Index: SDDs/HDF.png
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Index: SDDs/HDF.puml
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--- SDDs/HDF.puml	(revision 0)
+++ SDDs/HDF.puml	(revision 7a707330ea36ffc9b91f04b42122cc24a966388d)
@@ -0,0 +1,52 @@
+@startuml HDF
+    participant TD                  as TD
+    participant SW                  as SW
+    participant UI                  as UI
+    actor       USER                as US
+
+    'Possible actions and interaction types
+    ' External on CANBus
+    ' TD -> SW: MSG: Message
+    ' SW -> TD: MSG: Message
+
+    ' Internal to the application
+    ' XX -> YY: CMD: Command
+    ' XX -> XX: ACT: Action
+
+    ' External on OS/FS
+    ' SW -> Script: ACT: Command
+    ' Script -> OS: CMD: Command
+    ' Script -> SW: MSG: Message
+    ' OS -> Script: MSG: Message
+
+    ' US -> UI: User actions are:
+    '   ASK: Display a <message>
+    '   ENT: User enters a value or string
+    '   TCH: User touches a button (RadioButton, CheckBox, ...)
+    '   SCL: User scrolls a flip-able area
+
+
+  == Main TX HDF ==
+    UI ->o UI: ⟲: Main Treatment Screen
+    US -> UI: TCH: HDF Menu Option
+    UI -> US: ACT: Display HDF Screen   \
+                    \n\t  - Pressures   \
+                    \n\t  - Pressures Graph \
+                    \n\t  - HDF
+    group Pressures Data
+        TD --> UI: ...
+    end
+    UI -> US: ACT: Show Pressures Data BroadCast
+    group Plot Timer (1 min)
+        UI --> UI: ...
+    end
+    UI -> SW: ACT: Request HDF Data
+    SW -> TD: ACT: Request HDF Data
+    TD -> SW: ACT: Response HDF Data
+    SW -> UI: ACT: Response HDF Data
+    UI -> US: ACT: Display HDF Data
+
+ == Pressures Data ==
+    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 
+@enduml