The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 1998
Filed:
Dec. 20, 1996
Roger W Ratz, Naperville, IL (US);
Randy D Pfeifer, Warrenville, IL (US);
NCR Corporation, Dayton, OH (US);
Abstract
There is disclosed a telephone instrument having controller and audio unit portions coupled together by a control bus and a user data bus having four audio states. The audio unit portion comprises a state machine that allows operating modes of the telephony instrument to be monitored and controlled. The state machine places the user data bus in a first predetermined state and the controller portion responds by placing the control bus in a selected state. The state machine detects the selected state and, in response thereto, places the user data bus in a second predetermined state. The second predetermined state indicates whether the first predetermined state was intended to be one of the four audio states or one of at least two mode control states. The user data bus and the control bus cooperate to provide a sequential output having at least six states, thereby allowing the operating modes to be monitored and controlled without modifying the bus drive circuitry.