Index: firmware/App/Services/Reservoirs.h
===================================================================
diff -u -r8059b3b67364c3593091a23266f33186430ffe26 -r6145c5d1a645646587fb077df3c61eef2354f744
--- firmware/App/Services/Reservoirs.h	(.../Reservoirs.h)	(revision 8059b3b67364c3593091a23266f33186430ffe26)
+++ firmware/App/Services/Reservoirs.h	(.../Reservoirs.h)	(revision 6145c5d1a645646587fb077df3c61eef2354f744)
@@ -38,6 +38,14 @@
     NUM_OF_RESERVOIRS       ///< Number of reservoirs
 } RESERVOIR_ID_T;
 
+/// Enumeration of valve settings.
+typedef enum Valve_Setting
+{
+    VALVE_SETTING_R1_TO_R2 = 0,         ///< Valve setting for displacement from reservoir 1 to reservoir 2
+    VALVE_SETTING_R2_TO_R1,             ///< Valve setting for displacement from reservoir 2 to reservoir 1
+    NUM_OF_VALVE_SETTTINGS              ///< Number of valve settings
+} VALVE_SETTING_ID_T;
+
 #pragma pack(push,1)
 
 /// Drain command data structure.
@@ -61,13 +69,14 @@
 
 void initReservoirs( void );
 void execReservoirs( void );
+
+void setActiveReservoirCmd( RESERVOIR_ID_T resID );                 // handle switch reservoirs command from HD
+void changeValveSettingCmd( VALVE_SETTING_ID_T valveSettingID );    // handle valve setting change command from HD
+void startFillCmd( U32 fillToVolMl );                               // handle fill command from HD
+void stopFillCmd( void );                                           // handle stop fill command from HD
+void startDrainCmd( DRAIN_CMD_T drainCmd );                         // handle drain command from HD
+void stopDrainCmd( void );                                          // handle stop drain command from HD
 
-void setActiveReservoirCmd( RESERVOIR_ID_T resID );    // handle switch reservoirs command from HD
-void startFillCmd( U32 fillToVolMl );                  // handle fill command from HD
-void stopFillCmd( void );                              // handle stop fill command from HD
-void startDrainCmd( DRAIN_CMD_T drainCmd );            // handle drain command from HD
-void stopDrainCmd( void );                             // handle stop drain command from HD
-
 RESERVOIR_ID_T getInactiveReservoir( void );
 BOOL hasTargetFillVolumeBeenReached( RESERVOIR_ID_T reservoirId );
 BOOL hasTargetDrainVolumeBeenReached( RESERVOIR_ID_T reservoirId , U32 timeout );