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:
Jun. 07, 1983
Filed:
Oct. 24, 1980
Marion L Moncrief, Jr, Stone Mountain, GA (US);
Frank S Glass, Stone Mountain, GA (US);
Rafael Hernandez, Jimimenez, MX;
Edmund E Chow, Lilburn, GA (US);
Process Technologies, Inc., Tucker, GA (US);
Abstract
An intelligent field interface device for use in a fluid storage facility is disclosed. A bidirectional standard serial communication bus (20) provides communication between a plurality of the interface devices (17) and a central location (18). Surge and lightning protection (50, 51) as well as a high degree of electrical and magnetic isolation (45) are provided between the power supplies of the system. Each device includes a local one chip microcomputer (35) which has a field set address (56) and communicates through optoisolation (27) with the bus through a UART (28). Analog multiplexing (40) of RTD outputs (176-179) or outputs of other transducers (162) is provided to a local to analog to digital converter (36) so that all measured tank parameters may be transmitted digitally back to the control location. An arrangement for both testing and operating a motor operated valve (110) through a two-wire circuit (141, 132) including a limit switch (119) is also shown.