Mr Demon,


I definitely solve this.
You will need a couple of transistor per each Tx output and 3 resistor.


As you said, if you disable the usart, also Rx line will be disable.
If you use diodes, you will need a conversor as MAX 232...
Problem with diodos, is due to signal keep positive if Tx is idle. Plus this, Impedance for Tx and Rx line are so sensitive.


If want to communicate several PIC without using interfacing, you can do it using the schematic that I will post next.


/jose p.