read_modbus_float

#include <ModbusMaster.h>

ModbusMaster node;

// Struktur Union untuk konversi Float (32-bit)
union FloatConverter {
  uint16_t regs[2];
  float value;
};

// Struktur Union untuk konversi Unsigned Long / uint32_t (32-bit)
union UlongConverter {
  uint16_t regs[2];
  uint32_t value;
};

void setup() {
  Serial.begin(115200);
  // node.begin(1, Serial2); // Sesuaikan ID Slave dan Serial Modbus Anda
}

void loop() {
  // Ambil data setiap 5 detik
  bacaPrimaryActiveEnergy();
  bacaSecondaryActiveEnergy();

  Serial.println("--------------------------------------------");
  delay(5000);
}

// ====================================================================
// CONTOH 1: Membaca Sisi PRIMARY SIDE (Tipe Data: Float)
// ====================================================================
void bacaPrimaryActiveEnergy() {
  // Alamat 0x008A (Total positive active energy - Primary)
  uint8_t result = node.readHoldingRegisters(0x008A, 2);

  if (result == node.ku8MBSuccess) {
    FloatConverter dataPrimary;

    // Sesuaikan urutan word (Big-Endian format)
    dataPrimary.regs[1] = node.getResponseBuffer(0); // High Word
    dataPrimary.regs[0] = node.getResponseBuffer(1); // Low Word

    float kwh_primary = dataPrimary.value;

    Serial.print("[PRIMARY] Total Positive Active Energy: ");
    Serial.print(kwh_primary, 2);
    Serial.println(" kWh (Nilai aktual lapangan)");
  } else {
    Serial.printf("[PRIMARY] Gagal membaca register! Error: 0x%02X\n", result);
  }
}

// ====================================================================
// CONTOH 2: Membaca Sisi SECONDARY SIDE (Tipe Data: Ulong)
// ====================================================================
void bacaSecondaryActiveEnergy() {
  // Alamat 0x0082 (Total positive active energy - Secondary)
  uint8_t result = node.readHoldingRegisters(0x0082, 2);

  if (result == node.ku8MBSuccess) {
    UlongConverter dataSecondary;

    // Gabungkan bitwise atau menggunakan union
    dataSecondary.regs[1] = node.getResponseBuffer(0); // High Word
    dataSecondary.regs[0] = node.getResponseBuffer(1); // Low Word

    uint32_t raw_value = dataSecondary.value;

    // Sesuai keterangan di datasheet: dikali faktor skala 0.001
    float kwh_secondary = (float)raw_value * 0.001;

    Serial.print("[SECONDARY] Raw Value: ");
    Serial.print(raw_value);
    Serial.print(" | Terkonversi: ");
    Serial.print(kwh_secondary, 3);
    Serial.println(" kWh (Sisi Sekunder Sensor)");
  } else {
    Serial.printf("[SECONDARY] Gagal membaca register! Error: 0x%02X\n", result);
  }
}