Index: SDDs/Power_Control.png
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Index: SDDs/Power_Control.puml
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--- SDDs/Power_Control.puml	(revision 0)
+++ SDDs/Power_Control.puml	(revision 631dac140450713da60cf5bb938768382fbe2c44)
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+@startuml Power_Control
+    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
+
+    == Power Off Sequence ==
+    US -> TD: TCH: Press Hard Button - Power
+    TD -> SW: MSG: [xB7: #1] Power Off Request  \
+                \n\t(U32)  mStatus             
+    SW -> UI: ACT: Power Off Request
+    UI -> US: ACT: Display Confirm shutdown dialog
+    US -> UI: TCH: Press Shutdown or Cancel
+
+    alt shutdown
+    UI -> SW: ACT: Shutdown confirm response
+    SW -> TD: MSG: [xB6: #2]  Response      \
+                \n\t(U32) mId=0             \
+                \n\t(U32) mConfirm=1          
+    TD -> TD: ACT: Shutdown System
+    else #Pink cancel
+        UI -> US: ACT: Close Dialog
+    end
+
+@enduml