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:
Feb. 22, 1994
Filed:
Dec. 23, 1991
David W Caldwell, Holland, MI (US);
Nicholas W Medendorp, Holland, MI (US);
Donnelly Corporation, Holland, MI (US);
Abstract
A module electrical control system for controlling office equipment includes a plurality of control modules interconnected with an input module via a system bus assembly. The input module includes an input-generating device, such as a keypad or the like, for generating an input signal, an output port to which the system bus assembly is connected and a circuit that is responsive to the input signal for supplying a command signal to the output port. The circuit includes a switch control unit that is responsive to a particular state of the input signal by producing a switched low voltage output signal and an address and command control until that is responsive to a particular state of the input signal by producing a particular value of a data signal. The system bus assembly includes at least two signal channels; one selectively supplied with the switched low voltage signal and the other selectively supplied with the data signal. Each control module is one of at least two types. A first type includes a control circuit that is responsive to the switched low voltage signal on the first signal channel in order to perform a control function on the load connected therewith. All control modules of the first type will respond concurrently to the switched low voltage signal. A second type of control module includes a control circuit that is responsive to a particular value of the data signal on a second signal channel uniquely assigned to that control module in order to perform a control function on the load connected therewith. Thus, modules of the second type will respond individually to the data signal.