;(do all the init stuff). No 

HANDS:
MOV A,#'R'
JNB RI,$
CJNE A,SBUF,HANDS
CLR RI

MOV A,#'U'
JNB RI,$
CJNE A,SBUF,HANDS
CLR RI

MOV A,#'N'
JNB RI,$
CJNE A,SBUF,HANDS
CLR RI

MOV SBUF,#'O' 
; I'm not sure if SETB TI is needed or not, not quite in mood to check right now.
JNB TI,$

MOV SBUF,#'K' 
; I'm not sure if SETB TI is needed or not, not quite in mood to check right now.
JNB TI,$

SETB IE
;(proceed with main loop and real "data" communication in interrupts.)