Index: dialin/hd/hemodialysis_device.py
===================================================================
diff -u -r61479ce1965fdcf793913f5e58af92e56c3aea67 -rd5c70c72d1cda8f85b5f77c58e56b996e80085bf
--- dialin/hd/hemodialysis_device.py	(.../hemodialysis_device.py)	(revision 61479ce1965fdcf793913f5e58af92e56c3aea67)
+++ dialin/hd/hemodialysis_device.py	(.../hemodialysis_device.py)	(revision d5c70c72d1cda8f85b5f77c58e56b996e80085bf)
@@ -47,6 +47,8 @@
     # broadcast message field positions
     START_POS_HD_OP_MODE = DenaliMessage.PAYLOAD_START_INDEX
     END_POS_HD_OP_MODE = START_POS_HD_OP_MODE + 4
+    START_POS_HD_SUB_MODE = END_POS_HD_OP_MODE
+    END_POS_HD_SUB_MODE = START_POS_HD_SUB_MODE + 4
 
     # HD login password
     HD_LOGIN_PASSWORD = '123'
@@ -86,6 +88,7 @@
 
         # create properties
         self.hd_operation_mode = self.HD_OP_MODE_INIT_POST
+        self.hd_operation_sub_mode = 0
 
         # Create command groups
         self.alarms = HDAlarms(self.can_interface)
@@ -109,8 +112,11 @@
         """
         mode = struct.unpack('i', bytearray(
             message['message'][self.START_POS_HD_OP_MODE:self.END_POS_HD_OP_MODE]))
+        smode = struct.unpack('i', bytearray(
+            message['message'][self.START_POS_HD_SUB_MODE:self.END_POS_HD_SUB_MODE]))
 
         self.hd_operation_mode = mode[0]
+        self.hd_operation_sub_mode = smode[0]
 
     def cmd_log_in_to_hd(self):
         """