Use Case:  Control Relay Optics Structure Shutter

Description:  Open/Close the shutter of the Relay Optics Structure

Role(s)/Actor(s): 
Primary: Operator, Maintenance
Secondary: ROS Shutter

Priority: Major

Performance: TBD

Frequency: At any time, mainly during AT System Start/Stop.

Package Assignment:  Relay Optics Shutter Subsystem.

Preconditions: 

• ROS Shutter is available and ONLINE

Basic Course: 

• Send command OPEN | CLOSE to control the ROS Shutter
  Exception Course: Command failed
• ATCS performs for the ROS Shutter:
  • Subflow: Open Shutter
  • Subflow: Close Shutter
  Exception Course: Communication failed Exception Course: Command failed
• ATCS returns OK reply

Subflow: Open Shutter

• ATCS opens the ROS Shutter

  Interface:  IfRosShutter.Control.Open

  Postcondition: Shutter Open

  Interface:  IfRosShutter.Status.Open

Subflow: Close Shutter

• ATCS closes the ROS Shutter

  Interface:  IfRosShutter.Control.Close

  Postcondition: Shutter Closed

  Interface:  IfRosShutter.Status.Close

Exception Course: Communication failed

• ATCS set the module to state LOADED subState Error - Not Initialized
• ATCS returns ERROR reply

Exception Course: Command failed

• ATCS returns ERROR reply

Postconditions: 

• ROS Shutter is in requested state

Issues to be Determined or Resolved: 

Notes:

Last modified: Wed Nov 28 14:10:56 UTC 2001