Aubrey,

Thank you for your reply.

Yes I have set the MSComm as matter of fact I can receive characters from the 8051. The issue is when I try to send a charater to the micro.

I put a routine like this:

RECEIVE:
;
WAIT3:
JNB RI, WAIT3 ;Wait for reception to be completed.

MOV A, SBUF ; put the character in A
CLR RI ; clear the receive flag

MOV R5, A ; save the char read


And the visual basic:

MSComm.Output = "A" + CHR$(13)


Any idea?

Thanks,
Alex