@startuml
hide footbox
title Patient Encounter Management (ITI-31)
participant PES as "PES\n(SUT)" 
participant PEC as "PEC\n(Patient Manager)" #99FF99
PES -> PEC: ADT message (ex: ADT^A01^ADT_A01)
activate PEC
PEC --> PES: ACK
deactivate PEC
@enduml