**Modbus Communication** rev_01

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    - Project: **Modbus Communication**
    - Source Code NOT compiled for: ESP8266 NodeMCU V1.0
    - Source Code created on: 2024-11-28 05:25:27

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Implement a Modbus communication protocol to */
    /* enable data exchange between Arduino and Modbus- */
    /* compatible devices, ensuring reliable and */
    /* efficient control of connected components. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <ModbusMaster.h>   //https://github.com/4-20ma/ModbusMaster
//#include <SoftwareSerial.h> // SoftwareSerial is not compatible with ESP8266 as it doesn't support multiple serial ports like Arduino

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
ModbusMaster node;

// Define MODBUS_SERIAL to use the default Serial for ESP8266
#define MODBUS_SERIAL Serial

void setup(void)
{
    Serial.begin(115200);
    MODBUS_SERIAL.begin(115200, SERIAL_8N1, 14, 27);  // IO14: RX, IO27: TX
    node.begin(1, MODBUS_SERIAL); // Initialize Modbus master with slave ID of 1
}

void loop(void)
{
    uint8_t result; // Variable to hold the result of the Modbus request
    uint16_t data[10]; // Buffer to hold the data

    result = node.readHoldingRegisters(0, 1); // Read one holding register from address 0
    if (result == node.ku8MBSuccess) { // Check if the read was successful
        Serial.print("Flow Rate: ");
        Serial.println(node.getResponseBuffer(0)); // Print the value of the first holding register
    } else {
        Serial.print("Error reading Flow Rate: ");
        Serial.println(result); // Print the error code
    }

    delay(2000);  // Wait for 2 seconds before the next loop iteration
}

/* END CODE */