Thanks Erik for your answer
First I am not a young man and also not impatient, i'ts normal, whith 8052 i'ts not 485 or 222 or 567 or 789, but rs232.
I have repeat the question because the subject "UART 6 tasck" first question i'ts not correct.
In secodnd time, I post the question because in that site, I did not find any
argument, about my problem.
That is a good site point for all people have problems whith 8052, I use that many time, but I have understand,
whith your help I can go not at RS232 but
at RS999
best regards
Maurizio