System for interfacing an encoder to a microcomputer

Details System for interfacing an encoder to a microcomputer System for interfacing an encoder to a microcomputer

1982-06-07

1984-07-24

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

340686, 364561, B23K 1124

Patent

active

044619448

ABSTRACT:
Data generated by an encoder with phase quadrature outputs, for instance a displacement transducer in a resistance spot welder control system, is read out of the interface to the computer in a format compatible with computer languages. The quadrature signals are converted to pulses representing positive and negative unit changes of displacement, and fed to an up-down counter which has signed two's complement values at its output. The most recent displacement data is read out while the counter continuously tracks the encoder.

REFERENCES:
patent: 4161781 (1979-07-01), Hildebrant et al.
patent: 4317980 (1982-03-01), Goodrich et al.
patent: 4328463 (1982-05-01), Avins
Pertron Controls Corp., Instruction Manual for the Weldmaster PWC 300, pp. 1-10 only, Jul. 1977.
Hancock, Bi-directional Count from Quadrature Signals, Electronic Engineering, May 1978, p. 24.
Bruce A. Artwick, Microcomputer Interfacing, 1980, pp. 168-169.

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