Index: leahi_dialin/td/treatment_delivery.py
===================================================================
diff -u -r028086f4e594e25b8e693242fdce1cc41c8b0312 -rb0527bdf20a053b81f4c3771b2b31bb066c9a5a7
--- leahi_dialin/td/treatment_delivery.py	(.../treatment_delivery.py)	(revision 028086f4e594e25b8e693242fdce1cc41c8b0312)
+++ leahi_dialin/td/treatment_delivery.py	(.../treatment_delivery.py)	(revision b0527bdf20a053b81f4c3771b2b31bb066c9a5a7)
@@ -401,5 +401,39 @@
             self.logger.debug("Timeout!!!!")
             return False
 
+    def cmd_td_safety_shutdown_override(self, active: int, reset: int = NO_RESET) -> int:
+        """
+        Constructs and sends an TD safety shutdown override command via CAN bus.
+        Constraints:
+            Must be logged into TD.
 
+        @param active:  int - True to activate safety shutdown, False to deactivate
+        @param reset:  integer - 1 to reset a previous override, 0 to override
+        @return: 1 if successful, zero otherwise
 
+        """
+
+        rst = integer_to_bytearray(reset)
+        saf = integer_to_bytearray(active)
+        payload = rst + saf
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_td_ch_id,
+                                              message_id=MsgIds.MSG_ID_TD_SAFETY_SHUTDOWN_OVERRIDE.value,
+                                              payload=payload)
+
+        self.logger.debug("overriding TD safety shutdown")
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        if received_message is not None:
+            if received_message['message'][DenaliMessage.PAYLOAD_START_INDEX] == 1:
+                self.logger.debug("Safety shutdown signal overridden")
+            else:
+                self.logger.debug("Safety shutdown signal override failed.")
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
+            return False
+
+