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:
Mar. 06, 1984
Filed:
Nov. 02, 1981
Applicant:
Inventor:
John E Callan, Milwaukee, WI (US);
Assignee:
Allen-Bradley Company, Milwaukee, WI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04Q / ;
U.S. Cl.
CPC ...
34082508 ; 3403 / ; 34082565 ;
Abstract
A plurality of remote stations are sequentially addressed by a master controller to ascertain the status of associated sensing devices. The addresses are each comprised of a sequence of sinusoidal waveforms which are counted by the remote stations and compared with a preselected station number. Each addressed station responds by driving a communication line to a low voltage level for a time interval determined by the status of its associated sensing device.