A system includes a plurality of controllers associated with the plurality of units of building equipment, each controller comprising a plurality of communication ports, a plurality of cables connected to the plurality of communication ports and linking together the plurality of controllers, wherein the plurality of controllers are configured to self-identify a break in a connection between two the plurality of controllers by monitoring statuses of the plurality of communication ports. The system also includes circuitry configured to receive a signal indicative of the order of the connections between the plurality of controllers from the plurality of controllers, generate a graphical map of the order of the connections between the plurality of controllers based on the signal, receive, from the plurality of controllers, an indication of a break in a connection between two of the plurality of controllers, and update the graphical map to indicate the connection as broken.