Abstract: An electronic device is configured for use with neighboring electronic devices mounted on a DIN rail to control at least part of a Building Management System (BMS). The electronic device includes a housing and a plurality of communication passthroughs extending between two opposing sides of the housing. Each of the plurality of communication passthroughs include a contact disposed on each of the two opposing side of the housing, wherein each of the contacts is configured to electrically and mechanically couple to a corresponding contact of a neighboring electronic device on the DIN rail. A first subset of the plurality of communication passthroughs collectively pass a first communication bus between the two opposing sides of the housing and a second subset of the plurality of communication passthroughs collectively pass a second communication bus between the two opposing sides of the housing.