This exchange of data between a central station and the local stations and device for the bidirectional transfer of data for the implementation of the process

摘要

The invention relates to a process for transferring data between a central station sc and the local stations slk, provided in succession on a line in a loop m0 - mp - 1, in which: - the central station emits on the line a first frame under - s0 including an ordered set of data intended for local stations, and; - each local station slk receiving a - frame sk in the extract of the frame, the data which is intended, replaced by another given ε i intended to the central station, and re-emits the new under - frame sk + 1 to the next station slk + 1; - the local station slp - 1 that re-emit thus to the central station, a last under - field sp including an ordered set of data from said local stations. / p & & p & the invention also relates to a device for the exchange of data, for which a pair of the metal-clad ordinary makes it possible to ensure a two-way link in full - duplex between the stations, in particular so as to avoid having to provide a return channel of the local station to the central station. / p & & p & application