Creating timing diagram

Timing diagram shows time, event, space and signal for real-time and distributed system.

Creating timing diagram

Click on UML on toolbar and select Timing Diagram from the drop down menu.
Right click on Timing Diagram in Diagram Navigator and select New Timing Diagram from the popup menu.
Select File > New Diagram > UML Diagrams > Timing Diagram from the main menu.

Create timing diagram

Creating timing frame

To create timing frame, click Timing Frame on the diagram toolbar and then click on the diagram.

Create timing frame

Double click on the top left corner of the frame to rename it.

Rename frame

The name of a timing frame is usually preceded by the sd keyword.

Frame renamed

Adding lifeline to frame

To add lifeline to frame, right click the frame and select Add Lifeline from the pop-up menu.

Add lifeline

Double-click on the name of the lifeline to rename it.

Adding time unit to frame

To add time unit to frame, right click the frame and select Add Time Unit from the pop-up menu.

Add time unit

Repeat the step to add as many as time units you need. Double click on a time unit to rename it.

Rename time unit

Adding state/condition to lifeline

To add state/condition to lifeline, right click the lifeline and select Add State/Condition from the pop-up menu.

Add state/condition

Double click on the name of the state/condition to rename it.

Dragging time instance

Mouse over the line segment of a time instance, click and drag it.

Drag time instance

Release the mouse button when reached the target state/condition.

Dragged time instance

You can also move a group of time instances that are at the same state/condition. Mouse over the time instances and you will see a blue line above them, click and drag on the blue line.

Move a group of time instances

Release the mouse button when reached the target state/condition. The group of time instances is moved at once.

Moved group of time instances

Adding time messages to frame

To add time messages to frame, right-click the frame and select Edit Frame... from the pop-up menu.

Edit frame

In the Edit Frame dialog box, open the Time Messages tab and click Add... button.

Add time message

When the Add Time Message dialog box pops out, enter name and select the start lifeline, start time, end lifeline and end time for this time message. Note that as time units may be unnamed, when selecting start/end time you should check the relative position of the time unit in the list.

Select end time of time message

The time message is shown on the frame.

Time message

Adding duration constraint

Duration constraint is used to show the duration limitation of a particular lifeline over a period of time.

To set the duration constraints of a lifeline, right-click on the lifeline and select Edit Lifeline... from the pop-up menu.

Edit lifeline
In the Duration Constraints tab, click on the Add... button. In the Add Duration Constraint dialog box, select the appropriate Start time and End time from the drop down menu. Fills in the duration constraint of the selected time on the Constraint field. Click on the OK button to close the dialog box.

Add duration constraint
Click OK to return to diagram.

Duration constraint is added