Remote control system for selectively activating and inactivatin

Details Remote control system for selectively activating and inactivatin Remote control system for selectively activating and inactivatin

1985-08-29

1986-12-30

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082552, 34082568, H04Q 700, H04Q 914, G06F 1100

Patent

active

046332472

ABSTRACT:
Sixteen bit messages for selectively controlling receivers either to switch on an apparatus or to switch that apparatus off are transmitted on a format in which sixteen zeros are first transmitted, then a Willard sequence, then a control command, and then sixteen ones. The control command contains, in order of transmission, seven check bits, a control bit, seven address bits and a parity bit. The check bits are obtained by Nordstrom-Robinson coding from the eight data bits which consist of the seven address bits and a control bit, with cyclical rotation of the address bits but non-cyclical treatment of the control bit for deriving the seven check bits, with the result that, because the check bits and the control bit are received first, only three eight bit registers, each used twice first with the check bits as content and then with the address bits and the parity bit as content, are necessary for decoding at the receivers. The check bit comparison detects whether an on command or an off command is still possible and in one of those cases, treats the check bits as reversed in accord with the Nordstrom-Robinson coding, by the sign of the control bit.

REFERENCES:
patent: 4166272 (1979-08-01), Deck
patent: 4368534 (1983-01-01), Sibley
patent: 4554541 (1985-11-01), Bielkevicius et al.

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