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RS232 serial connection schematic? — Parallax Forums

RS232 serial connection schematic?

JonathanJonathan Posts: 1,023
edited 2004-11-05 22:52 in BASIC Stamp
Hi all,

A few weeks ago I found a schematic for using a MAX232 chip to make a Stamp to PC connection via a Stamp pin and the PC serial port. I built about half of the circuit, and now I can't find the schematic I was using to save my life. Anyone know where I might find such a schematic?

Thanks!

Jonathan

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www.madlabs.info - Home of the Hydrogen Fuel Cell Robot

Comments

  • Jon WilliamsJon Williams Posts: 6,491
    edited 2004-11-05 19:42
    There's a schematic in this N&V Article.

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    Jon Williams
    Applications Engineer, Parallax
    Dallas Office
  • JonathanJonathan Posts: 1,023
    edited 2004-11-05 20:00
    As always, thanks Jon! The schematic I saw before had a couple of resistors on it, pullup and down. I take it they aren't necessary, since they aren't in your article, but could they be a problem? I can remove them if need be.

    Jonathan

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    www.madlabs.info - Home of the Hydrogen Fuel Cell Robot
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2004-11-05 20:44
    Usually the manufacterer data sheet shows a typical applications circuit.· Perhaps you saw it there?· I don't recall resistors before...Just the chip and 4 caps.· That's it.· Either way, the one Jon sent should work for you just fine.



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    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    Designs Page:··· http://www.lightlink.com/dream/designs
    ·
  • Jon WilliamsJon Williams Posts: 6,491
    edited 2004-11-05 22:52
    I've built that circuit as is and it's identical to what we use on the RS-232 AppMod -- no resistors required.

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    Jon Williams
    Applications Engineer, Parallax
    Dallas Office
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