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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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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 Circuit Below to view PDF of Schematic

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

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