Index: dialin/hd/ui_proxy.py
===================================================================
diff -u -r7e4d7c18db6fe196c164f6975fbf8062d9c41a3f -r3ef759269150e6d8001da1582e99554886ca0777
--- dialin/hd/ui_proxy.py	(.../ui_proxy.py)	(revision 7e4d7c18db6fe196c164f6975fbf8062d9c41a3f)
+++ dialin/hd/ui_proxy.py	(.../ui_proxy.py)	(revision 3ef759269150e6d8001da1582e99554886ca0777)
@@ -29,6 +29,7 @@
     """
     Hemodialysis Delivery (HD) Dialin API sub-class for ui commands.
     """
+    SW_COMPATIBILITY_REV = 1
 
     # misc definitions
     LITER_TO_ML_CONVERSION_FACTOR = 1000.0
@@ -1021,7 +1022,7 @@
         minor = unsigned_byte_to_bytearray(0)
         micro = unsigned_byte_to_bytearray(0)
         build = short_to_bytearray(0)
-        compatibility = integer_to_bytearray(1)
+        compatibility = integer_to_bytearray(SW_COMPATIBILITY_REV)
 
         payload = major + minor + micro + build + compatibility