[PIC] sending data to pic via max 232 by rs232 not working in proteus

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#include<18f2550.h>
#fuses NOWDT,HS,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,INVERT,parity=N,bits=8)
 
void main()
{
 
  char a;
  printf("Start typing ...\n.");
  
  while(1)
  {
    a=getc();
    putc(a);
  }
  
}

Code C - [expand]
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#if defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
 
#elif defined(__PCH__)
#include <18F2550.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7,ERRORS,INVERT)
 
#elif defined(__PCD__)
#include <30F2010.h>
#fuses HS, NOWDT, NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, UART1A)
#endif
 
 
#define BUFFER_SIZE 32
BYTE buffer[BUFFER_SIZE];
BYTE next_in = 0;
BYTE next_out = 0;
 
 
#int_rda
void serial_isr() {
   int t;
 
   buffer[next_in]=getc();
   t=next_in;
   next_in=(next_in+1) % BUFFER_SIZE;
   if(next_in==next_out)
     next_in=t;           // Buffer full !!
}
 
#define bkbhit (next_in!=next_out)
 
BYTE bgetc() {
   BYTE c;
 
   while(!bkbhit) ;
   c=buffer[next_out];
   next_out=(next_out+1) % BUFFER_SIZE;
   return(c);
}
 
void main() {
 
   enable_interrupts(int_rda);
   #if defined(__PCD__)
   enable_interrupts(intr_global);
   #else
   enable_interrupts(global);
   #endif
 
   printf("\r\n\Running...\r\n");
 
               // The program will delay for 10 seconds and then display
               // any data that came in during the 10 second delay
 
   do {
      delay_ms(10000);
      printf("\r\nBuffered data => ");
      while(bkbhit)
        putc( bgetc() );
   } while (TRUE);
}

Code C - [expand]
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printf("\r\n\Running...\r\n");