Master que Funfou

  /*
    Basic_Master - example using ModbusMaster library
    This file is part of ModbusMaster.

    ModbusMaster is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    ModbusMaster is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with ModbusMaster.  If not, see <http://www.gnu.org/licenses/>.

    Written by Doc Walker (Rx)
    Copyright © 2009-2013 Doc Walker <4-20ma at wvfans dot net>
  */

  #include <ModbusMaster.h>

  // instantiate ModbusMaster object as slave ID 2
  // defaults to serial port 0 since no port was specified
  ModbusMaster node(1,2);

  #define Ena 3
  byte Start = 0;
  byte Regs = 4;
  byte flag = 0;
  //-------------------------------------------------------
  void setup()
  {
    pinMode(Ena, OUTPUT);
    Serial.begin(9600);
    // initialize Modbus communication baud rate
    node.begin(4800);
  }
  //-----------------------------------------------
  void loop()
  {
    static uint32_t i;
    uint8_t j, result;
    uint16_t data[6];
    i++;
    if (flag == 0)
    {
   //   Serial.println("Digite o inicio: ");
      if(Serial.available())                          // Se algo for recebido pela serial do módulo bluetooth
      {
        Start = Serial.parseInt();
        Serial.println(Start);
        flag = 1;
      }
    }
    if (flag == 1)
    {
      Serial.println("Digite qtos Regs: ");
      while(flag == 1)
      {
        if(Serial.available())                          // Se algo for recebido pela serial do módulo bluetooth
        {
          Regs = Serial.parseInt();
          Serial.println(Regs);
          flag = 0;
        }
      }
    }
   digitalWrite(Ena,HIGH);
    // set word 0 of TX buffer to least-significant word of counter (bits 15..0)
    node.setTransmitBuffer(0, lowWord(i));
    // set word 1 of TX buffer to most-significant word of counter (bits 31..16)
    node.setTransmitBuffer(1, highWord(i));
    // slave: write TX buffer to (2) 16-bit registers starting at register 0
    result = node.writeMultipleRegisters(0, 1);
    // slave: read (6) 16-bit registers starting at register 2 to RX buffer
    result = node.readHoldingRegisters(Start, Regs);
//    digitalWrite(Ena,LOW);
       Serial.print("Result ");
       Serial.println(result);
    // do something with data if read is successful
     if (result == node.ku8MBSuccess)
    {
      for (j = 0; j < Regs; j++)
      {
        data[j] = node.getResponseBuffer(j);
          Serial.println(data[j]);
      }
    }
  }