OpenBus Tutorial - Linking System Components
We have placed the required devices for the system, now it's time to wire them all together. In the OpenBus System, two components are connected to each other using a single link, referred to as an OpenBus link. Links are made between ports of devices, with direction always being from a master port (red) to a slave port (green).
Links can be added by clicking on the 
button on the OpenBus toolbar (or by using the Place » Link OpenBus Ports command). A link is deleted simply by selecting it and pressing the Delete key.
When you enter link addition mode, all currently unlinked ports will be filtered, with all other elements in the system dimmed. If you click to start a link on a master port, all currently unlinked slave ports will be filtered and available for choosing the termination point of the link. Conversely, if you click to start a link from a slave port, all currently unlinked master ports will be filtered and made available.
You can start the link from either a master port or a slave port – the direction of the link itself will always be made to go from master to slave.
Note: A link can be graphically modified by selecting it and using its editing handle(s) to adjust its shape.
Go ahead and add links between the devices, as shown in Figure 1.
Figure 1. All components in the OpenBus System fully linked.