Keypad status reporting system

Details Keypad status reporting system Keypad status reporting system

1990-09-27

1993-06-15

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379359, 341 22, 341 24, 341 26, G06F 302

Patent

active

052206017

ABSTRACT:
A keypad status reporting system provides an indication over a serial bus as to which switch of a plurality of keypad switches is being selected by an operator wherein each keypad switch is coupled between a respective different pair of row and column conductors. The system generates parallel three-bit row and column addresses, combines the row and column addresses to form a parallel six-bit key code, and converts the key code to serial bits of data and places the serial bits of data onto a multiplexed bus in a predetermined channel.

REFERENCES:
patent: 3928847 (1975-12-01), Spence
patent: 4086588 (1978-04-01), Kawanabe et al.
patent: 4318087 (1982-03-01), Wilson
patent: 4346369 (1982-08-01), Macy
patent: 4390754 (1983-06-01), Holberg
patent: 4414538 (1983-11-01), Schnizlein
patent: 4554530 (1985-11-01), Mussmann
patent: 4821033 (1989-04-01), Mori et al.
patent: 5025255 (1991-06-01), Mould

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