Index: dialin/dg/dialysate_generator.py
===================================================================
diff -u -r17704a8e40bbc201bbf46712891b99fffb798e7c -rbc2938a08b77bf1a26d1d6de59797aaa2a5124fc
--- dialin/dg/dialysate_generator.py	(.../dialysate_generator.py)	(revision 17704a8e40bbc201bbf46712891b99fffb798e7c)
+++ dialin/dg/dialysate_generator.py	(.../dialysate_generator.py)	(revision bc2938a08b77bf1a26d1d6de59797aaa2a5124fc)
@@ -83,6 +83,8 @@
     # HD login password
     DG_LOGIN_PASSWORD = '123'
 
+    SW_COMPATIBILITY_REV = 1
+
     # DG version message field positions
     START_POS_MAJOR = DenaliMessage.PAYLOAD_START_INDEX
     END_POS_MAJOR = START_POS_MAJOR + 1
@@ -343,7 +345,7 @@
         minor = unsigned_byte_to_bytearray(0)
         micro = unsigned_byte_to_bytearray(0)
         build = short_to_bytearray(0)
-        compatibility = integer_to_bytearray(0)
+        compatibility = integer_to_bytearray(self.SW_COMPATIBILITY_REV)
 
         payload = major + minor + micro + build + compatibility
 
Index: dialin/hd/ui_proxy.py
===================================================================
diff -u -rd267c69084642a4aad216769294fe881b1ed1cc4 -rbc2938a08b77bf1a26d1d6de59797aaa2a5124fc
--- dialin/hd/ui_proxy.py	(.../ui_proxy.py)	(revision d267c69084642a4aad216769294fe881b1ed1cc4)
+++ dialin/hd/ui_proxy.py	(.../ui_proxy.py)	(revision bc2938a08b77bf1a26d1d6de59797aaa2a5124fc)
@@ -30,6 +30,7 @@
     """
     Hemodialysis Delivery (HD) Dialin API sub-class for ui commands.
     """
+    SW_COMPATIBILITY_REV = 1
 
     # misc definitions
     LITER_TO_ML_CONVERSION_FACTOR = 1000.0
@@ -1022,7 +1023,7 @@
         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(self.SW_COMPATIBILITY_REV)
 
         payload = major + minor + micro + build + compatibility