I got 2 units of 80c31 microcontroller,
each connected to a BIM2 tranciever.(www.radiometrix.co.uk)

THE 2 MICROCONTROLLERS SUPPOSE TO COMMUNICATE !?

I need to sent 8 bit data through the RXD & TXD, using the 8031 serial interrupt.

The two main problems are :
1. The data recieved on RXD is not the same data that been read by the accumulator ! HOW CAN IT B ???
can it be related to reading timings ?
2. When running the prog, RI cause interrupt to jump, even no data has been sent from the second unit.

I want to mark that all necessary actions had been done in order to set
TCON,SCON,TMOD,IE,IP, for right operation of the micricontrollers.

any suggestions will be highly appreciate.

Tanks a lot !