Re: Serial port isolation

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  1. - 11th September 2007, 12:21 #7
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    dhouston
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    IIRC, the circuit in the app note has a 470 ohm resistor in the PIC TX circuit to limit the current through the opto and a 10K resistor in the PIC RX circuit to limit the current to the PIC pin. The circuit gives you isolation, level translation and inverts the signals but it may not work for you since it draws its power from the RTS & DTR lines.
    Last edited by dhouston; - 11th September 2007 at 12:27.
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