Re: Serial port isolation

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  1. - 12th September 2007, 01:09 #1
    Steve_88's Avatar
    Steve_88
    Steve_88 is offline Junior Member
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    Hi Dave,

    I'm only needing to interface the TX line to my PIC. I don't believe that the TX portion of the circuit has any connections other than TX and ground?

    Thanks,
    Steve
  2. - 12th September 2007, 02:32 #2
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    Squibcakes
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    See the attached image. Its a cut and paste from one of my circuits....

    In a nutshell, RXC is your TX line from the GPS, RXD is the ground from your GPS. These connections can be either 232 or 422.
    The diode can be any fast switching type.

    TX2 goes to your PIC, serial pin, but best if you use a USART pin for flexibility.

    Good luck

    Cheers
    jared
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  3. - 12th September 2007, 05:29 #3
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    dhouston
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    Quote Originally Posted by Steve_88 View Post
    I'm only needing to interface the TX line to my PIC. I don't believe that the TX portion of the circuit has any connections other than TX and ground?
    Yes, just use the section that connects to TX & GND and on the other side of the opto to RB1 and the PIC ground. Include all three resistors
    www.davehouston.net
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