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RS232 CMOS communication

Discussion in 'Electronic Design' started by TeChSaVvY, Feb 19, 2005.

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  1. TeChSaVvY

    TeChSaVvY Guest

    How can i connect UART of CMOS IC to PC(RS232) using voltage converter
    IC? any circuit(max232)? any precaution?
  2. Ken Smith

    Ken Smith Guest

    A few:

    (1) Get the MAX232s in your hands before you assume you can ever get them.
    Maxim has more datasheets for parts you'll never see than any other maker.

    (2) You will be hooking the ground of this systems together. Make sure
    and then check again that there isn't another connection that will make
    large currents flow. Check the ground of the PC and the supply to your

    (3) As you plug the cable on and off, the ground pin won't always hook up
    first. Check you design to make sure that just connecting TXD won't break

    (4) Make sure your PC has an RS-232 port. A lot don't these days. There
    are a few out there with 9 pin D connectors that go to internal cables
    that aren't plugged into anything. (Yes I ran into this)
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