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RS232 Data Bus Status Indicator


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.

Click on Drawing Below to view PDF version of Schematic

Circuit RS232 Data Bus Status Indicator designed by David Johnson, P.E. (Dec 15, 2004)



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