Dixon,

There are two quotations from your posting here:

1) "It works fine, until I sent a command 01H 03H 00H 04H 0CH"

2) "I have written a loop to send the bytes continuously.
The loop looks something like this.
MOV A, #01H ;Load in byte
WAIT JNB TI, WAIT
CLR TI
MOV SBUF, A"

Please, explain me how do you send the string "01H 03H 00H 04H 0CH" or "01H 03H 0CH 00H" and how do you receive them?

George