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Pc serial connection ?

Discussion in 'Electronic Basics' started by coulyo, Sep 12, 2003.

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  1. coulyo

    coulyo Guest

    Hello all,
    I want to build a PIC project which can be found here
    My question : is it necessary to connect pins 7 & 8
    and pins 1, 4, and 6 as shown in the picture in Alphabet.asm,
    since all we are using are send and receive (pins 2 & 3) ?
  2. No. Feel free to leave them completely disconnected. Pins 1, 4, and 6 are
    the Carrier Detect, Data Terminal Ready, and Data Set Ready data lines,
    respectively. Unless you are using some funny software on the host computer
    which expects a modem to be attached, everything will work fine.

    Howard Henry Schlunder
  3. Si Ballenger

    Si Ballenger Guest

    If you are using win95/98 and plan to echo characters to the com
    port, you will need the extra wiring. You can echo in XP with out
    problems. Other methods of sending to the comport may not need
    the extra wiring.
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