Index: simulator/plugins/treatmentranges/loader.py
===================================================================
diff -u -r341770d5391499aea02f9a840ac96e6562215699 -r967521dff94783ce48b50abc8db6bcd67bb501bf
--- simulator/plugins/treatmentranges/loader.py	(.../loader.py)	(revision 341770d5391499aea02f9a840ac96e6562215699)
+++ simulator/plugins/treatmentranges/loader.py	(.../loader.py)	(revision 967521dff94783ce48b50abc8db6bcd67bb501bf)
@@ -10,7 +10,7 @@
 # parent
 from simulator.dynamicloader import DynamicLoader
 # hd Simulator
-from dialin.ui.hd_simulator import HDSimulator
+from simulator.interface import SimulationInterface
 # plugin specific
 # -- none --
 
@@ -30,9 +30,8 @@
     spnUFVolumeMax: QtWidgets.QSpinBox
     sldDurationValue: QtWidgets.QSlider
 
-    def __init__(self, hd_simulator: HDSimulator):
-        super().__init__(os.path.dirname(__file__), hd_simulator)
-        print(" ---------- ", self.hd_simulator)
+    def __init__(self, interface: SimulationInterface):
+        super().__init__(os.path.dirname(__file__), interface)
 
     def _init_loader(self):
         """
@@ -54,6 +53,7 @@
         :return: none
         """
         self.timer.timeout.connect(self.do_ranges_data)
+        
         self.timer.timeout.connect(self.do_duration_data)
         self.sldDurationValue.valueChanged.connect(self.do_duration_data)
 
@@ -71,10 +71,11 @@
         sends the duration message
         :return: none
         """
-        value = self.sldDurationValue.value()
-        self.hd_simulator.cmd_set_treatment_time(
-            self.spnDurationMax.value() * 60, value
-        )
+        if self.chkRangesBroadcast.isChecked():
+            value = self.sldDurationValue.value()
+            self.interface.hd.cmd_set_treatment_time(
+                self.spnDurationMax.value() * 60, value
+            )
 
     @Slot()
     def do_ranges_data(self):
@@ -88,7 +89,7 @@
             self.sldDurationValue.setMinimum(duration_min * 60)
             self.sldDurationValue.setMaximum(duration_max * 60)
 
-            self.hd_simulator.cmd_set_treatment_parameter_ranges(
+            self.interface.hd.cmd_set_treatment_parameter_ranges(
                 duration_min,
                 duration_max,
                 self.spnUFVolumeMin.value(),