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I tried just looping data back to the adapter using a standard COM Port null modem, why didn it work?

April 26, 2017adapter Data looping modem null port standard

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I tried just looping data back to the adapter using a standard COM Port null modem, why didn it work?

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A. Null modems are intended for asynchronous adapters or standard COM ports. They are not meant for synchronous communication as with synchronous communication, the pinouts and signals are different from asynchronous.