I need to distribute a home automation system along multiple lines. Which line should I connect to with the software to perform the general configuration of all the devices in the system?

The software must configure the system as the control unit would, so it is a good idea to connect the interface to the BUS of the same line as the main control unit. The line you need to connect the interface to is generally the main backbone line of the system, which gives you access to all the secondary lines as well.