Multi-user serial bus system

专利名称：Multi-user serial bus system发明人：Richard J. Fadem申请号：US07/118814申请日：19871109公开号：US04962378A公开日：19901009

摘要：A new, multi-user data communication system is presented which is inexpensiveand does not require any hardware changes to the central processor/system host. Thestandard serial data input/output port of each terminal is adapted from the standardsingle-user configuration to a party line, multi-user configuration by the addition of asimple and inexpensive interface circuit within each terminal. After the interface circuitsare installed, the terminals can be interconnected to each other and to the centralprocessor/system host using standard serial cabling. The party line interface circuitallows each terminal to access the non- busy serial data bus on a first-come-first-servedbasis. An interference detector and interference handling circuit are provided also toprevent data errors in the event of a possible data collision.

申请人：NCR CORPORATION

代理人：Wilbert Hawk, Jr.,Stephen F. Jewett,Jack R. Penrod

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