Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -rc4d489831394f0954dfcddf8158baf0da09ad5c8 -rbc8403b288e167f51c9e991c2a07bb455c77c19a
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision c4d489831394f0954dfcddf8158baf0da09ad5c8)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision bc8403b288e167f51c9e991c2a07bb455c77c19a)
@@ -52,10 +52,18 @@
 /// Enumeration of DG reservoirs.
 typedef enum DG_Reservoirs
 {
-    DG_RESERVOIR_1 = 0,                             ///< Reservoir #1.
-    DG_RESERVOIR_2,                                 ///< Reservoir #2.
+    DG_RESERVOIR_1 = 0,                             ///< Reservoir number 1.
+    DG_RESERVOIR_2,                                 ///< Reservoir number 2.
     NUM_OF_DG_RESERVOIRS                            ///< Number of reservoirs.
 } DG_RESERVOIR_ID_T;
+
+/// Enumeration of DG valve settings.
+typedef enum DG_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
+} DG_VALVE_SETTING_ID_T;
 
 /// Enumeration of DG pressure sensors.
 typedef enum DG_PressureSensors
@@ -164,7 +172,8 @@
 void cmdSetDGDialysateTargetTemps( F32 primaryHtrTemp, F32 trimmerHtrTemp );
 void cmdStartDG( void );
 void cmdStopDG( void );
-void cmdSetDGActiveReservoir( DG_RESERVOIR_ID_T resID );
+void cmdSetDGActiveReservoir( DG_RESERVOIR_ID_T resID );
+void cmdChangeDGValveSetting( DG_VALVE_SETTING_ID_T valveSettingID );
 void cmdStartDGFill( U32 fillToVolMl );
 void cmdStartDGDrain( U32 drainToVolMl, BOOL tareLoadCell );
 void cmdStartDGTrimmerHeater( void );