MODBUS AND HMI COMMUNICATION HELP

hi,
i trying programind , trying communicate arduino , hmi screen (easy wiev)
when write scada 500 led pin 13 must blinking


#include <modbusmaster.h>
int led = 13;
modbusmaster node(2);


void setup()
{
  node.begin(19200);
}


void loop()
{
  static uint32_t i;
  uint8_t j, result;
  uint16_t data[6];
 
  i++;
 
  // set word 0 of tx buffer least-significant word of counter (bits 15..0)
  node.settransmitbuffer(0, lowword(i));
 
  // set word 1 of tx buffer most-significant word of counter (bits 31..16)
  node.settransmitbuffer(1, highword(i));
 
  // slave: write tx buffer (2) 16-bit registers starting @ register 0
  result = node.writemultipleregisters(0, 2);
 
  // slave: read (6) 16-bit registers starting @ register 2 rx buffer
  result = node.readholdingregisters(2, 6);
 
  // data if read successful
  if (result == node.ku8mbsuccess)
  {
    (j = 0; j < 6; j++)
    {
      data[j] = node.getresponsebuffer(j);
    }
  }
  if(word(2)==200)
 
   {
  digitalwrite(led, high);   // turn led on (high voltage level)
  delay(1000);               // wait second
  digitalwrite(led, low);    // turn led off making voltage low
  delay(1000);               // wait second
 
  }
 
}


is correct 1 if not please tell me  how possible

is modbus library using spi? seem recall does. if case, can't use pin 13 led, 1 of spi pins.

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