Index: firmware/App/Modes/ModeInitPOST.c
===================================================================
diff -u -r47c41046beba8affaaaa13a4f222a7b99bd193f1 -recf20c9111729fe3264aa381ccb06cdd695bf98a
--- firmware/App/Modes/ModeInitPOST.c	(.../ModeInitPOST.c)	(revision 47c41046beba8affaaaa13a4f222a7b99bd193f1)
+++ firmware/App/Modes/ModeInitPOST.c	(.../ModeInitPOST.c)	(revision ecf20c9111729fe3264aa381ccb06cdd695bf98a)
@@ -99,6 +99,7 @@
     switch ( postState )
     {
         case DG_POST_STATE_START:
+            SEND_EVENT_WITH_2_U32_DATA( DG_EVENT_STARTUP, 0, 0 )
             postState = DG_POST_STATE_FW_COMPATIBILITY;
 #ifdef SKIP_POST
             postState = DG_POST_STATE_COMPLETED;
Index: firmware/App/Modes/OperationModes.c
===================================================================
diff -u -r992dce16d63424ddd30fe9ac2f819e9a53b21977 -recf20c9111729fe3264aa381ccb06cdd695bf98a
--- firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision 992dce16d63424ddd30fe9ac2f819e9a53b21977)
+++ firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision ecf20c9111729fe3264aa381ccb06cdd695bf98a)
@@ -122,6 +122,7 @@
 void execOperationModes( void )
 {
     DG_OP_MODE_T newMode;
+    U32 priorSubMode = currentSubMode;
 
     // any new mode requests?
     newMode = arbitrateModeRequest();   // will return current mode if no pending requests
@@ -197,6 +198,16 @@
             break;
     }
 
+    // Send sub-mode change event when appropriate
+    if ( lastMode != currentMode )
+    {
+        priorSubMode = 0;
+    }
+    if ( ( priorSubMode != currentSubMode ) || ( lastMode != currentMode ) )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( DG_EVENT_SUB_MODE_CHANGE, priorSubMode, currentSubMode )
+    }
+
     // publish op mode on interval
     broadcastOperationMode();
 }
@@ -296,6 +307,8 @@
  *************************************************************************/
 static void transitionToNewOperationMode( DG_OP_MODE_T newMode )
 {
+    SEND_EVENT_WITH_2_U32_DATA( DG_EVENT_OP_MODE_CHANGE, lastMode, newMode )
+
     // setup for new operating mode
     switch ( newMode )
     {
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r92a0a399021a2d120155b0a779855893284b8cbb -recf20c9111729fe3264aa381ccb06cdd695bf98a
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 92a0a399021a2d120155b0a779855893284b8cbb)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision ecf20c9111729fe3264aa381ccb06cdd695bf98a)
@@ -216,6 +216,41 @@
 
 /*********************************************************************//**
  * @brief
+ * The sendEvent function constructs an DG event message to the UI and
+ * queues the msg for transmit on the appropriate CAN channel.
+ * @details Inputs: none
+ * @details Outputs: DG event msg constructed and queued.
+ * @param event Enumeration of event type that occurred
+ * @param dat1 First data associated with event
+ * @param dat2 Second data associated with event
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendEvent( DG_EVENT_ID_T event, EVENT_DATA_T dat1, EVENT_DATA_T dat2 )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+    U32 e = (U32)event;
+
+    // Create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_DG_EVENT;
+    msg.hdr.payloadLen = sizeof( U32 ) + sizeof( EVENT_DATA_T ) * 2;
+
+    memcpy( payloadPtr, &e, sizeof( U32 ) );
+    payloadPtr += sizeof( U32 );
+    memcpy( payloadPtr, &dat1, sizeof( EVENT_DATA_T ) );
+    payloadPtr += sizeof( EVENT_DATA_T );
+    memcpy( payloadPtr, &dat2, sizeof( EVENT_DATA_T ) );
+
+    // Serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_2_UI, ACK_REQUIRED );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
  * The broadcastAlarmTriggered function constructs an alarm triggered msg to
  * be broadcast and queues the msg for transmit on the appropriate CAN channel.
  * @details Inputs: none
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r233034b67edaee48012bf9a5478327519e0256bb -recf20c9111729fe3264aa381ccb06cdd695bf98a
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 233034b67edaee48012bf9a5478327519e0256bb)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision ecf20c9111729fe3264aa381ccb06cdd695bf98a)
@@ -52,6 +52,9 @@
 // ACK MSG
 BOOL sendACKMsg( MESSAGE_T *message );
 
+// MSG_ID_DG_EVENT
+BOOL sendEvent( DG_EVENT_ID_T event, EVENT_DATA_T dat1, EVENT_DATA_T dat2 );
+
 // MSG_ID_ALARM_TRIGGERED
 BOOL broadcastAlarmTriggered( U32 alarm, ALARM_DATA_T almData1, ALARM_DATA_T almData2 );