i dont know how to attatch the schematics here but the compiler is the 8051 ide and here is an example of the assembly code
( i got that code from 8052 website here and i simulated it on the 8051 ide also ) i think there is no problem with it
;***************************************************************
;This is an example of polled transmit
;**************************************************************
;
CR EQU 0DH
LF EQU 0AH
;
ORG 0
LJMP MAIN
;
ORG 40H
MAIN: LCALL SERINIT
MOV DPTR,#HELLO
LCALL TEXT_OUT
MOV DPTR,#MSG1
LCALL TEXT_OUT
MOV DPTR,#MSG2
LCALL TEXT_OUT
LOOP: AJMP LOOP ;STOP HERE
;*****************************************************************
;Other Serial Messages
;
HELLO: DB 'Hello World',CR,LF,0
MSG1: DB 'I am sending messages to my terminal!',CR,LF,0
MSG2: DB 'This is fun..',CR,LF,0
;**************************************************************
SERINIT: ;Initialize serial port
CLR TR1
CLR TI
CLR RI
MOV SCON,#01011010B ;TI SET INDICATES TRANSMITTER READY.
;MODE 1 REN
MOV TMOD,#00100001B ;TIMER 1 MODE 8 BIT AUTO RELOAD
MOV TH1,#0FDH ;TIMER RELOAD VALUE
SETB TR1 ;START TIMER
MOV DPTR,#SINIT
LCALL TEXT_OUT
RET
;
SINIT: DB CR,LF
DB 'Serial Port Initialized! '
CRLF: DB CR,LF,0
;**************************************************************
TEXT_OUT:
WT1: CLR A
MOVC A,@A+DPTR
INC DPTR
JZ WT2
LCALL CHAR_OUT
AJMP WT1
WT2: RET
;**************************************************************
CHAR_OUT:
CLR TI
MOV SBUF,A
JNB TI,$
CORET: RET
;**************************************************************


i am most suspicious about the HW circuit of the (Max 232 cpe )because it becomes very hot when connecting the power to it..