Output_high (PIN_C6);
   
  Delay_ms(70);   
     
   //  send 0000001  at 5 baud rate
   Output_low (PIN_C6);
   
   Delay_ms(1800);          //1800 ms
   Output_high (PIN_C6);
   Delay_ms(200);
   

#include <18F452.h>
#fuses XT,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)

#define BAUDRATE 9600
#define TX_PIN  PIN_C6
#define RX_PIN  PIN_C7

#use rs232(baud=BAUDRATE, xmit=TX_PIN, rcv=RX_PIN, ERRORS)

void send_break(int8 time_ms)
{
// Disable the UART and send a Break
// for the specified time.
setup_uart(FALSE);
output_low(TX_PIN);
delay_ms(time_ms);

// Re-enable the UART.
setup_uart(TRUE);
set_uart_speed(BAUDRATE);
}

//======================================
void main(void)
{
int8 i;

while(1)
  {
   // Send 10 bytes of 0x55 to show UART activity
   for(i=0; i<10; i++)
       putc(0x55);
   
   send_break(20);
  }

}