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:
Sep. 16, 1986
Filed:
Nov. 29, 1984
Alan A Figler, Algonquin, IL (US);
John J Selman, Vernon Hills, IL (US);
Baxter Travenol Laboratories, Inc., Deerfield, IL (US);
Abstract
A switch and decoder circuit and method of reading same includes a 4 to 16 line decoder latch for selectively enabling up to 14 manually settable switches, each of which generates a BCD code in response to a switch setting, a plurality of thumb wheel switches each of which is selectively enabled by the decoder latch are connected in parallel to a data bus which can then be sensed by associated circuitry. Two pseudoswitches are provided which may be selectively enabled by the decoder latch and which gate onto the address bus two known, non-BCD codes for hardware checking purposes. A control program in an associated processing unit through input/output circuitry can select a switch whose outputs are to be sensed, read asserted and negated values for the switch, compare the values to a predetermined range of allowable values, and cycle the pseudoswitches to determine whether or not the hardware is functioning properly.