RS485 Using Mega2560

Ok ... after some close study of the ModbusMaster.cpp file its clear now. I have understood how the functions node.Read_Temperature(Slave_ID) is implemented. I can now modify it to suit my requirements . For all my Industrial Modbus-RTU applications I can use the ModbusLIbrary. !!

short ModbusMaster::Read_Temperature(uint8_t Slave_ID)
{
  short R1, b1; 
  R1 = readInputRegisters(Slave_ID, 1, 1);{
  b1 =  getResponseBuffer(0);
  delay(2);
  clearResponseBuffer();
  return b1;}
}

Thanks for your support Koepel !!