Index: SDDs/MainTreatmentScreen.puml
===================================================================
diff -u
--- SDDs/MainTreatmentScreen.puml	(revision 0)
+++ SDDs/MainTreatmentScreen.puml	(revision 1cb39a9b55c913ca9dd8dd4a521a6355db9643bc)
@@ -0,0 +1,46 @@
+@startuml MainTreatmentScreen
+
+    participant TD                  as TD
+    participant SW                  as SW
+    participant UI                  as UI
+
+    'Possible actions and interaction tuypes
+    ' TD -> 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.]
+
+    == Tx Time ==
+    TD -> SW: MSG: [x3B: #3] \nTD Treatment Time Data:\n(U32) txDurSecs\n(U32) txElapsedSec\n(U32) txRemainingSecs
+    SW -> UI: CMD: Update Treatment Time:\n(U32) txDurSecs\n(U32) txElapsedSec\n(U32) txRemainingSecs
+    == Tx Parameter set points ==
+    TD -> SW: MSG: [x4F: #3] \nTD treatment Set Points Data\n(U32) bloodFlow\n(U32) dialFlow\n(F32) dialTemp
+    SW -> UI: CMD: Update TX Set Points Data:\n(U32) bloodFlow\n(U32) dialFlow\n(F32) dialTemp
+    == Saline ==
+    TD -> SW: MSG: [x3D: #4] \nTD Saline Bolus Status Data\n(U32) ntgtVolMl\n(F32) cumVolMl\n(F32) bolVolMl\n(U32) sbState
+    SW -> UI: CMD: Update Saline Bolus Data\n(U32) ntgtVolMl\n(F32) cumVolMl\n(F32) bolVolMl\n(U32) sbState
+    == Ultrafiltration ==
+    TD -> SW: MSG: [x3E: #4] \nTD Ultrafiltration Status Data\n(F32) setVolL\n(F32) tgtRateLHr\n(F32) volDelL\n(U32) ufState
+    SW -> UI: CMD: Update UF Status\n(F32) setVolL\n(F32) tgtRateLHr\n(F32) volDelL\n(U32) ufState
+    == Pressures ==
+    TD -> SW: MSG: [x24: #12] \nTD Pressures Data\n(F32) artPress, \n(F32) venPres\n(U32) limitState\n(S32) artMin\n(S32) artMax\n(S32) venMin\n(s32) venMax\n(F32) artLong\n(U32) venLong\n(F32) tmpPress\n(F32) tmpMin\n(F32) tmpMax 
+    SW -> UI: CMD: Update TD Pressures\n(F32) artPress, \n(F32) venPres\n(U32) limitState\n(S32) artMin\n(S32) artMax\n(S32) venMin\n(s32) venMax\n(F32) artLong\n(U32) venLong\n(F32) tmpPress\n(F32) tmpMin\n(F32) tmpMax 
+    == Dialysate Conductivity ==
+    TD -> SW: MSG: [x1F: #5] \nDD Conductivity Data\n(F32) d17Cond\n(F32) d27Cond\n(F32) d29Cond\n(F32) d43Cond\n(F32) d74Cond
+    SW -> UI: CMD: Update Dial Conductivity\n(F32) d17Cond\n(F32) d27Cond\n(F32) d29Cond\n(F32) d43Cond\n(F32) d74Cond
+    == Gen Dialysate Mode ==
+    TD -> SW: MSG: [x2F: #9] \nDD GenD Mode Data\n(U32) GenDialisateExec\n(U32) isDDinProg\n(U32) d6level\n(U32) d63level\n(U32) d46level\n(F32) d9Pressure\n(F32) d18pressure\n(F32) d51pressure\n(U32) isDialGood
+    SW -> UI: CMD: Update GenD Mode Data\n(U32) GenDialisateExec\n(U32) isDDinProg\n(U32) d6level\n(U32) d63level\n(U32) d46level\n(F32) d9Pressure\n(F32) d18pressure\n(F32) d51pressure\n(U32) isDialGood
+
+
+@enduml
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