\#include <Controllino.h>  /* Usage of CONTROLLINO library allows you to use CONTROLLINO_xx aliases in your sketch. */
\#include <ModbusRtu.h>
\#define ID   2
Modbus slave(ID, 0, 0); // this is slave ID and RS-232 or USB-FTDI
int8_t state = 0;
unsigned long tempus;
// data array for modbus network sharing
uint16_t au16data[9];
void setup() {
  io_setup(); // I/O settings
  // start communication
  slave.begin( 9600 );
}
void loop() {
  // poll messages
  state = slave.poll( au16data, 9 );
  io_poll();
} 
void io_setup() {
  pinMode(CONTROLLINO_D0, OUTPUT);
  pinMode(CONTROLLINO_D1, OUTPUT);  // note that we are using CONTROLLINO aliases for the digital outputs
  pinMode(CONTROLLINO_D2, OUTPUT);
  pinMode(CONTROLLINO_D3, OUTPUT);  // the alias is always like CONTROLLINO_
  pinMode(CONTROLLINO_D4, OUTPUT);  // and the digital output label as you can see at the CONTROLLINO device
  pinMode(CONTROLLINO_D5, OUTPUT);  // next to the digital output screw terminal
  pinMode(CONTROLLINO_A0, INPUT);  // next to the digital output screw terminal
  pinMode(CONTROLLINO_A1, INPUT);  // next to the digital output screw terminal
  pinMode(CONTROLLINO_A2, INPUT);  // next to the digital output screw terminal
  pinMode(CONTROLLINO_A3, INPUT);  // next to the digital output screw terminal
  pinMode(CONTROLLINO_A4, INPUT);  // next to the digital output screw terminal
  pinMode(CONTROLLINO_A5, INPUT);  // next to the digital output screw terminal
}
void io_poll() {
  // set digital outputs -> au16data[1]
  digitalWrite( CONTROLLINO_D0, bitRead( au16data[1], 0 ));
  digitalWrite( CONTROLLINO_D1, bitRead( au16data[1], 1 ));
  digitalWrite( CONTROLLINO_D2, bitRead( au16data[1], 2 ));
  digitalWrite( CONTROLLINO_D3, bitRead( au16data[1], 3 ));
  digitalWrite( CONTROLLINO_D4, bitRead( au16data[1], 4 ));
  digitalWrite( CONTROLLINO_D5, bitRead( au16data[1], 5 ));
  // get digital inputs -> au16data[0]
  bitWrite( au16data[0], 0, analogRead(CONTROLLINO_A0));
  bitWrite( au16data[0], 1, analogRead(CONTROLLINO_A1));
  bitWrite( au16data[0], 2, analogRead(CONTROLLINO_A2));
  bitWrite( au16data[0], 3, analogRead(CONTROLLINO_A3));
  bitWrite( au16data[0], 4, analogRead(CONTROLLINO_A4));
  bitWrite( au16data[0], 5, analogRead(CONTROLLINO_A5));
  // diagnose communication
  //au16data[6] = slave.getInCnt();
  //au16data[7] = slave.getOutCnt();
  //au16data[8] = slave.getErrCnt();
}