Title:
【発明の名称】回路網を介して通信する通信方法及びそのステーション
Document Type and Number:
Japanese Patent JP3138484
Kind Code:
B2
Abstract:
A communications network is comprised of master and slave stations. The master stations (302, 306) may receive a master token allowing control of the network (307, 311, 312) for sending messages, and a solicit token that allowing the master stations to solicit other master stations for entry into the network (307, 311, 312). A master station (302, 306) receiving a solicit message answers with an acknowledgement signal and may immediately begin soliciting for successors. The slave stations (304, 308) receiving a solicit message may not accept the master token or the solicit token but must respond with a negative acknowledgement. Slave stations (404, 308) enter the network to respond to messages only. The use of slave stations (304, 308) allows for the implementation of simpler networks and improves network efficiency. The negative acknowledgement identifies the presence of the slave stations (304, 308) and allows detection of duplicate network nodes.
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Inventors:
Stuart Bie Siegel
Jeffrey Carl Marriott
Jeffrey Carl Marriott
Application Number:
JP40696190A
Publication Date:
February 26, 2001
Filing Date:
December 26, 1990
Export Citation:
Assignee:
Allen-Bradley Company, Inc.
International Classes:
H04L12/417; (IPC1-7): H04L12/437
Domestic Patent References:
| JP6346839A |
Other References:
【文献】米国特許4667323(US,A)
Attorney, Agent or Firm:
Akira Asamura (2 outside)