Process for data transfer with increased security against constr

Details Process for data transfer with increased security against constr Process for data transfer with increased security against constr

1976-10-12

1979-08-28

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

G06F 1100, G08C 2500

Patent

active

041662725

ABSTRACT:
A process for exerting control over a remote facility by transmission of control data protected against error due to component breakdown and/or failure as a result of said process, which comprises; creating a message having a plurality of bits in which the states of at least selected ones of the bits determine the presence (or absence) of a particular command; transmitting the message in serial fashion; inverting the message bits after each message transmission so that the bits of the message are transmitted in true and inverted form in an alternating fashion. The message bits are preferably employed to modulate a carrier. A receiver demodulates the carrier and places the message bits representing a particular command across a transformer input winding. The transformer preferably has a saturable magnetic core having a right-angle hysteresis curve characteristic.
The state of one bit of the message is preferably established by a constant reference source which, however, is also subject to inversion along with all other bits of the message. Additional security coding may be employed to provide increased protection against error.

REFERENCES:
patent: 3344353 (1967-09-01), Wilcox
patent: 3427585 (1969-02-01), Milford
patent: 3737577 (1973-06-01), Birkin
patent: 3772649 (1973-11-01), Haselwood et al.
patent: 3781792 (1973-12-01), Birkin
patent: 3876980 (1975-04-01), Haemmig et al.
patent: 3986167 (1976-10-01), Paul

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