Thanks by your answer:
Dwayne
Mister_e
Let me explain my problem:
I have a terminal equipment (8052 based) it send and receive data at 19200bps I use serout/in comand to conect this terminal,
at the other end I have a radio-modem conected to the usart at 9600bps of port of a pic16f877 the terminal has a ascii keyboard and the idea is get data from the terminal and respond to her for displaying that key , but at same time (well no really) I have to check the radio-modem if there is data available, I no want loss a packet data of this modem there is no way to recovery the data since that only is send from a central to radio-modem ONCE, that is the problem thanks again...