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Why I can trigger RS232 by short pin.4 and pin.8?

Discussion in 'Electronic Design' started by Boki, Oct 7, 2004.

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  1. Boki

    Boki Guest

    Dear All,
    The pin.4 and pin.8 are not Tx or Rx of RS232, why I can
    trigger RS232 directly by short them ?

    Best regards,
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