Index: TD_Heparin/loader.py
===================================================================
diff -u -ra7779af44ced3be6e30e4d4d67125d171a641d09 -rfc43fc2ed484aec6f49ef1c7f67a71c4d0d5d0d3
--- TD_Heparin/loader.py	(.../loader.py)	(revision a7779af44ced3be6e30e4d4d67125d171a641d09)
+++ TD_Heparin/loader.py	(.../loader.py)	(revision fc43fc2ed484aec6f49ef1c7f67a71c4d0d5d0d3)
@@ -14,7 +14,8 @@
 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
 
@@ -93,7 +94,7 @@
         @return: None
         """
         message = message['message']
-        index = MsgFieldPositions.START_POS_FIELD_1
+        index = MSG_HEADER_SIZE
         state,index = conversions.bytearray_to_integer( message, index)
         self.lbHeparin .setText( str(state) )