Proteus -- RS-232 dual computer communication

1. Circuit diagram

MAX232 by +5V Single power supply RS-232 Level conversion chip , Internal integrated charge pump circuit 、 Can produce +12V and -12V Two power supplies , Provide RS-232 The need of serial port level , The pin diagram is shown in the figure 5~20 Shown . among , Pin 1、2、3、4、5、6 External capacitance , Composition charge pump .T1in、T2in by TTL Level input , convert to RS-232 After level , Respectively from the T1our、T2our Output ;R1in、R2in by RS-232 Level input , convert to TTL After level , Respectively from the R1our、R2our Output .

2. Code

#include<reg51.h>// Include access sfr Library function rug51、h
unsigned char code c[10]=(// Define the sending data array , And the assignment 
0xc0,0xf9,0xa4,0xb0,0x99,0x92,0xf8,0xf8,0x80,0x90);//0～9 Gongyang share code 
void main(){
    
unsigned char i;
unsigned long t;
TMOD=0x20;
TH1=0xe8;TL1=0xe8;
SCON=0x40;
PCON=0;
ET1=0;
ES=0;
TR1=1;
while(1){
    
	for(i=0;i<16;i++){
    
	SBUF=c[i];
	while(TI==0);
	TI=0;
	P1=c[i];
	for(t=0;t<21740;t++);}}}
(2) Machine B receives 
#include<reg51.h>// Include access sfr Library function rug51、h
void main(){
    
unsigned char i;
TMOD=0x20;
TH1=0xe8;TL1=0xe8;
SCON=0x40;
PCON=0;
ET1=0;
ES=0;
TR1=1;
while(1){
    
	for(i=0;i<16;i++){
    
	REN=1;
	while(RI==0);
	REN=0;
	RI=0
	P1=SBUF;}}}