Arduino Modbus Master HELP PLEASE

Using Arduino Networking, Protocols, and Devices
8

I found this code from the site below but I couldn't edit it according to my weight indicator. Can you help me with this? I just want to read the kg data at address 40001 according to dec 0, hex 0, plc address. 3 different data are read in this code. I added the weight indicator user manual.

M02 User's manual - weighing.pdf (1.1 MB)

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Ekran görüntüsü 2024-10-27 160652
Ekran görüntüsü 2024-10-27 160652409×303 26.7 KB

// github link: https://github.com/4-20ma/ModbusMaster
#include <ModbusMaster.h>

/* Modbus stuff */
#define MODBUS_DIR_PIN  5 // connect DR, RE pin of MAX485
#define MODBUS_RX_PIN 0 // Rx pin  
#define MODBUS_TX_PIN 1 // Tx pin 
#define MODBUS_SERIAL_BAUD 9600 // Baud rate for modbus rtu communication

// voltage, current and frequency register of Energy Meter
// if you want to read more parameters, then increase the array size
//and, write the address
uint16_t data_register[3] = {0x0000, 0x0008, 0x0036};

//Initialize the ModbusMaster object as node
ModbusMaster node;

// Pin 4 made high for Modbus transmision mode
void modbusPreTransmission()
{
  delay(500);
  digitalWrite(MODBUS_DIR_PIN, HIGH);
}

// Pin 4 made low for Modbus receive mode
void modbusPostTransmission()
{
  digitalWrite(MODBUS_DIR_PIN, LOW);
  delay(500);
}

void setup() {
  //we initialize the built-in hardware serial communication 
  //using the Serial.begin() function with two parameters.
  //The first parameter is the desired baud rate (9600 bits per second), 
  //and the second parameter is SERIAL_8E1, 
  //which specifies the data format (8 data bits, even parity, and 1 stop bit).
  //to set these two parameter, please read your sensor datasheet first
  Serial.begin(9600, SERIAL_8E1);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  pinMode(MODBUS_DIR_PIN, OUTPUT);
  digitalWrite(MODBUS_DIR_PIN, LOW);

  //modbus device slave ID 14
  node.begin(14, Serial);

//  callbacks allow us to configure the RS485 transceiver correctly
   node.preTransmission(modbusPreTransmission);
   node.postTransmission(modbusPostTransmission);
}

void loop()
{
    uint8_t result;
    //for store 32-bit data
    uint16_t data[2];
    int i;
    float reading;
    // this loop is to read voltage, current and power factor register of Energy Meter
    for(i=0; i<=2; i++){
      //Modbus function code (0x04) Read Input Registers according to energy meter datasheet
      result = node.readInputRegisters(data_register[i], 1);
     
        if (result == node.ku8MBSuccess) {
          Serial.println("Success, Received data: ");

          //Retrieve the data from getResponseBuffer(uint8_t u8Index) function.
          //that is return 16-bit data. our energy meter return 32-bit data everytime.
          //that's why, we take the value to a array called data
           data[0]=node.getResponseBuffer(0x00);
           data[1]=node.getResponseBuffer(0x01);
          
           //read voltage
           if(data_register[i] == 0x0000){
            Serial.print("Volatge: ");
            reading = *((float *)data);
            Serial.print(reading);
            Serial.println(" Volt");
           }
           //read current
           if(data_register[i] == 0x0008){
            Serial.print("Current: ");
            reading = *((float *)data);
            Serial.print(reading);
            Serial.println(" Amps");
           }
           //read Frequency
           if(data_register[i] == 0x0036){
            Serial.print("Frequency: ");
            reading = *((float *)data);
            Serial.print(reading);
            Serial.println(" Hz");
           }
        } else {
          Serial.print("Failed, Response Code: ");
          Serial.print(result, HEX);
          Serial.println("");
          delay(5000); 
        }
      
    }
  //one second delay
    delay(1000);
  }