Index: dialin/hd/treatment.py
===================================================================
diff -u -rfaf6efcc6770d7fa36ef0cbaeae7bb6bd664691c -r8d4a925b98acbd7b2590563fd019bed6c6d55c0f
--- dialin/hd/treatment.py	(.../treatment.py)	(revision faf6efcc6770d7fa36ef0cbaeae7bb6bd664691c)
+++ dialin/hd/treatment.py	(.../treatment.py)	(revision 8d4a925b98acbd7b2590563fd019bed6c6d55c0f)
@@ -628,9 +628,9 @@
         vol = struct.unpack('f', bytearray(
             message['message'][MsgFieldPositions.START_POS_FIELD_4:MsgFieldPositions.END_POS_FIELD_4]))
         rsvr_dpi_vol = struct.unpack('f', bytearray(
-            message['message'][MsgFieldPositions.START_POS_FIELD_4:MsgFieldPositions.END_POS_FIELD_4]))
-        rsrvr_switch = struct.unpack('i', bytearray(
             message['message'][MsgFieldPositions.START_POS_FIELD_5:MsgFieldPositions.END_POS_FIELD_5]))
+        rsrvr_switch = struct.unpack('i', bytearray(
+            message['message'][MsgFieldPositions.START_POS_FIELD_6:MsgFieldPositions.END_POS_FIELD_6]))
 
         self.saline_bolus_max_vol = mxm[0]
         self.saline_bolus_cum_vol = cum[0]