Index: dialin/common/hd_defs.py
===================================================================
diff -u -r6320e78336f233a33b3c79f62bab7f37146f1a1c -rb3ccd0073b7c5ba27457a4b7cdd3e60b3a8d3d68
--- dialin/common/hd_defs.py	(.../hd_defs.py)	(revision 6320e78336f233a33b3c79f62bab7f37146f1a1c)
+++ dialin/common/hd_defs.py	(.../hd_defs.py)	(revision b3ccd0073b7c5ba27457a4b7cdd3e60b3a8d3d68)
@@ -111,4 +111,13 @@
 
 class HD_Pre_Treatment_Patient_Connection_States(DialinEnum):
     PATIENT_CONNECTION_STATE                        =  0 # Pre-treatment Patient Connection state.
-    NUM_OF_PATIENT_CONNECTION_STATES                =  1 # Number of pre-treatment Patient Connection states.
\ No newline at end of file
+    NUM_OF_PATIENT_CONNECTION_STATES                =  1 # Number of pre-treatment Patient Connection states.
+
+class HD_Standby_States(DialinEnum):
+    STANDBY_START_STATE                             = 0 # Start standby
+    STANDBY_WAIT_FOR_TREATMENT_STATE                = 1 # Wait for treatment
+    STANDBY_WAIT_FOR_DISINFECT_STATE                = 2 # Wait for disinfection
+    STANDBY_DG_FLUSH_IN_PROGRESS_STATE              = 3 # DG flush operation is in progress
+    STANDBY_DG_HEAT_DISINFECT_IN_PROGRESS_STATE     = 4 # DG heat disinfection operation is in progress
+    STANDBY_DG_CHEM_DISINFECT_IN_PROGRESS_STATE     = 5 # DG chemical disinfection operation is in progress
+    NUM_OF_STANDBY_STATES                           = 6 # Number of standby states (sub-modes)
\ No newline at end of file