Circuit - RS232 Data Bus Status Indicator

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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