The CAN-bus takes care of the transfer of the digital data between the various modules.
The system operates bi-directionally and interactively, which means that each action is seen by any one module. Each module talks thus directly with another module. The plug-and-play system ensures that the user can add and remove modules without having to mess with addresses. Addressing is thus fully automatic.
For the bus, use is made of a shielded FTP (foiled twisted pair) cable (category 5e).