An equipment control unit is composed of equipment control means for controlling the operation of an equipment, communication control means for controlling the transmission and reception of data to and from an external device, and transfer means for transferring the data between the equipment control...http://www.google.es/patents/US5488454?utm_source=gb-gplus-sharePatente US5488454 - Control of equipment and of communication with plural units of equipment
Control of equipment and of communication with plural units of equipment
