Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-08-02
1984-07-10
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
3408255, 370 94, 375 8, H04Q 900
Patent
active
044595891
ABSTRACT:
A data communication system between a plurality of data terminals comprises of a terminal apparatus to which a plurality of data terminals are coupled in a star structure through pair lines. The terminal apparatus has a plurality of cable driver circuits and a plurality of cable receiver circuits each coupled with a related data terminal through said pair lines, and outputs of cable receivers and inputs of cable drivers are coupled commonly to a single common line. Thus, data from a data terminal is transmitted to another data terminal through a terminal apparatus. A communication control apparatus is installed close to a data terminal. The communication control apparatus has a data terminal transmit data only when other terminals do not transmit data in order to prevent collision of data in the terminal apparatus. The use of pair lines between data terminals and the common terminal apparatus, the simple structure of the terminal apparatus which has only cable drivers and cable receivers coupled together, and a collision control performed in a communication control apparatus which is positioned close to a data terminal are features of the present invention.
REFERENCES:
patent: 3783194 (1974-01-01), Vilips et al.
patent: 3818447 (1974-06-01), Craft
patent: 4063220 (1977-12-01), Metcalfe et al.
patent: 4259663 (1981-03-01), Gable
patent: 4292623 (1981-09-01), Eswaran et al.
patent: 4321703 (1982-03-01), Schwartzel et al.
patent: 4412326 (1983-10-01), Limb
Novack Martin
OKI Electric Industry Co., Ltd.
Yusko Donald J.
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