[SOLVED] how programing distance with RS485 using mikroc

Code C - [expand]
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char dat[10];                          // buffer for receving/sending messages
char i,j;sbit  rs485_rxtx_pin  at RC2_bit;               // set transcieve pin
sbit  rs485_rxtx_pin_direction at TRISC2_bit;   // set transcieve pin direction
// Interrupt routinevoid interrupt() {  RS485Master_Receive(dat);}void main(){
  long cnt = 0;
  ANSEL  = 0;                          // Configure AN pins as digital I/O
  ANSELH = 0;  C1ON_bit = 0;                        // Disable comparators
  C2ON_bit = 0;    PORTB  = 0;  PORTD  = 0;  TRISB  = 0;  TRISD  = 0;
  UART1_Init(9600);                    // initialize UART1 module
  Delay_ms(100);
  RS485Master_Init();                  // initialize MCU as Master
  dat[0] = 0xAA;  dat[1] = 0xF0;  dat[2] = 0x0F;
  dat[4] = 0;                          // ensure that message received flag is 0
  dat[5] = 0;                          // ensure that error flag is 0
  dat[6] = 0;  RS485Master_Send(dat,1,160);
  RCIE_bit = 1;                        // enable interrupt on UART1 receive
  TXIE_bit = 0;                        // disable interrupt on UART1 transmit
  PEIE_bit = 1;                        // enable peripheral interrupts
  GIE_bit = 1;                         // enable all interrupts  while (1){
                                       // upon completed valid message receiving
                                       //   data[4] is set to 255    cnt++;
    if (dat[5])  {                     // if an error detected, signal it
      PORTD = 0xAA;                    //   by setting portd to 0xAA    }
    if (dat[4]) {                      // if message received successfully
      cnt = 0;
      dat[4] = 0;                      // clear message received flag
      j = dat[3];      for (i = 1; i <= dat[3]; i++) {  // show data on PORTB
        PORTB = dat[i-1];
      }                                // increment received dat[0]
      dat[0] = dat[0]+1;               // send back to master      Delay_ms(1);
      RS485Master_Send(dat,1,160);    }   if (cnt > 100000) {      PORTD ++;
      cnt = 0;      RS485Master_Send(dat,1,160);
      if (PORTD > 10)                  // if sending failed 10 times
        RS485Master_Send(dat,1,50);    //   send message on broadcast address
     }  }}