This example use Simple-Modbus library developed by Comfile Technology.

simplemodbusrtu_mega2560.zip

The example below was created using FA-DUINO-32TA.

This project illustrates how to use a ComfileHMI to monitor and control an FADUINO's digital inputs and outputs.

Download ComfileHMI Project
Download FADUINO Source Code

#include "SimpleModbusRtu_mega2560.h"
 
uint16_t au16data[16];
uint8_t au8data[10];
 
void setup()
{
  int i;
  for(i=22; i<38; i++){ pinMode(i, INPUT); } // 22 ~ 37 Inputs
  for(i=38; i<52; i++){ pinMode(i, OUTPUT); }   // 38 ~ 51 Outputs
 
  Serial.begin(9600);
 
  usart1init(57600); // 9600, 19200, 38400, 57600 , Serial channel1
  startSimpleModbus(1, au16data, au8data); // slave address, register, coil
}
 
void loop() 
{  
  int n;
  for(n=0; n<8; n++){ bitWrite(au8data[0] ,n, digitalRead(n+22)) ;}  //Input 
  for(n=0; n<8; n++){ bitWrite(au8data[1], n, digitalRead(n+30)) ;}
 
  for(n=0; n<8; n++){ digitalWrite(38+n, bitRead(au8data[2], n)) ;}  // Output
  for(n=0; n<8; n++){ digitalWrite(46+n, bitRead(au8data[3], n)) ;}
}

This project illustrates how to use a ComfileHMI to monitor and control an FADUINO's analog inputs and outputs.

Download ComfileHMI Project
Download FADUINO Source Code

#include <SimpleModbusRtu_mega2560.h>
 
uint16_t au16data[16];
uint8_t au8data[10];
int pwm6 = 6;
int pwm7 = 7;
int incomingByte = 0; 
 
void setup() {
  char i;
  pinMode(pwm6, OUTPUT); 
  pinMode(pwm7, OUTPUT); 
 
  Serial3.begin(57600);
  usart1init(57600); // 9600, 19200, 38400, 57600 , Serial channel1
  startSimpleModbus(1,au16data, au8data); // slave address, register, coil  
}
 
void loop() 
{
  au16data[0] = analogRead(A0);
  au16data[1] = analogRead(A1);  
  au16data[2] = analogRead(A2);
  au16data[3] = analogRead(A3);
  au16data[4] = analogRead(A4);
  au16data[5] = analogRead(A5);
  au16data[6] = analogRead(A6);
  au16data[7] = analogRead(A7);
  analogWrite(pwm6, au16data[8]);
  analogWrite(pwm7, au16data[9]);
}

ComfileHMI - Human Machine Interface (HMI) Development Kit