Index: dialin/common/hd_defs.py
===================================================================
diff -u -r0e68ec6bb733a8ab7b21a82f8b571f1678f9d2cd -r5721e7bc130ed5e14b4f516e8bbc3836563bbe98
--- dialin/common/hd_defs.py	(.../hd_defs.py)	(revision 0e68ec6bb733a8ab7b21a82f8b571f1678f9d2cd)
+++ dialin/common/hd_defs.py	(.../hd_defs.py)	(revision 5721e7bc130ed5e14b4f516e8bbc3836563bbe98)
@@ -346,7 +346,8 @@
     HD_EVENT_RSRVR_1_LOAD_CELL_END_VALUES                   = 15    # HD reservoir 2 load cells end values
     HD_EVENT_RSRVR_2_LOAD_CELL_START_VALUES                 = 16    # HD reservoir 2 load cells start values
     HD_EVENT_RSRVR_2_LOAD_CELL_END_VALUES                   = 17    # HD reservoir 2 load cells end values
-    NUM_OF_EVENT_IDS                                        = 18    # Total number of HD events
+    HD_EVENT_SUB_STATE_CHANGE                               = 18    # HD Op sub-state change event
+    NUM_OF_EVENT_IDS                                        = 19    # Total number of HD events
 
 
 @unique