Index: dialin/hd/alarms.py
===================================================================
diff -u -rb2883ad890516361d0c22919811ff1d5752c0aaf -r4828fa8a43886d9dedc8f1f379a7052e423a0c90
--- dialin/hd/alarms.py	(.../alarms.py)	(revision b2883ad890516361d0c22919811ff1d5752c0aaf)
+++ dialin/hd/alarms.py	(.../alarms.py)	(revision 4828fa8a43886d9dedc8f1f379a7052e423a0c90)
@@ -121,15 +121,14 @@
         # alarm debug data on alarm triggered message
         self.alarm_data = [0, 0] * 500
 
-
-
         # alarm information
         self.alarm_data_type = dict()
         self.alarm_volume = 0
         self.alarm_audio_curr_hg = 0.0
         self.alarm_audio_curr_lg = 0.0
         self.alarm_backup_audio_curr = 0.0
         self.safety_shutdown_active = False
+        self.ac_power_lost = False
         self.alarm_table_button_blockers = [False] * self.AlarmResponseButtons.NUM_OF_HD_ALARM_RESPONSE_BUTTONS.value
         self.alarm_state_button_blockers = [False] * self.AlarmResponseButtons.NUM_OF_HD_ALARM_RESPONSE_BUTTONS.value
 
@@ -316,6 +315,14 @@
         """
         return self.safety_shutdown_active
 
+    def get_ac_power_lost(self):
+        """
+        Gets the state of the HD a/c power loss signal.
+
+        @return: (bool) a/c power is lost (T/F)
+        """
+        return self.ac_power_lost
+
     def get_alarm_flag_system_fault(self) -> bool:
         """
         Gets the alarm flag system fault.
@@ -512,7 +519,7 @@
         self.hd_alarm_clr_condition_timestamp = timestamp
 
     @publish(["hd_alarm_information_timestamp", "alarm_volume", "alarm_audio_curr_hg", "alarm_audio_curr_lg", "alarm_backup_audio_curr",
-              "safety_shutdown_active", "alarm_table_button_blockers", "alarm_state_button_blockers"])
+              "safety_shutdown_active", "ac_power_lost", "alarm_table_button_blockers", "alarm_state_button_blockers"])
     def _handler_alarm_information_sync(self, message, timestamp=0.0):
         """
         Handles published HD alarm information broadcast messages.
@@ -531,24 +538,27 @@
             message['message'][MsgFieldPositions.START_POS_FIELD_4:MsgFieldPositions.END_POS_FIELD_4]))
         saf = struct.unpack('i', bytearray(
             message['message'][MsgFieldPositions.START_POS_FIELD_5:MsgFieldPositions.END_POS_FIELD_5]))
+        acp = struct.unpack('i', bytearray(
+            message['message'][MsgFieldPositions.START_POS_FIELD_6:MsgFieldPositions.END_POS_FIELD_6]))
         trs = struct.unpack('B', bytearray(
-            message['message'][MsgFieldPositions.END_POS_FIELD_5:MsgFieldPositions.END_POS_FIELD_5+1]))
+            message['message'][MsgFieldPositions.END_POS_FIELD_7:MsgFieldPositions.END_POS_FIELD_7+1]))
         trb = struct.unpack('B', bytearray(
-            message['message'][MsgFieldPositions.END_POS_FIELD_5+1:MsgFieldPositions.END_POS_FIELD_5+2]))
+            message['message'][MsgFieldPositions.END_POS_FIELD_7+1:MsgFieldPositions.END_POS_FIELD_7+2]))
         tet = struct.unpack('B', bytearray(
-            message['message'][MsgFieldPositions.END_POS_FIELD_5+2:MsgFieldPositions.END_POS_FIELD_5+3]))
+            message['message'][MsgFieldPositions.END_POS_FIELD_7+2:MsgFieldPositions.END_POS_FIELD_7+3]))
         srs = struct.unpack('B', bytearray(
-            message['message'][MsgFieldPositions.END_POS_FIELD_5+3:MsgFieldPositions.END_POS_FIELD_5+4]))
+            message['message'][MsgFieldPositions.END_POS_FIELD_7+3:MsgFieldPositions.END_POS_FIELD_7+4]))
         srb = struct.unpack('B', bytearray(
-            message['message'][MsgFieldPositions.END_POS_FIELD_5+4:MsgFieldPositions.END_POS_FIELD_5+5]))
+            message['message'][MsgFieldPositions.END_POS_FIELD_7+4:MsgFieldPositions.END_POS_FIELD_7+5]))
         set = struct.unpack('B', bytearray(
-            message['message'][MsgFieldPositions.END_POS_FIELD_5+5:MsgFieldPositions.END_POS_FIELD_5+6]))
+            message['message'][MsgFieldPositions.END_POS_FIELD_7+5:MsgFieldPositions.END_POS_FIELD_7+6]))
 
         self.alarm_volume = vol[0]
         self.alarm_audio_curr_hg = ach[0]
         self.alarm_audio_curr_lg = acl[0]
         self.alarm_backup_audio_curr = bac[0]
         self.safety_shutdown_active = True if saf[0] == 1 else False
+        self.ac_power_lost = True if acp[0] == 1 else False
         self.alarm_table_button_blockers[self.AlarmResponseButtons.HD_ALARM_RESPONSE_BUTTON_RESUME.value] = True if trs[0] == 1 else False
         self.alarm_table_button_blockers[self.AlarmResponseButtons.HD_ALARM_RESPONSE_BUTTON_RINSEBACK.value] = True if trb[0] else False
         self.alarm_table_button_blockers[self.AlarmResponseButtons.HD_ALARM_RESPONSE_BUTTON_END_TREATMENT.value] = True if tet[0] else False