Systems, apparatuses and methods for synchronization pulse control of channel bandwidth on data communication bus
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United States of America Patent
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Aug 30, 2022
Grant Date -
Dec 6, 2018
app pub date -
Nov 28, 2016
filing date -
Nov 30, 2015
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Abstract
An input/output (I/O) and control system for long distance communications and industrial applications having a bus and protocol for communications between field devices and a channel generator for monitoring and control of the field devices. The channel generator produces an offset square wave of configurable frequency on the bus, and sends a synchronization pulse of selected duration at the start of each bus scan cycle in a pulse train cycle to reset counters in the field devices before the bus scan cycle is repeated, to ensure field devices are synchronized, transmitters transmit on the correct channel, and receivers sample the pulse cycle at the correct time. Changing the synchronization pulse length increases bandwidth for shorter, less noisy and more stable systems and inversely decreases bandwidth for increased noise immunity and distance for longer, noisier and less stable systems.
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