Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-10-14
1985-10-08
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082552, 34082508, H04Q 900, G06F 1516
Patent
active
045463514
ABSTRACT:
A data transmission system having a common request line and a special request line in addition to a transmission line. The special request line has priority over the common request line. A plurality of node stations are multi-drop connected to the transmission line. Among the node stations, a supervising station is connected to the special request line and takes precedence over other slave stations to become a master station. The master station collects data from the slave stations. The station connected to the common request line can assign a master control function to any station requesting to be assigned the master control function within a short period of time. Each station has an auto response control circuit. The master station automatically collects data by the auto response controlling circuit independently of the microprocessors of the slave stations.
REFERENCES:
patent: 4281380 (1981-07-01), DeMesa, III et al.
patent: 4451881 (1984-05-01), Grice et al.
Standard Specification for S-100 Bus Interface Devices, IEEE Task 696.1/02, 1979, pp. 28-52, Elmquist et al.
German Office Action of Feb. 22, 1984 and Translation Reapplication, P3238532.3-31 (pp. 1-7).
Tokyo Shibaura Denki Kabushiki Kaisha
Yusko Donald J.
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