Dear Piccers,

I remember, that a long time ago I saw an application note for a
RS232-to-PIC(5V) interface which worked without any external power supply,
but it took the needed voltages from some pins of the serial port. It had
just a RS232 9 pole Dsub and 3 Pins (Rx,Tx,GND) on the PIC side.

I just googled but wasn't successful.

Does anybody remember such an application?

Thanks for any help and best regards

Peter


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