Importance

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Abstract

A method of exchanging data in a network having a master station (M), at least one subscriber station and a common data channel according to a hierarchical token-passing principle comprises the following steps: a) at the start of the data exchange the master station (M) has sole possession of the control token; b) in order to initiate a data exchange the master station (M) sends a telegram with a time limit (T0L) specified by it to at least one receiver (E1); c) at least one receiver (E1) accepts the control token for a period limited by the specified time limit (T0L); d) at least one and every subordinate further receiver (E1, E2, E3) either passes the control token with a telegram and a further time limit (T1L, T2L) not exceeding the specified time limit (T0L) on to a subordinate further receiver (E2, E3), or allows the specified time limit to expire without relinquishing the control token; e) after expiry of the time limit (T0L) specified by it, the master station (M) again accepts sole possession of the control token.

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First Claim