Deepak Kash wrote:
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I am pretty confident I am there


I think you are not, (neither am I...;-))


but I don't know why my hardware is not able to send data out with this program,the simulation is okay


What do you mean by "the simulation is okay"?

SERIAL: JNB TI,$
CLR TI
cjne r0,#42h,next
mov r0,#40h
sjmp out
next:inc r0
out:mov sbuf,@r0
RETI

what is the purpose of the above statements?
Can you explain what you are trying to do?

What happens if you enter your ISR and the TI-bit is not set?

What happens if R0 does not contain 42H?

What happens if R0 does contain 42H?

As I said: Take a blank sheet of paper and start from scratch, Get your idea's organised, and start with either a high-level pseudo-code or a decent flow-chart.

By the way: all comments from "serpat_explanation.htm" should be in your source-code... not in a separate document.

regards
Patrick