Index: dialin/hd/ui_proxy.py
===================================================================
diff -u -rcd24d55a5ed87035a19f38b44d1d49f61a186a3b -r089bdbd0666ffeef307621beb61d8a2e429b1a30
--- dialin/hd/ui_proxy.py	(.../ui_proxy.py)	(revision cd24d55a5ed87035a19f38b44d1d49f61a186a3b)
+++ dialin/hd/ui_proxy.py	(.../ui_proxy.py)	(revision 089bdbd0666ffeef307621beb61d8a2e429b1a30)
@@ -37,6 +37,8 @@
     MSG_ID_TREATMENT_DURATION_SETTING_CHANGE_RESPONSE_FROM_HD = 0x001B
     MSG_ID_BLOOD_DIALYSATE_FLOW_SETTING_CHANGE_REQUEST_BY_USER = 0x0017
     MSG_ID_BLOOD_DIALYSATE_FLOW_SETTING_CHANGE_RESPONSE_FROM_HD = 0x0018
+    MSG_ID_UI_REQUEST_HD_VERSION = 0x001C
+    MSG_ID_UI_HD_VERSION_RESPONSE = 0x001D
 
     LITER_TO_ML_CONVERSION_FACTOR = 1000.0
     UF_CMD_PAUSE = 0
@@ -46,6 +48,14 @@
     RESPONSE_REJECTED = 0
     RESPONSE_ACCEPTED = 1
 
+    # HD version message field positions
+    START_POS_MAJOR = DenaliMessage.PAYLOAD_START_INDEX
+    END_POS_MAJOR = START_POS_MAJOR + 1
+    START_POS_MINOR = END_POS_MAJOR
+    END_POS_MINOR = START_POS_MINOR + 1
+    START_POS_BUILD = END_POS_MINOR
+    END_POS_BUILD = START_POS_BUILD + 2
+
     # HD update on valid treatment parameter ranges message field positions
     START_POS_MIN_TREAT_TIME = DenaliMessage.PAYLOAD_START_INDEX
     END_POS_MIN_TREAT_TIME = START_POS_MIN_TREAT_TIME + 4
@@ -118,7 +128,11 @@
                                                                   self.handler_blood_and_dialysate_change_response)
             self.can_interface.register_receiving_publication_function(channel_id, self.MSG_ID_HD_TREATMENT_PARAMS_RANGES,
                                                                   self.handler_treatment_param_ranges)
+            self.can_interface.register_receiving_publication_function(DenaliChannels.hd_to_ui_ch_id, self.MSG_ID_UI_HD_VERSION_RESPONSE,
+                                                                  self.handler_hd_version)
 
+        # initialize variables that will be populated by HD version response
+        self.hd_version = ''
         # initialize variables that will be populated by treatment parameter ranges message
         self.min_treatment_duration_min = 0
         self.max_treatment_duration_min = 0
@@ -145,6 +159,26 @@
         self.target_blood_flow_rate = 0
         self.target_dialysate_flow_rate = 0
 
+    def handler_hd_version(self, message):
+        """
+        Handler for response from HD regarding its version.
+
+        \param message:  response message from HD regarding valid treatment parameter ranges.\n
+            U08  Major \n
+            U08  Minor \n
+            U16  Build \n
+
+        \returns none
+        """
+        major = struct.unpack('B', bytearray(
+            message['message'][self.START_POS_MAJOR:self.END_POS_MAJOR]))
+        minor = struct.unpack('B', bytearray(
+            message['message'][self.START_POS_MINOR:self.END_POS_MINOR]))
+        build = struct.unpack('H', bytearray(
+            message['message'][self.START_POS_BUILD:self.END_POS_BUILD]))
+
+        self.hd_version = 'v'+str(major)+'.'+str(minor)+'.'+str(build)
+
     def handler_treatment_param_ranges(self, message):
         """
         Handler for response from HD regarding valid treatment parameter ranges.
@@ -293,6 +327,22 @@
 
         return 0
 
+    def cmd_ui_request_hd_version(self):
+        """
+        Constructs and sends the ui request for version message
+
+        \returns 0
+        """
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_hd_ch_id,
+                                              message_id=self.MSG_ID_UI_REQUEST_HD_VERSION)
+
+        print("Sending ui request for version to HD")
+
+        self.can_interface.send(message, 0)
+
+        return 0
+
     def cmd_ui_uf_pause_resume(self, cmd=UF_CMD_PAUSE):
         """
         Constructs and sends a ui UF command message