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RS422 and RS485 using the same drivers

Discussion in 'General Electronics Discussion' started by adamp524, Apr 30, 2010.

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  1. adamp524


    Apr 28, 2010

    I'd like to know if its possible to use an RS422 driver chip equipped with receiver and driver enables / disables as an RS485 chip?

    The reason being is that I would like to be able to switch between the two communications standards while not changing the physical communications link attached to the circuit.

    The RS422 driver chip I had in mind was this:

    Anyone have any ideas?

  2. Laplace


    Apr 4, 2010
    As your referenced datasheet shows, an RS422 chip when equipped with tri-state outputs is essentially an RS485. An RS485 chip will work with an RS422 interface, but an RS422 will not work with a full RS485 interface where tri-state outputs are necessary because multiple transmitters are sharing the same wire line. A good RS422/485 reference would be
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