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Counter Preset and Modified Index Pulse for Use in Incremental Encoder Support Robotic Circuitry

IP.com Disclosure Number: IPCOM000039425D
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Alewine, NJ Klos, MA Mahlbacher, JC McDonald, MG Teeter, JJ Stanley, RC [+details]

Abstract

A technique is described whereby a counter preset and a modified index pulse is used in incremental encoder support circuitry. A course "Home" switch, a modified index pulse, and an eight-bit preset feature is added to the counter circuitry so as to attain the necessary flexibility to adapt a wider range of robotic configurations. Incremental encoders, used to track the position of a motor shaft, require support circuitry to interpret their signals. A counter circuit is usually used to provide the interface between the encoder and the microprocessor controlling the motor. At start-up, the system is set to an initial value so that, as the motor rotates, signals are generated by the encoder and fed to a counter circuit. Two signals are usually used to determine the direction and distance traveled by the motor shaft.