Index: AlarmDefs.h
===================================================================
diff -u -ra16e6de7d4a06b20851472e1dbdc20790bd1b38c -r76adbbf2a2c07dd63658303a4989da087a2251ff
--- AlarmDefs.h	(.../AlarmDefs.h)	(revision a16e6de7d4a06b20851472e1dbdc20790bd1b38c)
+++ AlarmDefs.h	(.../AlarmDefs.h)	(revision 76adbbf2a2c07dd63658303a4989da087a2251ff)
@@ -72,6 +72,7 @@
     ALARM_ID_RO_PUMP_OUT_PRESSURE_OUT_OF_RANGE = 47,                ///< Pressure at outlet of RO pump is out of range.
     ALARM_ID_TEMPERATURE_SENSORS_OUT_OF_RANGE = 48,                 ///< DG temperature sensors ADC read out of range
     ALARM_ID_TEMPERATURE_SENSORS_INCONSISTENT = 49,                 ///< DG temperature sensors values are inconsistent with respect to each other
+    ALARM_ID_HD_COMM_TIMEOUT = 50,                                  ///< HD communication timeout.
     NUM_OF_ALARM_IDS                                                ///< Total # of alarms.
 };
 /// Type for alarm list enumeration.
Index: MsgDefs.h
===================================================================
diff -u -ra16e6de7d4a06b20851472e1dbdc20790bd1b38c -r76adbbf2a2c07dd63658303a4989da087a2251ff
--- MsgDefs.h	(.../MsgDefs.h)	(revision a16e6de7d4a06b20851472e1dbdc20790bd1b38c)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 76adbbf2a2c07dd63658303a4989da087a2251ff)
@@ -109,7 +109,7 @@
 
     MSG_ID_FIRST_DG_TESTER_MESSAGE = 0xA000,                            ///< First DG test message ID.
     MSG_ID_DG_TESTER_LOGIN_REQUEST = MSG_ID_FIRST_DG_TESTER_MESSAGE,    ///< DG tester log-in.
-    MSG_ID_DG_MESSAGE = 0xA001,                                         ///< DG message.  TODO - needed?
+    MSG_ID_DG_ALARM_STATE_OVERRIDE = 0xA001,                            ///< DG alarm state override message ID.
     MSG_ID_DG_WATCHDOG_TASK_CHECKIN_OVERRIDE = 0xA002,                  ///< Watchdog check-in override request.
     MSG_ID_DG_SET_RTC_DATE_TIME = 0xA004,                               ///< DG RTC set date/time.
     MSG_ID_LOAD_CELL_OVERRIDE = 0xA005,                                 ///< Load cell sensor override request.