Connecting Elmeasure LG+5310 to Arduino Mega

Using Arduino Project Guidance
1

Any one let you know if my code was correct plz

#include

// Define RS485 control pins
#define MAX485_DE 3
#define MAX485_RE_NEG 2

// Create ModbusMaster instance
ModbusMaster node;

// Function for enabling transmission mode
void preTransmission() {
digitalWrite(MAX485_RE_NEG, 1);
digitalWrite(MAX485_DE, 1);
}

// Function for enabling reception mode
void postTransmission() {
digitalWrite(MAX485_RE_NEG, 0);
digitalWrite(MAX485_DE, 0);
}

void setup() {
// Initialize control pins for RS485
pinMode(MAX485_RE_NEG, OUTPUT);
pinMode(MAX485_DE, OUTPUT);

// Set initial mode to receive
digitalWrite(MAX485_RE_NEG, 0);
digitalWrite(MAX485_DE, 0);

// Initialize serial communication for Modbus
Serial.begin(9600); // Use your selected baud rate
Serial1.begin(9600, SERIAL_8E1); // Baud rate, Even parity, 1 stop bit

// Start Modbus communication with Slave ID 1
node.begin(1, Serial1);

// Set transmission and reception callback functions
node.preTransmission(preTransmission);
node.postTransmission(postTransmission);
}

void loop() {
uint8_t result;
float value;
uint32_t longValue;

// Array of register start addresses as per the communication map
uint16_t startAddress[] = {40101, 40103, 40105, 40107, 40109, 40111, 40113, 40115, 40117, 40119,
40121, 40123, 40125, 40127, 40129, 40131, 40133, 40135, 40137, 40139,
40141, 40143, 40145, 40147, 40149, 40151, 40153, 40155, 40157, 40159, 40217};
int numParameters = sizeof(startAddress) / sizeof(startAddress[0]);

for (int i = 0; i < numParameters; i++) {
if (i < 30) { // For float values (read 2 registers)
result = node.readHoldingRegisters(startAddress[i] - 40001, 2);
if (result == node.ku8MBSuccess) {
uint32_t rawData = ((uint32_t)node.getResponseBuffer(0) << 16) | node.getResponseBuffer(1);
memcpy(&value, &rawData, sizeof(value)); // Convert raw data to float
Serial.print("Parameter ");
Serial.print(i + 1);
Serial.print(": ");
Serial.println(value, 4); // Print float value with 4 decimal places
} else {
Serial.print("Read Error at parameter ");
Serial.print(i + 1);
Serial.print(", Error Code: ");
Serial.println(result);
}
} else { // For Unsigned long value (Load Hours Received)
result = node.readHoldingRegisters(startAddress[i] - 40001, 2);
if (result == node.ku8MBSuccess) {
longValue = ((uint32_t)node.getResponseBuffer(0) << 16) | node.getResponseBuffer(1);
Serial.print("Load Hours Received: ");
Serial.println(longValue);
} else {
Serial.print("Read Error at Load Hours Received, Error Code: ");
Serial.println(result);
}
}

delay(500);  // Delay between reading each parameter

}

delay(5000); // Delay before the next loop
}

I can try to get data from LG+5310 using Arduino

2

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