Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -r766708fceb0bdf1af8c7897df29d4f5036bfd3db -r6e07046677cba738be6f78b155f4f23120a43081
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 766708fceb0bdf1af8c7897df29d4f5036bfd3db)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 6e07046677cba738be6f78b155f4f23120a43081)
@@ -123,13 +123,20 @@
     BOOL tareLoadCells;
 } DRAIN_RESERVOIR_CMD_PAYLOAD_T;
 
+/// DG command response data record structure.
+typedef struct
+{
+    U32 commandID;          ///< The command DG is responding to
+    BOOL rejected;          ///< Flag indicates if the command has been rejected
+    U32 rejectCode;         ///< Reason code for rejecting the command
+} DG_CMD_RESPONSE_T;
+
 // ********** public function prototypes **********
 
 void initDGInterface( void );
 
 void execDGInterfaceMonitor( void );
 
-void initPreTreatmentReservoirMgmt( void );
 void initTreatmentReservoirMgmt( void );
 void execTreatmentReservoirMgmt( void );
 
@@ -164,6 +171,9 @@
 void cmdStopDGTrimmerHeater( void );
 void cmdDGSampleWater( void );
 
+void handleDGCommandResponse( U08 *cmdRespPtr );
+void getDGCommandResponse( DG_CMD_RESPONSE_T *cmdRespPtr );
+
 BOOL testSetDialOutLoadCellWeightOverride( U32 sensor, F32 value );
 BOOL testResetDialOutLoadCellWeightOverride( U32 sensor );