Single wire bus smart keypad controller system

Details Single wire bus smart keypad controller system Single wire bus smart keypad controller system

Filed on

1989-07-31

Date issued

1990-09-25

Examiner

Olms, Douglas W.

Patent Class

Multiplex communications

SubClass

Wide area network

SubSubClass

Packet switching

Other Related Categories

340 7N, 341 26, H04J 302

Type

Patent

Status

active

Patent number

049598317

Description

ABSTRACT:
A smart multiplex keypad scanner system for scanning a matrix of switches utilizes a portion of a clock pulse to read the switch status of one of the switches in a matrix of switches in a system in which a standard counter of a chosen modulo value that counts up to a value one less than the number of switches in the matrix is employed to generate addresses of switches in the matrix.

REFERENCES:
patent: 4318087 (1982-03-01), Wilson
patent: 4502038 (1985-02-01), Lowenthal et al.
patent: 4677308 (1987-06-01), Wroblewski et al.

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