@startuml title Zeitdiagramm (Timing Diagram) clock clk with period 1 concise "Activity" as C robust "State" as R binary "System" as B1 binary "User" as B2 @0 C is Idle R is Idle B2 is high @1 C is Login R is Processing B1 is high B2 is low R -> C : password @3 R is Server @4 R is Processing C -> R@+0.5 : answer @5 C is Idle R is Idle B1 is low B2 is high @enduml