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isolating RS-485 suggestions

Discussion in 'Electronic Basics' started by jibberjabber, Mar 23, 2006.

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  1. jibberjabber

    jibberjabber Guest

    I've found a few basic ways to do this:

    1) Use a standard non-isolated RS-485 transceiver, and isolate the
    data/control lines going to it with 6N137 optoisolators.
    2) Use an isolated transceiver.

    With either of these methods you have to provide isolated power to the
    transciever chip:
    a) use a small isolated DC-DC converter
    b) use a small transformer (P/N ??)

    9600 baud, 300' distance

    Any suggestions or alternate methods? thx
  2. Deefoo

    Deefoo Guest

    Go wireless with those small 400-something MHz modems.


    - Ethernet.
    - Current loop.
    - Power the isolated transmitter by the receiver (i.e. use more wires)

  3. jibberjabber

    jibberjabber Guest

    We're commited to 485 and I need to isolate a leg. Is there a "best" way
    to do it?
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