Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r32d22b41c0297166bf2c89e59c968d69828d5025 -r0bf1c0824844ed4c227eef0323238daedf505dc7
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 32d22b41c0297166bf2c89e59c968d69828d5025)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 0bf1c0824844ed4c227eef0323238daedf505dc7)
@@ -1900,6 +1900,35 @@
 
 /*********************************************************************//**
  * @brief
+ * The handleDGOperationModeRequest function handles a request to change
+ * DG operation mode.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleDGOperationModeRequest( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+    DG_OP_MODE_T mode;
+
+    // verify payload length
+    if ( sizeof( DG_OP_MODE_T ) == message->hdr.payloadLen )
+    {
+        if ( TRUE == isTestingActivated() )
+        {
+            memcpy( &mode, message->payload, sizeof( DG_OP_MODE_T ) );
+            requestNewOperationMode( mode );
+            result = mode < DG_MODE_NLEG;
+        }
+    }
+
+    // respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
+/*********************************************************************//**
+ * @brief
  * The handleSetConcentratePumpTargetSpeed function handles a request to
  * override a concentrate pump's target speed value.
  * @details Inputs: none