LogNet: a low cost, high reliability network for embedded systems
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United States of America Patent
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N/A
Issued Date -
Jan 31, 2002
app pub date -
Mar 21, 2001
filing date -
Nov 30, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A low cost network efficiently supporting both event-driven and constant data rate messages is implemented using inexpensive off-the-shelf micro controllers and firmware. The network firmware uses less than 2K bytes for the network hub and less than 1K bytes for the other network nodes A combination of polling and token passing ensures each node can become 'Master' and control the network and thus providing for steady data rate transfers. A specially designated 'Hub-node' ensures fairness by preventing idling nodes from unnecessarily taking control of the network access. The Hub controls the token advance signal going to all nodes. The client/server protocol with peer/peer capabilities utilizes both master/slave and token passing media access methods.
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