Method of exchanging data

Details Method of exchanging data Method of exchanging data

H - Electricity

04

L

340/80

H04L 5/14 (2006.01) H04L 12/403 (2006.01)

Patent

CA 2012209

- 16 - 89/038 ABSTRACT OF THE DISCLOSURE 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 (N) sends a telegram with a time limit (TOL) 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 (TOL); 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 (TOL) 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 (TOL) specified by it, the master station (M) again accepts sole possession of the control token. (Fig. 2b)

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