A disclosed gaming machine is coupled to a plurality of “USB gaming peripherals.” The USB gaming peripherals, which may include one or more peripheral devices, communicate with a master gaming controller using a USB communication architecture. The USB communication architecture may include a vendor-specific...http://www.google.es/patents/US7290072?utm_source=gb-gplus-sharePatente US7290072 - Protocols and standards for USB peripheral communications
Protocols and standards for USB peripheral communications
