Index: leahi_dialin/td/proxies/ui_proxy.py
===================================================================
diff -u -r4c6191b3a68f1167a0e443c975c51f3cb00b8000 -rf67b42d75954b722ae56eb8abc5facdbee636477
--- leahi_dialin/td/proxies/ui_proxy.py	(.../ui_proxy.py)	(revision 4c6191b3a68f1167a0e443c975c51f3cb00b8000)
+++ leahi_dialin/td/proxies/ui_proxy.py	(.../ui_proxy.py)	(revision f67b42d75954b722ae56eb8abc5facdbee636477)
@@ -19,14 +19,17 @@
 from leahi_dialin.common.msg_defs import MsgIds, MsgFieldPositions
 from leahi_dialin.protocols.CAN import DenaliMessage, DenaliCanMessenger, DenaliChannels
 from leahi_dialin.utils.base import AbstractSubSystem, publish
-from leahi_dialin.utils.conversions import integer_to_bytearray, byte_to_bytearray, float_to_bytearray
+from leahi_dialin.utils.conversions import integer_to_bytearray, unsigned_byte_to_bytearray, float_to_bytearray, \
+                                        short_to_bytearray
 
 
 class UIProxy(AbstractSubSystem):
     """
     Treatment Delivery (TD) Dialin API sub-class for UI proxy ( injection ) related commands.
     """
 
+    SW_COMPATIBILITY_REV = 0
+
     def __init__(self, can_interface: DenaliCanMessenger, logger: Logger):
         """
         DDProxy constructor
@@ -252,9 +255,17 @@
 
         @return: none
         """
+        major = unsigned_byte_to_bytearray(0)
+        minor = unsigned_byte_to_bytearray(0)
+        micro = unsigned_byte_to_bytearray(0)
+        build = short_to_bytearray(0)
+        compatibility = integer_to_bytearray(self.SW_COMPATIBILITY_REV)
 
+        payload = major + minor + micro + build + compatibility
+
         message = DenaliMessage.build_message(channel_id=DenaliChannels.ui_sync_broadcast_ch_id,
-                                              message_id=MsgIds.MSG_ID_FW_VERSIONS_REQUEST.value)
+                                              message_id=MsgIds.MSG_ID_FW_VERSIONS_REQUEST.value,
+                                              payload=payload)
 
         self.logger.debug("Sending UI Version Request.")
         self.can_interface.send(message, 0)