Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1992-05-01
1995-11-21
Horabik, Michael
Communications: electrical
Continuously variable indicating
With particular transmitter
34087018, 34087039, H04B 354
Patent
active
054691567
ABSTRACT:
A field sensor communication system is arranged in such a manner that, when an electric current, the level of which can be changed to a predetermined level, is, transmitted to a signal transmission line having at least one load resistor connected in series and the voltage change across the load resistor due to the change in the electric current is detected as a reception signal, the predetermined level is cyclically changed to a plurality of levels so that the level at which a good signal reception condition can be realized is determined to perform a communication at the thus determined level. As a result, even if the value of the load resistor in the signal transmission line is changed, the communication can be performed normally, since an undesirable change of the level of the reception signal can be prevented.
REFERENCES:
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patent: 4607247 (1986-08-01), Sterling, Jr. et al.
patent: 4737787 (1988-04-01), Ito et al.
patent: 4806905 (1989-02-01), McGowan, III et al.
patent: 5014050 (1991-05-01), Lewiner et al.
Hitachi , Ltd.
Horabik Michael
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