US 5,398,932 · Granted 1995-03-21

Video lottery system with improved site controller and validation unit

A video lottery system for playing electronic games on multiple video lottery terminals. The system includes a central computer at a central site and at least one gaming site remotely located from the central computer. The gaming site includes a plurality of video lottery terminals which play games and generate cash tickets representing an amount won during game play. The terminals are organized into groups, each of which is managed by a site controller connected thereto. The site controllers communicate with one another via a site management ring. A unique communications protocol used on the management ring allows multiple types of logical devices (also called ring devices) to communicate with one another along the ring. Each site controller authorizes terminals within a corresponding group of terminals to generate cash tickets and is capable of validating every cash ticket generated within the video lottery system. The site controllers emulate several logical devices including a cash ticket validation console, a terminal polling device and a ring issuing device. The site controllers and terminals communicate via encrypted messages for security purposes. This encryption system uses multiple encryption and decryption keys at each terminal and site controller. The site controllers perform triple redundancy information storage to ensure the integrity of the ticketing information therein.

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