Verfahren und Vorrichtung zur Übertragung von asynchronen Daten über einen synchronen Bus

摘要

The method enables transfer of digital data between a number of terminals (20,20') which are connected via respective couplers (10,10') to a bus (1). The bus includes four redundant data transfer buses which allows transmission errors to be detected and corrected. The transmitted data are divided into temporary frames (25) of fixed period. Each frame is divided into fixed length cells (22) comprising a zone for receiving a message identification code (23). Transmission rights are attributed to the terminals in the cells of the frame. All the couplers are synchronised and a message is composed by a terminal. The message includes the data to be transmitted and an associated message ID code. Each coupler receives the messages contained in the cells which are not attributed to it and analyses each message ID code. If the identification code corresponds to that of a message expected by the terminal, the message is transmitted.