAN Status 'BusOff'" );
   }
 
   setState(BCCanDriver::DriverState::Ready);
@@ -74,7 +74,7 @@ BCCanDriver::DriverState BCCanDriverTinyCan::loadDriver()
         ::UnloadDriver();
 
         // re-throw
-        throw std::runtime_error( except.what() );
+        throw BCException( except.what() );
     }
     */
 
@@ -156,14 +156,14 @@ retry:
     bc::delay_millis( cTIMEOUT_MS );
 
   if( timeOuts == -1 )
-    throw std::runtime_error( "getValue error: no response from node" );
+    throw BCException( "getValue error: no response from node" );
 
   // message empfangen
   int err = ::CanReceive( 0, &msg, 1 );
   qDebug() << "HÄÄ ?" << err << "reg: "<< reg <<"  timeOuts: " << timeOuts;
 
   if( err < 0 )
-    //throw std::runtime_error( "getValue error: could not receive value" );
+    //throw BCException( "getValue error: could not receive value" );
     qDebug( "getValue error: could not receive value" );
 
   qDebug() << "HÄÄ 2" <<msg.Id;
@@ -175,7 +175,7 @@ retry:
     goto retry;
 
   if( !timeOuts )
-    throw std::runtime_error( "CAN --response errror" );
+    throw BCException( "CAN --response errror" );
 
   return (bcdata_t) msg.MsgData[3];
 
diff --git a/bctransmitter.cpp b/bctransmitter.cpp
index f2df86f..af3b994 100644
--- a/bctransmitter.cpp
+++ b/bctransmitter.cpp
@@ -108,12 +108,28 @@ void BCTransmitter::processValueOp( BC::OpID opID )
 
 bcdata_t BCTransmitter::readRawValue( BCDevice::ID deviceID, BC::ID registerID ) const
 {
-  return _canDriver.readRawValue( deviceID, registerID );
+  try
+  {
+    return _canDriver.readRawValue( deviceID, registerID );
+  }
+  catch ( BCException& exception )
+  {
+     qDebug() << " -- OUCH: read exception: " << exception.what();
+  }
+
 }
 
 void BCTransmitter::writeRawValue( BCDevice::ID deviceID, BC::ID registerID, bcdata_t value ) const
 {
+  try
+  {
   _canDriver.writeRawValue( deviceID, registerID, value );
+  }
+  catch ( BCException& exception )
+  {
+    qDebug() << " -- OUCH: write exception: " << exception.what();
+  }
+
 }
 
 
diff --git a/bctransmitter.h b/bctransmitter.h
index 167eff2..dd3be8c 100644
--- a/bctransmitter.h
+++ b/bctransmitter.h
@@ -18,7 +18,7 @@ public:
   explicit BCTransmitter(QObject *parent = nullptr);
 
   bcdata_t readRawValue( BCDevice::ID deviceID, BC::ID registerID ) const override;
-  void                    writeRawValue(BCDevice::ID deviceID, BC::ID registerID, bcdata_t value ) const override;
+  void     writeRawValue(BCDevice::ID deviceID, BC::ID registerID, bcdata_t value ) const override;
 
 public slots:
 
@@ -33,8 +33,6 @@ signals:
 
 private:
 
-
-
   using BCValueQueue = QQueue<const BCValue*>;
 
   BCValueQueue _valueQueue;
diff --git a/bcvalue.cpp b/bcvalue.cpp
index 2a25ea4..6d86767 100644
--- a/bcvalue.cpp
+++ b/bcvalue.cpp
@@ -28,6 +28,7 @@
  ***************************************************************************/
 
 #include <QMetaEnum>
+#include <QRandomGenerator>
 
 #include <bcvalue.h>
 
@@ -60,8 +61,9 @@ BCValue::BCValue(const BCValueType& valueType_, BCDevice::ID deviceID_, BC::ID r
 
 void BCValue::readRawValue( const BCAbstractTransmitter& transmitter ) const
 {
-  bcdata_t result = transmitter.readRawValue( deviceID, registerID );
-
+  //bcdata_t result = transmitter.readRawValue( deviceID, registerID );
+  bcdata_t myRandomByte = static_cast<quint8>(QRandomGenerator::global()->bounded(256));
+  value.fromValue<bcdata_t>( myRandomByte );
 }
 
 void BCValue::writeRawValue( const BCAbstractTransmitter& transmitter ) const