Index: simulator/plugins/__poweroff/loader.py
===================================================================
diff -u -red2d7cb5c8c2059444fd17cd4e1c0975461a903c -r967521dff94783ce48b50abc8db6bcd67bb501bf
--- simulator/plugins/__poweroff/loader.py	(.../loader.py)	(revision ed2d7cb5c8c2059444fd17cd4e1c0975461a903c)
+++ simulator/plugins/__poweroff/loader.py	(.../loader.py)	(revision 967521dff94783ce48b50abc8db6bcd67bb501bf)
@@ -9,7 +9,8 @@
 # parent
 from simulator.dynamicloader import DynamicLoader
 # hd Simulator
-from dialin.ui.hd_simulator import HDSimulator, TXStates
+from simulator.interface import SimulationInterface
+from dialin.ui.hd_simulator import TXStates
 # plugin specific
 # -- None --
 
@@ -28,8 +29,8 @@
 
     requested_state: TXStates
 
-    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)
         self.requested_state = TXStates.HEPARIN_STATE_PAUSED
 
     def _init_loader(self):
@@ -76,7 +77,7 @@
         else:
             self.requested_state = TXStates.HEPARIN_STATE_DISPENSING
 
-        self.hd_simulator.cmd_set_heparin_pause_resume_response(True, 0, self.requested_state)
+        self.interface.hd.cmd_set_heparin_pause_resume_response(True, 0, self.requested_state)
         self.lblAction.setText('Accepted ')
 
     @Slot()
@@ -86,7 +87,7 @@
         :return: none
         """
         reason = self.spnRejectReason.value()
-        self.hd_simulator.cmd_set_heparin_pause_resume_response(False, reason, self.requested_state)
+        self.interface.hd.cmd_set_heparin_pause_resume_response(False, reason, self.requested_state)
         self.lblAction.setText('Rejected ' + "{}".format(reason))
 
     @Slot()
@@ -97,5 +98,5 @@
         :return: none
         """
         volume = value * 0.1
-        self.hd_simulator.cmd_set_treatment_heparin_data(volume)
+        self.interface.hd.cmd_set_treatment_heparin_data(volume)
         self.lblCumulative.setNum(volume)