Index: TD_TreatmentAdjustmentsIsolatedUF/loader.py
===================================================================
diff -u -re33573617b167dc9a2f7f54529b4603c74e1a8a5 -rfc43fc2ed484aec6f49ef1c7f67a71c4d0d5d0d3
--- TD_TreatmentAdjustmentsIsolatedUF/loader.py	(.../loader.py)	(revision e33573617b167dc9a2f7f54529b4603c74e1a8a5)
+++ TD_TreatmentAdjustmentsIsolatedUF/loader.py	(.../loader.py)	(revision fc43fc2ed484aec6f49ef1c7f67a71c4d0d5d0d3)
@@ -15,7 +15,8 @@
 from engine.dynamicloader   import DynamicLoader
 
 # plugin specific
-from leahi_dialin.common.msg_defs import MsgIds, MsgFieldPositions
+from leahi_dialin.common.msg_ids    import MsgIds
+from leahi_dialin.common.constants  import MSG_HEADER_SIZE
 from leahi_dialin.protocols       import CAN
 from leahi_dialin.utils           import conversions
 
@@ -154,7 +155,7 @@
         :return: none
         """
         message = message['message']
-        index = MsgFieldPositions.START_POS_FIELD_1
+        index = MSG_HEADER_SIZE
         value,index = conversions.bytearray_to_integer(message, index)
         self.lbDurationReq.setText(f"{value:.0f}")
 
@@ -191,7 +192,7 @@
         :return: none
         """
         message = message['message']
-        index = MsgFieldPositions.START_POS_FIELD_1
+        index = MSG_HEADER_SIZE
         self.reqDuration,index = conversions.bytearray_to_integer(message, index, False)
         self.reqVolume,index = conversions.bytearray_to_integer(message, index, False)
         self.lbVolumeReqParams.setText(f"Duration (min) = {self.reqDuration}, Volume (mL) = {self.reqVolume}")
@@ -255,7 +256,7 @@
         :return: none
         """
         message = message['message']
-        index = MsgFieldPositions.START_POS_FIELD_1
+        index = MSG_HEADER_SIZE
         value,index = conversions.bytearray_to_integer(message, index)
         cmdString = self.cmdStrings[value] if value >= 0 and value < len(self.cmdStrings) else "<unknown>"
         self.lbStateReq.setText(f"{cmdString} ({value})")