diff --git a/rmapplugin/rmapplugin.cpp b/rmapplugin/rmapplugin.cpp
--- a/rmapplugin/rmapplugin.cpp
+++ b/rmapplugin/rmapplugin.cpp
@@ -388,12 +388,8 @@ void rmapplugin::connectPythonWrapper()
     // TIMECODES
     connect( (rmappluginPythonWrapper*)this->pyObject, SIGNAL(sig_sendOneTimecode()),
              this->UI->starDundee, SLOT(sendOneTimecode()) );
-    connect( (rmappluginPythonWrapper*)this->pyObject, SIGNAL(sig_sendTimecodePeriodically()),
-             this->UI->starDundee, SLOT(sendTimecodePeriodically()) );
-    connect( (rmappluginPythonWrapper*)this->pyObject, SIGNAL(sig_sendOneTimePacketAndOneTimecode()),
-             this->UI->starDundee, SLOT(sendOneTimePacketAndOneTimecode()) );
-    connect( (rmappluginPythonWrapper*)this->pyObject, SIGNAL(sig_sendOneTimePacketAndTimecodePeriodically()),
-             this->UI->starDundee, SLOT(sendOneTimePacketAndTimecodePeriodically()) );
+    connect( (rmappluginPythonWrapper*)this->pyObject, SIGNAL(sig_sendTimecodePeriodically(unsigned char)),
+             this->UI->starDundee, SLOT(startSendingTimecodePeriodically(unsigned char)) );
 }
 
 
diff --git a/rmapplugin/rmappluginpythonwrapper.cpp b/rmapplugin/rmappluginpythonwrapper.cpp
--- a/rmapplugin/rmappluginpythonwrapper.cpp
+++ b/rmapplugin/rmappluginpythonwrapper.cpp
@@ -158,8 +158,10 @@ void rmappluginPythonWrapper::sendOneTim
     emit sig_sendOneTimecode();
 }
 
-void rmappluginPythonWrapper::sendTimecodePeriodically()
+void rmappluginPythonWrapper::sendTimecodePeriodically( unsigned int onOff )
 {
-    emit sig_sendTimecodePeriodically();
+    unsigned char newOnOff;
+    newOnOff = (unsigned char) onOff;
+    emit sig_sendTimecodePeriodically( newOnOff );
 }
 
diff --git a/rmapplugin/rmappluginpythonwrapper.h b/rmapplugin/rmappluginpythonwrapper.h
--- a/rmapplugin/rmappluginpythonwrapper.h
+++ b/rmapplugin/rmappluginpythonwrapper.h
@@ -43,7 +43,7 @@ signals:
     //*******************
     // TIMECODE SIGNALS
     void sig_sendOneTimecode();
-    void sig_sendTimecodePeriodically();
+    void sig_sendTimecodePeriodically(unsigned char);
     
 public slots:
     QList<QVariant> ReadSPW(unsigned int size=0);
@@ -67,7 +67,7 @@ public slots:
     //*******************
     // TIMECODE FUNCTIONS
     void sendOneTimecode();
-    void sendTimecodePeriodically();
+    void sendTimecodePeriodically(unsigned int onOff);
     
 };
 
diff --git a/rmapplugin/stardundee.cpp b/rmapplugin/stardundee.cpp
--- a/rmapplugin/stardundee.cpp
+++ b/rmapplugin/stardundee.cpp
@@ -1045,6 +1045,7 @@ void StarDundee::sendTimecodePeriodicall
 
         flag_sendTimecodePeriodically = true;
         this->starDundeeSendTimecodePeriodically->setText("stop timecodes at 1 Hz");
+        starDundeeSendOneTimePacketAndTimecodePeriodically->setEnabled( false );
     }
     else
     {
@@ -1057,6 +1058,28 @@ void StarDundee::sendTimecodePeriodicall
     }
 }
 
+void StarDundee::startSendingTimecodePeriodically(unsigned char onOff)
+{
+    if (onOff == 0)
+    {
+        if (!USBSpaceWire_TC_EnableAutoTickIn(hDevice, 0, 0))
+            emit sendMessage("Could not disable auto tick-in");
+
+        flag_sendTimecodePeriodically = false;
+        this->starDundeeSendTimecodePeriodically->setText("start timecodes at 1 Hz");
+        starDundeeSendOneTimePacketAndTimecodePeriodically->setEnabled( true );
+    }
+    else
+    {
+        if (!USBSpaceWire_TC_EnableAutoTickIn(hDevice, 1, 1))
+            emit sendMessage("Could not enable auto tick-in");
+
+        flag_sendTimecodePeriodically = true;
+        this->starDundeeSendTimecodePeriodically->setText("stop timecodes at 1 Hz");
+        starDundeeSendOneTimePacketAndTimecodePeriodically->setEnabled( false );
+    }
+}
+
 void StarDundee::sendUpdateTime(long time)
 {
     Packet_TC_LFR_UPDATE_TIME_t packet;
diff --git a/rmapplugin/stardundee.h b/rmapplugin/stardundee.h
--- a/rmapplugin/stardundee.h
+++ b/rmapplugin/stardundee.h
@@ -62,6 +62,7 @@ public slots:
     // TIMECODES
     void sendOneTimecode();
     void sendTimecodePeriodically();
+    void startSendingTimecodePeriodically( unsigned char onOff );
     void sendOneTimePacketAndOneTimecode();
     void sendOneTimePacketAndTimecodePeriodically();
     void updateTimeToSend(long timeToSend);