Multiplex communications – Wide area network – Packet switching
Patent
1986-03-26
1988-02-23
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 90, 370 96, 3408255, H04J 302
Patent
active
047275391
ABSTRACT:
A plurality of slave stations receive a plurality of apparatus information signals concerning apparatus to be controlled (or sensors), and a master station allots the apparatus information signals to time slots in a transmission path and receives a specified apparatus information signal with priority from the respective slave stations. A priority change information signal adder in the master station adds a priority change information signal for changing priority of the information signals transmitted from each slave station to an information transmission signal string containing a sync signal and various information signals transmitted to each slave station. A multi-element information signal separator/processor in the master station separates and processes the multi-element information signals transmitted from each slave station, on the basis of the priority change information signal. A detector/counter in each slave station detects the sync signal transmitted from the master station and counts the number of time slots following the sync signal. A transmission pattern reconstructor in the slave station reconstructs transmission patterns of the respective slave stations in accordance with the priority change information signal when a count value coincides with a predetermined value.
REFERENCES:
patent: 3633169 (1972-01-01), Bickford
patent: 4340961 (1982-07-01), Capel et al.
patent: 4608685 (1986-08-01), Jain et al.
patent: 4653049 (1987-03-01), Shinmyo
patent: 4663756 (1987-05-01), Retterath
Arita Setsuo
Fukunishi Kohyu
Ichinose Yuji
Kitaura Wataru
Hitachi , Ltd.
Olms Douglas W.
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