Index: SDDs/SystemInformation.puml
===================================================================
diff -u
--- SDDs/SystemInformation.puml	(revision 0)
+++ SDDs/SystemInformation.puml	(revision e465ba26f37e1bacdcd6f14082294900e636bcce)
@@ -0,0 +1,40 @@
+@startuml SystemInformationScreen
+
+    participant TD                  as TD
+    participant DD                  as DD
+    participant SW                  as SW
+    ' participant OS                  as OS
+    ' participant Script              as Script
+    participant UI                  as UI
+    actor       USER                as US
+
+    'Possible actions and interaction types
+    ' TD -> SW: MSG: Message
+    ' DD -> SW: MSG: Message
+    ' SW -> TD: MSG: Message
+    ' SW -> UI: CMD: command
+    ' UI -> SW: ACT: Action
+    ' US -> UI: User actions are:
+    '   ENT: User enters a value or string
+    '   TCH: User touches a button (RadioButton, CheckBox, ...)
+    '   SET: User sets/slides a slider
+    '   SCL: User scrolls a flipable area
+    '
+    'Messages conventions:
+    '[x<hex message ID> <Req/Rsp/Dat>  \n  <P1>,<P..>]
+    '[x<hex message ID> <Req/Rsp/Dat>  \n  <P1>,# certain amount of parameters according to the content]
+    '[x<hex message ID> <Req/Rsp/Dat>  \n  <P1>,X The rest of the parameters do not matter.]
+
+    == System Information ==
+    US -> UI: TCH: Device Settings, Information Button
+    UI -> SW: MSG: [x0D: #5] F/W versions request\n(U08) UI major\n(U08) UI minor\n(U08) UI micro\n(U16) UI build\n(U32) UI Compatibility
+    SW -> TD: MSG: [x0D: #5]
+    SW -> DD: MSG: [x0D: #5]
+    TD -> SW: MSG: [x0E: #5] TD f/w version response\n(U08) TD major\n(U08) UI minor\n(U08) UI micro\n(U16) UI build\n(U32) UI Compatibility 
+    TD -> SW: MSG: [x??: #1] Water Configuration
+    TD -> SW: MSG: [x??: #?] Service Dates\n(U32) Next Service Date\n(U32) Last Service Date
+    DD -> SW: MSG: [x0F: #5] DD f/w version response\n(U08) UI major\n(U08) UI minor\n(U08) UI micro\n(U16) UI build\n(U32) UI Compatibility 
+    SW -> UI: CMD: System Information Screen
+
+
+@enduml
\ No newline at end of file
Index: SDDs/SystemInformationScreen.png
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