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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

    adamp524

    4
    0
    Apr 28, 2010
    Hi,

    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:
    http://www.farnell.com/datasheets/71023.pdf

    Anyone have any ideas?

    Thanks
     
  2. Laplace

    Laplace

    1,252
    184
    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
    http://www.bb-elec.com/tech_articles/rs422_485_app_note/table_of_contents.asp
     
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