serial port communication using rs232

[akshay985]

I m using 89c51 for serial port communication.
I m taking binary data from port2 and converting it to ascii and then sending it to serial buffer ,
for binary(00)b ascii code is 0x30 , but the data read at vterminal is unreadable .
plz help me with correct code. i m sending the current code i have developed.View attachment rs232 com.txt

 

[technovm]

#include<REG51.H>
#include<stdio.h>
#include<string.h>

unsigned char data_upper,data_lower,data_convert_lower,data_convert_upper;
void delay_1ms(unsigned int);

void lcdcmd(unsigned char);

void serial_init(); //initialise rs232 communication with com1
void lcddata();
sbit enable = P3^6 ;
sbit rs = P3^7;
unsigned char data_sent;
unsigned char port_data;
// enable equ P2^0;
void main()
{
P0=0xFF;
// P2=0xFF;
P1=0xFF;
/* lcdcmd(0x38);
// delay_1ms(5);
lcdcmd(0x0F);
// delay_1ms(2);
lcdcmd(0x80);
// delay_1ms(2);
lcdcmd(0x06); */
serial_init(); //serial port initialiase

while(1){

// P1=P2;

port_data=P2; //read data from port2 and send to serial port
data_lower = port_data & 0x0F;
data_convert_lower = data_lower | 0x30; //convert to hex code 0x30 to 0x39 for digits
data_sent = data_convert_lower;
P1= data_sent;
/*
data_upper = port_data & 0xF0;
data_upper = data_upper >> 4;
data_convert_upper = data_upper | 0x30;
data_convert_upper = data_convert_upper << 4;
data_sent = data_convert_upper | data_convert_lower;
*/
SBUF=data_sent; // send hex data to serial buffer
// delay();

// lcddata();
// lcddata();
while(TI==0);
TI=0;

}
}

void serial_init()
{
TMOD = 0x20; // 0x20 for serial data transmit mode
TH1=0xFD; // set baud rate to 9600
SCON=0x50;
TR1=1;
TI=0;

}

void lcdcmd(unsigned char cmd)
{
P0=cmd;
rs=0;
enable=1;
delay_1ms(1);
enable=0;
}

void lcddata()
{
unsigned char var1;

P0=data_sent;
rs=1;
enable=1;
delay_1ms(5);
enable=0;

}

void delay_1ms(unsigned int x)
{
unsigned char i;
for(i=0;i<=x;i++)
{
TMOD=0x01;
TL0=0xAA;
TH0=0xFF;
TR0=1;
while(TF0==0);
TF0=0;
TR0=0;
}
}

please verify this modified code.