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RS-232 Serial Interface Status Indicator Circuit

I designed this circuit many years ago and have used it several times since.  It uses a single logic IC to indicate the TXD and RXD line activity of a typical RS-232 serial data communications link.  The thresholds are set at plus 3 volts and minus 3 volts.  Two dual color LEDs are used as indicator lights. Circuit Data Bus Status Indicator designed by David Johnson, P.E. (Dec 15, 2004)

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