Abstract: A self-addressing control unit system and method for controlling a sequence of or an array of display signs comprising of a remote or master controller and a plurality of control units interconnected by a physical or logical parallel electrical bus having multiple connections to transfer data or power between the plurality of control units; wherein the electrical bus further comprises of a main broadcast line, an addressing line and a feedback line to every control unit. The remote or master controller transmits an initial address to a first of the plurality of control units on the addressing line of the bus where a calculator or computer within each of the plurality of control units computes its own address by performing a mathematical operation that changes the initial address by adding a constant of one to the address received to produce its own new address.