modbus from serial to tcp

2020-02-27T15:51:42.479000Z

Depending on what board you use on the arduino, you could check out Mudbus. This has worked great for me in the past.

I used it to make a custom library for a Uno using Wifi shield and another for the Yun. http://www.verra.biz/free-downloads

If you need more help, I think you are better of posting it on the arduino forums

modbus from serial to tcp

2020-02-27T15:51:41.491000Z

Good morning,
In the enclosed place the code I use to control arduino (control) via codesys with mdbusrtu protocol.
Everything works perfectly!
Now I wanted to ask you how to modify this code to work on modbus tcp slave.
I found much code on the internet but it made me no confusion.
Could you help me?

Thank you, Alberto

\#include <Controllino.h>  /* Usage of CONTROLLINO library allows you to use CONTROLLINO_xx aliases in your sketch. */
\#include <ModbusRtu.h>
\#define ID 3
Modbus slave(ID, 0, 0); // this is slave ID and RS-232 or USB-FTDI
int8_t state = 0;
// data array for modbus network sharing
uint16_t au16data[9];
void setup() {
  io_setup(); // I/O settings
  slave.begin( 38400 );
}
void loop() {
  // poll messages
  state = slave.poll( au16data, 9 );
  io_poll();
} 
void io_setup() {
  //Set digital out
  pinMode(CONTROLLINO_R0, OUTPUT); // next to the digital output screw terminal 
  pinMode(CONTROLLINO_R1, OUTPUT); // next to the digital output screw terminal
  pinMode(CONTROLLINO_R2, OUTPUT); // next to the digital output screw terminal
  pinMode(CONTROLLINO_R3, OUTPUT); // next to the digital output screw terminal
  pinMode(CONTROLLINO_R4, OUTPUT); // next to the digital output screw terminal
  pinMode(CONTROLLINO_R5, OUTPUT); // next to the digital output screw terminal
  pinMode(CONTROLLINO_R6, OUTPUT); // next to the digital output screw terminal
  pinMode(CONTROLLINO_R7, OUTPUT); // next to the digital output screw terminal
  pinMode(CONTROLLINO_R8, OUTPUT); // next to the digital output screw terminal
  pinMode(CONTROLLINO_R9, OUTPUT); // next to the digital output screw terminal
  // Set analog in (used as digital)
  pinMode(CONTROLLINO_A0, INPUT);  // next to the analog input screw terminal
  pinMode(CONTROLLINO_A1, INPUT);  // next to the analog input screw terminal
  pinMode(CONTROLLINO_A2, INPUT);  // next to the analog input screw terminal
  pinMode(CONTROLLINO_A3, INPUT);  // next to the analog input screw terminal
  pinMode(CONTROLLINO_A4, INPUT);  // next to the analog input screw terminal
  pinMode(CONTROLLINO_A5, INPUT);  // next to the analog input screw terminal
  pinMode(CONTROLLINO_A6, INPUT);  // next to the analog input screw terminal
  pinMode(CONTROLLINO_A7, INPUT);  // next to the analog input screw terminal
  pinMode(CONTROLLINO_A8, INPUT);  // next to the analog input screw terminal
  pinMode(CONTROLLINO_A9, INPUT);  // next to the analog input screw terminal
}
void io_poll() {
  // get analog inputs -> au16data[0]
  bitWrite( au16data[0], 0, digitalRead(CONTROLLINO_A0));
  bitWrite( au16data[0], 1, digitalRead(CONTROLLINO_A1));
  bitWrite( au16data[0], 2, digitalRead(CONTROLLINO_A2));
  bitWrite( au16data[0], 3, digitalRead(CONTROLLINO_A3));
  bitWrite( au16data[0], 4, digitalRead(CONTROLLINO_A4));
  bitWrite( au16data[0], 5, digitalRead(CONTROLLINO_A5));
  bitWrite( au16data[0], 6, digitalRead(CONTROLLINO_A6));
  bitWrite( au16data[0], 7, digitalRead(CONTROLLINO_A7));
  bitWrite( au16data[0], 8, digitalRead(CONTROLLINO_A8));
  bitWrite( au16data[0], 9, digitalRead(CONTROLLINO_A9));
  //bitWrite( au16data[0], 10, digitalRead(CONTROLLINO_IN0));
  //bitWrite( au16data[0], 11, digitalRead(CONTROLLINO_IN1));
  // set digital outputs -> au16data[1]
  digitalWrite( CONTROLLINO_R0, bitRead( au16data[1], 0 ));
  digitalWrite( CONTROLLINO_R1, bitRead( au16data[1], 1 ));
  digitalWrite( CONTROLLINO_R2, bitRead( au16data[1], 2 ));
  digitalWrite( CONTROLLINO_R3, bitRead( au16data[1], 3 ));
  digitalWrite( CONTROLLINO_R4, bitRead( au16data[1], 4 ));
  digitalWrite( CONTROLLINO_R5, bitRead( au16data[1], 5 ));
  digitalWrite( CONTROLLINO_R6, bitRead( au16data[1], 6 ));
  digitalWrite( CONTROLLINO_R7, bitRead( au16data[1], 7 ));
  digitalWrite( CONTROLLINO_R8, bitRead( au16data[1], 8 ));
  digitalWrite( CONTROLLINO_R9, bitRead( au16data[1], 9 ));
  // diagnose communication
  au16data[6] = slave.getInCnt();
  au16data[7] = slave.getOutCnt();
  au16data[8] = slave.getErrCnt();
}

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