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:
Apr. 01, 2025
Filed:
Dec. 01, 2023
Applicant:
Endress+hauser Se+co. KG, Maulburg, DE;
Inventor:
Gautham Karnik, Whitestown, IN (US);
Assignee:
Endress+Hauser SE+Co. KG, Maulburg, DE;
Primary Examiner:
Int. Cl.
CPC ...
H03K 5/22 (2006.01); H02J 3/00 (2006.01);
U.S. Cl.
CPC ...
H02J 3/00 (2013.01); H03K 5/22 (2013.01);
Abstract
A process automation system includes a central controller, a four-conductor, multi-drop bus, 1 to 16 1-5 V field devices, and 1 to 16 coupler boxes, each coupler box connecting a respective field device with the bus. The central controller includes a dual-tone, multiple-frequency (DTMF) encoder and each coupler box includes a DTMF decoder. Each coupler box isolates its associated field device's 1-5 V signal from the bus unless the coupler box is addressed by the central controller via a DTMF signal.