Hi Mr. Aman,

The system is exactly as you have understood.

The multi-processor communication scheme describes this method, which i have used.

1) TX of one MCU can drive more than one RX loads
2) TX of slaves is connected together, and you are wondering why the slaves don't get damaged? The reason (i am not sure, but an idea only) is that when you use serial port, you don't declare TX as output. Do you?????
So the hardware, declares it o/p when it has to transmit some characters, and since at one time, only one slave transmits so the TX of other 3 slaves is not O/P pin at that time.


I may be wrong at the answers, but this communication scheme does work.

I will look for exact details, and will let
you know.


Regards

IA