Index: leahi_dialin/common/msg_ids.py
===================================================================
diff -u -r4012a0787038f9d82577b664df8c668abadecaab -ra313166ac02fdc81a9d2b24eca45cded18fd468e
--- leahi_dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 4012a0787038f9d82577b664df8c668abadecaab)
+++ leahi_dialin/common/msg_ids.py	(.../msg_ids.py)	(revision a313166ac02fdc81a9d2b24eca45cded18fd468e)
@@ -183,9 +183,12 @@
     MSG_ID_DD_BC_VALVE_STATES_OVERRIDE_REQUEST = 0xA036
     MSG_ID_DD_BC_SWITCH_ONLY_START_STOP_OVERRIDE_REQUEST = 0xA037
     MSG_ID_DD_HYD_CHAMBER_TARGET_TEMP_OVERRIDE_REQUEST = 0xA038
+    MSG_ID_DD_ACID_DOSING_VOLUME_OVERRIDE_REQUEST = 0xA039
+    MSG_ID_DD_BICARB_DOSING_VOLUME_OVERRIDE_REQUEST = 0xA03A
 
     MSG_ID_DD_PISTON_PUMP_DATA_PUBLISH_OVERRIDE_REQUEST = 0xAF00
     MSG_ID_DD_PISTON_PUMP_START_STOP_OVERRIDE_REQUEST = 0xAF01
+    MSG_ID_DD_PISTON_PUMP_FILL_AFTER_DISPENSE_OVERRIDE_REQUEST = 0xAF02
 
     MSG_ID_FIRST_RO_TESTER_MESSAGE = 0xB000
     MSG_ID_RO_SOFTWARE_RESET_REQUEST = 0xB001
Index: leahi_dialin/dd/modules/balancing_chamber.py
===================================================================
diff -u -r9466b5c6b5867f392104a42608aa9542a7ff0358 -ra313166ac02fdc81a9d2b24eca45cded18fd468e
--- leahi_dialin/dd/modules/balancing_chamber.py	(.../balancing_chamber.py)	(revision 9466b5c6b5867f392104a42608aa9542a7ff0358)
+++ leahi_dialin/dd/modules/balancing_chamber.py	(.../balancing_chamber.py)	(revision a313166ac02fdc81a9d2b24eca45cded18fd468e)
@@ -192,4 +192,78 @@
             return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
         else:
             self.logger.error("Timeout!!!!")
-            return False
\ No newline at end of file
+            return False
+
+    def cmd_acid_dose_volume_override(self, volume: float, reset: int = NO_RESET) -> int:
+        """
+        Constructs and sends the acid dose volume override command
+        Constraints:
+            Must be logged into DD.
+
+        @param volume:  float - volume value to override acid dose with
+        @param reset:  integer - 1 to reset a previous override, 0 to override
+        @return: 1 if successful, zero otherwise
+
+        """
+
+        reset_byte_array = integer_to_bytearray(reset)
+        vol = float_to_bytearray(volume)
+        payload = reset_byte_array + vol
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dd_ch_id,
+                                              message_id=MsgIds.MSG_ID_DD_ACID_DOSING_VOLUME_OVERRIDE_REQUEST.value,
+                                              payload=payload)
+
+        if reset == RESET:
+            str_res = "reset back to normal"
+        else:
+            str_res = str(volume)
+        self.logger.debug("override acid dose volume to frequency " + ": " + str_res)
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.error("Timeout!!!!")
+            return False
+
+    def cmd_bicarb_dose_volume_override(self, volume: float, reset: int = NO_RESET) -> int:
+        """
+        Constructs and sends the bicarb dose volume override command
+        Constraints:
+            Must be logged into DD.
+
+        @param volume:  float - volume value to override bicarb dose with
+        @param reset:  integer - 1 to reset a previous override, 0 to override
+        @return: 1 if successful, zero otherwise
+
+        """
+
+        reset_byte_array = integer_to_bytearray(reset)
+        vol = float_to_bytearray(volume)
+        payload = reset_byte_array + vol
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dd_ch_id,
+                                              message_id=MsgIds.MSG_ID_DD_BICARB_DOSING_VOLUME_OVERRIDE_REQUEST.value,
+                                              payload=payload)
+
+        if reset == RESET:
+            str_res = "reset back to normal"
+        else:
+            str_res = str(volume)
+        self.logger.debug("override bicarb dose volume to frequency " + ": " + str_res)
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.error("Timeout!!!!")
+            return False
Index: leahi_dialin/dd/modules/piston_pump.py
===================================================================
diff -u -r9466b5c6b5867f392104a42608aa9542a7ff0358 -ra313166ac02fdc81a9d2b24eca45cded18fd468e
--- leahi_dialin/dd/modules/piston_pump.py	(.../piston_pump.py)	(revision 9466b5c6b5867f392104a42608aa9542a7ff0358)
+++ leahi_dialin/dd/modules/piston_pump.py	(.../piston_pump.py)	(revision a313166ac02fdc81a9d2b24eca45cded18fd468e)
@@ -168,4 +168,36 @@
             return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
         else:
             self.logger.error("Timeout!!!!")
+            return False
+
+    def cmd_piston_pump_fill_after_dispense_override(self, fill: bool, reset: int = NO_RESET) -> int:
+        """
+        Constructs and sends the piston pump fill after dispense override command
+        Constraints:
+            Must be logged into DD.
+
+        @param fill:  integer - 0 = false, 1 = true to override piston pump fill
+        @param reset:  integer - 1 to reset a previous override, 0 to override
+        @return: 1 if successful, zero otherwise
+        """
+
+        reset_byte_array = integer_to_bytearray(reset)
+        fl = integer_to_bytearray(fill)
+        payload = reset_byte_array + fl
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dd_ch_id,
+                                              message_id=MsgIds.MSG_ID_DD_PISTON_PUMP_FILL_AFTER_DISPENSE_OVERRIDE_REQUEST.value,
+                                              payload=payload)
+
+        self.logger.debug("override DD piston pump fill after dispense.")
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.error("Timeout!!!!")
             return False
\ No newline at end of file