Index: DDDefs.h
===================================================================
diff -u -r481e12ee7f4d984489fcf7da24a1f8a8932f34ec -r714964d387176ddfb62cf06c424aa61eb5b9be5e
--- DDDefs.h	(.../DDDefs.h)	(revision 481e12ee7f4d984489fcf7da24a1f8a8932f34ec)
+++ DDDefs.h	(.../DDDefs.h)	(revision 714964d387176ddfb62cf06c424aa61eb5b9be5e)
@@ -541,17 +541,27 @@
 };
 typedef enum Bicarb_Chamber_F_Fill_Exec_States BICARB_CHAMBER_FILL_EXEC_STATE_T;  ///< Type for bicarb chamber fill exec state enumeration
 
-/// Enumeration of Bicarb chmaber drain mode exec states
+/// Enumeration of DryBicart drain exec states
 enum Dry_Bicart_Drain_Exec_States
 {
-    DRY_BICART_DRAIN_START_STATE = 0,                                 ///< Initial state of dry bicart drain
-    DRY_BICART_FLUID_DRAIN_STATE,                                     ///< Dry bicart fluid drain state
-    DRY_BICART_FLUID_DRAIN_DURATION_CHECK_STATE,                      ///< Dry bicart drain duration check state
-    DRY_BICART_FLUID_DRAIN_END_STATE,                                 ///< Dry bicart drain end state
+    DRY_BICART_DRAIN_START_STATE = 0,                                ///< Initial state of dry bicart drain
+    DRY_BICART_FLUID_DRAIN_STATE,                                    ///< Dry bicart fluid drain state
+    DRY_BICART_FLUID_DRAIN_DURATION_CHECK_STATE,                     ///< Dry bicart drain duration check state
+    DRY_BICART_FLUID_DRAIN_END_STATE,                                ///< Dry bicart drain end state
     NUM_OF_DRY_BICART_DRAIN_EXEC_STATES
 };
 typedef enum Dry_Bicart_Drain_Exec_States DRY_BICART_DRAIN_EXEC_STATE_T;    ///< Type for dry bicart fill exec state enumeration
 
+/// Enumeration of drybicart depressurise exec states
+enum Dry_Bicart_Depressurise_Exec_States
+{
+    DRY_BICART_DEPRESSURISE_START_STATE = 0,                         ///< Initial state of dry bicart depressurise
+    DRY_BICART_DEPRESSURISE_VENT_START_STATE,                        ///< Dry bicart depressurise vent start state
+    DRY_BICART_DEPRESSURISE_VENT_END_STATE,                          ///< Dry bicart depressurise vent end state
+    NUM_OF_DRY_BICART_DEPRESSURISE_EXEC_STATES
+};
+typedef enum Dry_Bicart_Depressurise_Exec_States DRY_BICART_DEPRESSURISE_EXEC_STATE_T;    ///< Type for dry bicart depressurise exec state enumeration
+
 /// Enumeration of conductivity sensors.
 enum Conductivity_Sensors
 {
Index: MsgDefs.h
===================================================================
diff -u -r58f3b98b7cb8f22808b5684a4ea3ee8e8259a8be -r714964d387176ddfb62cf06c424aa61eb5b9be5e
--- MsgDefs.h	(.../MsgDefs.h)	(revision 58f3b98b7cb8f22808b5684a4ea3ee8e8259a8be)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 714964d387176ddfb62cf06c424aa61eb5b9be5e)
@@ -420,6 +420,7 @@
     MSG_ID_DD_CONDUCTIVITY_SENSOR_CAL_RESPONSE = 0xA071,                                ///< DD conductivity sensor cal response
     MSG_ID_DD_MIXING_CONTROL_DATA = 0xA072,                                             ///< DD mixing control publish data 
     MSG_ID_DD_MIXING_CONTROL_DATA_PUBLISH_INTERVAL_OVERRIDE_REQUEST = 0xA073,           ///< DD DD mixing control broadcast data overrride request
+    MSG_ID_DD_BICART_DEPRESSURISE_REQUEST_OVERRIDE_REQUEST = 0xA074,                    ///< DD dry bicart depressurise overrride request
 
     MSG_ID_FIRST_FP_TESTER_MESSAGE = 0xB000,                                            ///< First FP test message ID
     MSG_ID_FP_TESTER_LOGIN_REQUEST = MSG_ID_FIRST_FP_TESTER_MESSAGE,                    ///< FP tester log-in