Index: dialin/common/msg_defs.py
===================================================================
diff -u -r3559c80a045fc8cb5f2d994930284b435f939caf -re4d086bbac8a1e894c2baa5599a0efd6a65b4248
--- dialin/common/msg_defs.py	(.../msg_defs.py)	(revision 3559c80a045fc8cb5f2d994930284b435f939caf)
+++ dialin/common/msg_defs.py	(.../msg_defs.py)	(revision e4d086bbac8a1e894c2baa5599a0efd6a65b4248)
@@ -158,6 +158,7 @@
     MSG_ID_DIAL_OUT_PUMP_HOME_CMD = 0x8039                      # Dialysate outlet pump home command
     MSG_ID_SUPER_CLEAR_ALARMS_CMD = 0x803A                      # Clears all alarms (even if non-recoverable or fault)
     MSG_ID_HD_REQUEST_CALIBRATION_DATA = 0x803B                 # Requests calibration data from HD
+    MSG_ID_HD_ERASE_CALIBRATION_DATA = 0x803C                   # Requests calibration data on HD be erased
 
     MSG_ID_FIRST_DG_TESTER_MESSAGE = 0xA000                     # First DG test message ID
     MSG_ID_DG_TESTER_LOGIN_REQUEST = MSG_ID_FIRST_DG_TESTER_MESSAGE  # DG tester log-in
Index: dialin/hd/hemodialysis_device.py
===================================================================
diff -u -r1454a1ae9ab6d66750269d471048ffe52c5786de -re4d086bbac8a1e894c2baa5599a0efd6a65b4248
--- dialin/hd/hemodialysis_device.py	(.../hemodialysis_device.py)	(revision 1454a1ae9ab6d66750269d471048ffe52c5786de)
+++ dialin/hd/hemodialysis_device.py	(.../hemodialysis_device.py)	(revision e4d086bbac8a1e894c2baa5599a0efd6a65b4248)
@@ -126,6 +126,14 @@
         """
         return self.hd_operation_mode
 
+    def get_hd_calibration_data(self):
+        """
+        Gets the HD calibration record
+
+        @return: The hd calibration record
+        """
+        return self.hd_calibration_data
+
     @_publish(["hd_calibration_data"])
     def _handler_hd_cal_data_sync(self, message):
         """
@@ -206,6 +214,67 @@
             self.logger.debug("Login Timeout!!!!")
             return False
 
+    def cmd_hd_request_calibration_data(self):
+        """
+        Constructs and sends an HD calibration data request command via CAN bus.
+        Constraints:
+            Must be logged into HD.
+
+        \returns response message if received, False if no response received
+
+        @return: 1 if successful, zero otherwise
+
+        """
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_hd_ch_id,
+                                              message_id=MsgIds.MSG_ID_HD_REQUEST_CALIBRATION_DATA.value)
+
+        self.logger.debug("requesting HD calibration data.")
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        if received_message is not None:
+            if received_message['message'][DenaliMessage.PAYLOAD_START_INDEX] == 1:
+                self.logger.debug("HD calibration data request accepted.")
+            else:
+                self.logger.debug("HD calibration data request failed.")
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
+            return False
+
+    def cmd_hd_erase_calibration_data(self):
+        """
+        Constructs and sends an erase HD calibration data request command via CAN bus.
+        Constraints:
+            Must be logged into HD.
+
+        \returns response message if received, False if no response received
+
+        @return: 1 if successful, zero otherwise
+
+        """
+        key = integer_to_bytearray(-758926171)   # 0xD2C3B4A5
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_hd_ch_id,
+                                              message_id=MsgIds.MSG_ID_HD_ERASE_CALIBRATION_DATA.value,
+                                              payload=key)
+
+        self.logger.debug("requesting HD calibration data be erased.")
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        if received_message is not None:
+            if received_message['message'][DenaliMessage.PAYLOAD_START_INDEX] == 1:
+                self.logger.debug("HD calibration data erasure request accepted.")
+            else:
+                self.logger.debug("HD calibration data erasure request failed.")
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
+            return False
+
     def cmd_hd_safety_shutdown_override(self, active=True, reset=NO_RESET):
         """
         Constructs and sends an HD safety shutdown override command via CAN bus.