Hi all,
I am new to assembly programming, esp 8051. Im currently working on a system that requires me to (not necessarily at the same time) handle 3-4 RS-485 serial ports. My problem is that I understand only one SCON is provided for serial ports and no matter which port receives the data, the same RI is generated, now how do i know which port got the data??(the data might also be a 00h).

Thanks for any help ...

Warm regards,
Sriharsha.