Method and apparatus for exchanging messages in a ring network.

摘要

1. Method for exchanging messages within a circular network between a transmitting station and several stations of the network to which a message contained within a frame is liable to be adressed, the method comprising : the transmission by the transmitting station (EM) of a blank field (CV) not containing any information at the beginning and the modifications of at least one bit (C) denoting that all the stations addressed have duply copied the message or that at least one addressed station has not copied the message, characterized in that it also comprises the following stages : modification of the information contained in this blank field (CV) upon passing through each station by incrementation within each station of a counter field (CPT) the capacity of which is in relationship with the number of stations of the network. - modification or copying of a least one bit (A) denoting that at least one station has identified itself as having been addressed, or that one of the stations has identified itself as having been addressed, - transmission of a field (FT) denoting the end of the frame preceding the blank field (CV), - and modification or copying of a bit (E) of the field (FT) denoting the end of the frame in relationship with the validity of the frame.