Communications: electrical – Continuously variable indicating – With meter reading
Patent
1988-08-22
1990-06-12
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
3408252, 371 55, 375116, H04B 1700, H04Q 136
Patent
active
049336720
ABSTRACT:
The data transmission system includes a data transmitter for transmitting either data bits or a sequence of N alarm bits in a first binary state. The transmitter includes a decode circuit (16) providing a detection signal each time that, in a data bit stream, a sequence of n bits in the first binary state has been loaded in a shift register (14), a XOR circuit (18) modifying the binary state of the bit following the sequence of n bits in response to the detection signal provided by the decode circuit (16), thereby providing a modified data bit stream on the transmit line (20), the number n being chosen so that no modified data bit stream can be formed of N bits in the first binary state which could be confused with the sequence of N alarm bits. On the reception side, the data receiver performs the reciprocal operation of the data transmitter.
REFERENCES:
patent: 4161719 (1979-07-01), Parikh et al.
patent: 4531212 (1985-07-01), Hadziomerovi
patent: 4689790 (1987-08-01), Lacroix et al.
patent: 4745601 (1988-05-01), Diaz et al.
Patent Abstracts of Japan, vol. 1, Jul. 22, 1977, No. 145, p. 1216.
Blanc Alain R.
Jeanniot Patrick J.
Leotard Robert L.
Duffield Edward H.
International Business Machines - Corporation
Magistre Dervis
Yusko Donald J.
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