Understanding Interface Modeling in SysML

In the world of SysML, there are numerous methods to model interfaces. This post will delve into the practical demonstration of modeling a box connected to a TV and explore the different ways to model both a logical breakdown and a physical breakdown. The aim here is to help you understand the various methods and guide you in determining the best approach for your specific situation.

Logical Breakdown

The logical breakdown starts with a simple home TV setup context with two subsystems: the box and the TV. The initial step involves creating an internal block diagram to connect these subsystems. Power coming from the external source is used to supply both the box and TV. As the breakdown progresses, details such as signals for data and power are added. Proxy ports are then introduced to the box and the TV, followed by the typing of these proxy ports using interface blocks. This process involves creating interface blocks to type the proxy ports and adding flow ports typed by signals.

Physical Design Details

Moving on to the physical design, specific details about the box and TV setup are provided. This includes the exact power cable used to power the box, the HDMI cable connecting the box to the TV, and the power source for the TV. The details of the HDMI connector pinout and the signals transmitted over the pins are also discussed.

Alternative Methods

Three alternative methods are presented, each with its own distinctions. Option A does not incorporate the HDMI and power cables as part properties, while Option B includes these cables as harnesses under the TV setup context. Option C introduces the use of an association block to represent the HDMI and power cables.

Modeling the Alternatives

The modeling of each alternative is systematically explained, encompassing the addition of proxy ports, the creation of interface blocks to type the proxy ports, and the inclusion of specific signals over the connectors as item flows. The differences between alternative A and B are highlighted, emphasizing the level of detail required and the consequences of each approach.

Pinout Level Modeling

The post delves into the modeling of pinouts and connector level connections, illustrating the steps involved in adding flow properties and the significance of different views to depict the details comprehensively.

Adding Flow Properties

The process of adding flow properties to the models is detailed, along with the significance of arrows on proxy ports for compatibility validation. The inclusion of detailed views for a more comprehensive understanding is also explored.

Conclusion

In conclusion, this post provides an in-depth insight into the modeling of interfaces in SysML, conveying the importance of understanding the diverse methods available for logical and physical breakdowns. By presenting alternative approaches and discussing the implications of each, this content aims to empower readers to make informed decisions when modeling interfaces in SysML.