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Title: Remote two-wire data entry method and device

Abstract

This invention is comprised of a device for detecting switch closure such as in a keypad for entering data comprising a matrix of conductor pairs and switches, each pair of conductors shorted by the pressing of a particular switch, and current-regulating devices on each conductor for limiting current in one direction and passing it without limit in the other direction. The device is driven by alternating current. The ends of the conductors in a conductor pair limit current of opposing polarities with respect to each other so that the signal on a shorted pair is an alternating current signal with a unique combination of a positive and a negative peak, which, when analyzed, allows the determination of which key was pressed. The binary identification of the pressed key is passed to the input port of a host device.

Inventors:
Issue Date:
Research Org.:
Westinghouse Savannah River Co., Aiken, SC (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10166589
Patent Number(s):
-US-A7720128
Application Number:
ON: DE93015716; PAN: 7-720,128
Assignee:
Dept. of Energy SRS; SCA: 426000; 990200; PA: EDB-93:115151; NTS-93:023359; ERA-18:030029; SN: 93001000202
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 1991
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; SWITCHING CIRCUITS; DESIGN; COMPUTERS; RECORDING SYSTEMS; DATA ACQUISITION SYSTEMS; INVENTIONS; SWITCHES; 426000; 990200; COMPONENTS, ELECTRON DEVICES AND CIRCUITS; MATHEMATICS AND COMPUTERS

Citation Formats

Kronberg, J.W. Remote two-wire data entry method and device. United States: N. p., 1991. Web.
Kronberg, J.W. Remote two-wire data entry method and device. United States.
Kronberg, J.W. Tue . "Remote two-wire data entry method and device". United States. https://www.osti.gov/servlets/purl/10166589.
@article{osti_10166589,
title = {Remote two-wire data entry method and device},
author = {Kronberg, J.W.},
abstractNote = {This invention is comprised of a device for detecting switch closure such as in a keypad for entering data comprising a matrix of conductor pairs and switches, each pair of conductors shorted by the pressing of a particular switch, and current-regulating devices on each conductor for limiting current in one direction and passing it without limit in the other direction. The device is driven by alternating current. The ends of the conductors in a conductor pair limit current of opposing polarities with respect to each other so that the signal on a shorted pair is an alternating current signal with a unique combination of a positive and a negative peak, which, when analyzed, allows the determination of which key was pressed. The binary identification of the pressed key is passed to the input port of a host device.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}