problem with controller output

I have a problem with controller output. ( From controller's serial port via COM port i send data to my PC, and can recieve it on PC's Hyperterminal ).
While testing the programm into debugger ( Keil C251 uVision2 ), i recieve the string, that i was sent from the programm.
But from real controller i recieve that:

if i use code

for ( i = 0; i < strlen (MyString); i ++)
{
	TI = 0;
	SBUF = MyString[i];
	while(!TI);
}

for ( i = 0; i < 6; i ++)
{
	TI = 0;
	SBUF = MyString[i];
	while(!TI);
}