Index: simulator/plugins/treatmentranges/loader.py
===================================================================
diff -u -r7f0678d0f61fa99a35a1f34fac6c36e12ba93f20 -r967521dff94783ce48b50abc8db6bcd67bb501bf
--- simulator/plugins/treatmentranges/loader.py	(.../loader.py)	(revision 7f0678d0f61fa99a35a1f34fac6c36e12ba93f20)
+++ 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 --
 
@@ -30,8 +30,8 @@
     spnUFVolumeMax: QtWidgets.QSpinBox
     sldDurationValue: QtWidgets.QSlider
 
-    def __init__(self, hd_simulator: HDSimulator):
-        super().__init__(os.path.dirname(__file__), hd_simulator)
+    def __init__(self, interface: SimulationInterface):
+        super().__init__(os.path.dirname(__file__), interface)
 
     def _init_loader(self):
         """
@@ -73,7 +73,7 @@
         """
         if self.chkRangesBroadcast.isChecked():
             value = self.sldDurationValue.value()
-            self.hd_simulator.cmd_set_treatment_time(
+            self.interface.hd.cmd_set_treatment_time(
                 self.spnDurationMax.value() * 60, value
             )
 
@@ -89,7 +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(),