MSP430F149: MSP430F149 UART communication problem

Hi, i need help, i have a project, its using MSP430F149 to deal with smart home security system. what i need to do now is connect my MSP to my laptop using RS232 to usb through UART and do some simple communication first. But what i face now is i cant really save those character sent from my laptop. My board receiver buffer can only receive one byte once time, so when i try to sent one sentence from my laptop terminal to my board and try to save it in another variable which i declared, the character it saved very messy and i have no idea whats wrong with it. For example, i sent my phone number which like 0124363516 , then i move the number byte by byte from receiver buffer to a variable and then transmit by transmitter buffer to my laptop terminal to show whats inside, its come out like ( 11,22,465) smthin like that. im using IAR embedded workbench IDE and realterm as my terminal. Below are my coding, can i have some help??thanks alot.

include "io430.h"
#include <in430.h> 
#include "nbc430.h"

#define uchar unsigned char
#define uint unsigned int

unsigned char s2;
unsigned char string2[] = { "Plesae Key In Your Message:\r\n" };
unsigned char s;
unsigned char string1[] = { "Please Key In Your Phone Number:\r\n" };

unsigned int i=0;

unsigned char buffer[];

void IO_init(void)
{
P3DIR4=1;P3DIR5=0; 

}
void delay(uint time)
{
uint i,j;
for(i = 0;i < time; i++)
{
for(j = 0;j < 30; j++);
}
}

void init_com( void )
{
P3SEL |= 0x30; 
ME1 |= UTXE0 + URXE0; 


UTCTL0 = SSEL0; 
UBR00 = 0x03; 
UBR10 = 0x00; 
UMCTL0 = 0x34; 

UCTL0 |= CHAR; 
UCTL0 &= ~SWRST; 
IE1 |= URXIE0+UTXIE0; 
IFG1&= ~UTXIFG0;
_EINT(); 
LPM3; 
}

#pragma vector=UART0RX_VECTOR
__interrupt void usart0_rx (void)
{

   while((IFG1&URXIFG0)==0);
   buffer[count]=RXBUF0;
  delay(1);
  TXBUF0 =buffer[count];
  count+=1;

void main(void)
{
WDTCTL = WDTPW + WDTHOLD;
IO_init(); ¯
init_com( ) ; 
while(1);

}