Data transmission on equipment including a plurality of data sta

Multiplex communications – Wide area network – Packet switching

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Details

370 89, H04J 300

Patent

active

045702594

ABSTRACT:
Data transmission equipment includes a plurality of data stations connected in series through a loop transmission path. A synchronizing station is connected to the data stations in the loop transmission line. The synchronizing station generates transmission signals made up of a synchronizing slot, an address slot and data transmission slots. A display board for setting and displaying data is connected to at least one of the data stations. Process line controllers are connected to data stations to transmit data related to process control to, or receive data from, a process control apparatus. The data transmission equipment further includes sensor bases connected to data stations. Each data station includes a coupling unit connected in series with the loop transmission line, transmitting and receiving units connected to the coupling unit through a bus, input units provided between the transmitting units and the sensor bases, and a bus provided between the transmitting units and the sensor bases. One embodiment of the equipment includes a buffer memory and an output buffer memory which holds the contents of the buffer memory until they are stored in an output memory.

REFERENCES:
patent: 3764981 (1973-10-01), Takasugi
patent: 3940561 (1976-02-01), Heinze et al.
patent: 4002842 (1977-01-01), Meyr et al.
patent: 4335426 (1982-06-01), Maxwell et al.

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