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:
Aug. 27, 1991
Filed:
Dec. 22, 1989
Abdul Rashid, Rockford, IL (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
A 'reversible master/slave' handshaking protocol is disclosed for addressing the problem of interfacing a multiplexing analog-to-digital (A/D) converter, having a first operating rate, to a microprocessor, having a second operating rate. In the specific embodiment of a generator control unit (GCU) for an electrical power generating system, an analog multiplexer (124), an A/D converter (126), and a dual-port RAM (130) are controlled by an A/D controller (134) to provide data words to a voltage regulator processor (92). If a fast A/D converter is used, then the A/D controlling system will multiplex and convert samples from all of the analog input signals, load the RAM, and wait for the processor to read the RAM. If the A/D conversion rate is slow, the A/D controller will continuously sample all the multiplexed channels, while the processor waits for the appropriate channel information to be loaded into the RAM. In this manner, data acquisition can be perform utilizing A/D converters having various conversion rates, multiplexers having additional channels, or microprocessors having numerous feedback control loops.