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robert_

terminating resistor RS-485

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hello, i would to know Why the terminating resistor is used in profibus

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They are used to supress echo signals. When the electrical signal meets the "end" of the line it will try to go back again causing possible duplicate signals, this applies to most bus systems, Profibus, generic RS485, CANopen and so on.

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Check out the answers to the same question on control.com: http://www.control.com/thread/1367509710

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