Index: firmware/App/Modes/ModeWaterGen.c
===================================================================
diff -u -r28b6e281605c1a944c982d0ec7dcdb6f28aac82b -r12c4f28723f9af89ae693df771039da1bc7ffc80
--- firmware/App/Modes/ModeWaterGen.c	(.../ModeWaterGen.c)	(revision 28b6e281605c1a944c982d0ec7dcdb6f28aac82b)
+++ firmware/App/Modes/ModeWaterGen.c	(.../ModeWaterGen.c)	(revision 12c4f28723f9af89ae693df771039da1bc7ffc80)
@@ -15,10 +15,12 @@
 *
 ***************************************************************************/
 
-#include "ModeWaterGen.h"
+
 #include "DDInterface.h"
 #include "Level.h"
 #include "ModeStandby.h"
+#include "ModeWaterGen.h"
+#include "ModeWaterPreGen.h"
 #include "MessageSupport.h"
 #include "Messaging.h"
 #include "OperationModes.h"
@@ -42,6 +44,7 @@
 static U32 genWaterDataPublicationTimerCounter;                                          ///< Used to schedule generate water data publication to CAN bus.
 static OVERRIDE_U32_T genWaterDataPublishInterval;                                       ///< Generate water mode data publish interval.
 static U32 stateDelayTime;                                                               ///< Time stamp to track delay before valve switch.
+static U32 pendingStartGenRequest;                                                       ///< Flag indicating DD has requested RO start the generate permeate.
 
 // ********** private function prototypes **********
 
@@ -300,7 +303,43 @@
     }
 }
 
+/*********************************************************************//**
+ * @brief
+ * The requestGenWaterStart function handles an DD request to start (go to gen permeate mode).
+ * @details \b Inputs: preGenWState
+ * @details \b Outputs: pendingStartGenRequest
+ * @return TRUE if request accepted, FALSE if not.
+ *************************************************************************/
+BOOL requestGenWaterStart( void )
+{
+    BOOL result = FALSE;
 
+    if ( RO_PRE_GENW_STATE_COMPLETE == getCurrentPreGenWState() )
+    {
+        result                 = TRUE;
+        pendingStartGenRequest = TRUE;
+    }
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The requestGenWaterStop function handles an DD request to stop (go to standby mode).
+ * @details \b Inputs: none
+ * @details \b Outputs: pendingStartGenRequest
+ * @return TRUE if request accepted, FALSE if not.
+ *************************************************************************/
+BOOL requestGenWaterStop( void )
+{
+    BOOL result = TRUE;
+    pendingStartGenRequest = FALSE;
+    requestNewOperationMode( RO_MODE_STAN );
+
+    return result;
+}
+
+
 /*************************************************************************
  *                       TEST SUPPORT FUNCTIONS
  *************************************************************************/