Self-addressing control units and modular sign including plurality of self-addressing control units

A self-addressing control unit comprising:

• associated with a portion of a display sign sequence or array in a self-addressing control unit system for controlling the sequence or array,
• said system having 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 said electrical bus further comprises a main broadcast line, an addressing line and a feedback line to every control unit,
• said control unit comprising:
• a) a receiver that receives an initial address from an immediately preceding control unit in the system along the addressing line;
• b) a master or remote controller electrically interconnected with the plurality of control units by the electrical bus,
• wherein the master or remote controller transmits an initial address to a first of the plurality of control units on the addressing line of the bus;
• transmits data on the main broadcast line;
• and assigns an address to blocks of data, wherein each said assigned address represents the address of the control unit that processes the block of data;
• c) a communication device associated with the master or remote controller for communicating a signal to the plurality of control units along the main broadcast line;
• d) a calculator or computer that computes a new address for the control unit by performing a mathematical operation that changes the initial address received from the immediately preceding control unit via the addressing line,
• wherein the mathematical operation comprises adding a constant of one to the address received to produce its own new address;
• e) a non-volatile memory storage that stores its new address;
• and,
• f) a transmitter that sends its new address to a next subsequent control unit via the addressing line, and sends data blocks from every control unit to the master or remote controller over the main broadcast line when the address of that control unit is specified by the master or remote controller;
• whereupon when one of said plurality of control units fails, a new or replacement control unit will be installed and automatically re-address itself in the system whenever it receives the initial address from the immediately preceding control unit, performing the mathematical operation on that initial address to produce a new address, and storing the new address in the memory as its newly presented address in the control unit.

A method of networking a plurality of self-addressing control units for controlling a sequence of or an array of display signs comprising:

• a) providing a plurality of control units each containing a non-volatile memory storage and each associating with a portion of the display sign array and all electrically interconnecting by a physical or logical parallel electrical bus having multiple connections, wherein said electrical bus further comprises a main broadcast line, an addressing line and a feedback line to every control unit, and said electrical bus transfers data or power between the control units;
• b) providing a master or remote control electrically interconnecting with the plurality of control units by the electrical bus;
• c) communicating with the master or remote controller for communicating a signal to the plurality of control units along the electrical bus by sending a system start-up signal from the controller along the main broadcast line to the plurality of control units
• wherein the master or remote controller transmits an initial address to a first of the plurality of control units on the addressing line of the bus;
• transmits data on the main broadcast line;
• and assigns an address to blocks of data, wherein each said assigned address represents the address of the control unit that processes the block of data;
• d) causing each control unit to calculate an address associated with that control unit by receiving the initial address from an immediately preceding control unit, performing a mathematical operation on the initial address received to create a new address,
• wherein the mathematical operation comprises adding a constant of one to the received address to produce its own new address;
• e) storing the new address in its non-volatile memory storage, and transmitting the new address to a next subsequent control unit via the addressing line and sending data blocks from every control unit to the master or remote controller over the main broadcast line when the address of that control unit is specified by the master or remote controller;
• and
• f) re-addressing whereupon one of said plurality of control units fails, a new or replacement unit will be installed and automatically re-address itself in the system by receiving the initial address from the immediately preceding control unit, performing the mathematical operation on that initial address to produce a new address, and storing the new address in the memory as its newly presented address in the control unit system.