ESP32 cannot read data from SELEC MFM383A Multifunction Meter

[minhcn]

Hi guys,
I have problem in reading data from SELEC MFM383A Multifunction Meter
My hardware includes: ESP32 <-> TTL to RS485 <-> SELEC MFM383A Multifunction Meter.
I use ModbusRtu.h library to read data from SELEC MFM383A (GitHub - smarmengol/Modbus-Master-Slave-for-Arduino: Modbus Master-Slave library for Arduino).
I can read V1, V2, V3 but I can not read Power Factor1, Power Factor 2, Power Factor 3, Frequency, Power (all above values = 0). I don't understand what wrong in my code.
Thank you for your attention.
My code

#include <ModbusRtu.h>

union Fu {
  float f;
  uint32_t u;
};
// data array for modbus network sharing
uint16_t au16data[64];  
uint8_t u8state;
uint8_t u8query = 0;


Modbus master(0, Serial2, 0);  // this is master and RS-232 or USB-FTDI  / Serial2
//UART2          RX2: GPIO16        TX2: GPIO17

modbus_t telegram[2];  

unsigned long u32wait;

void setup() {
  Serial.begin(9600); 
  Serial2.begin(9600);
  master.start();
  master.setTimeOut(2000);  // if there is no answer in 2000 ms, roll over
  u32wait = millis() + 1000;
  u8state = 0;

  telegram[0].u8id = 1;            // slave address
  telegram[0].u8fct = 4;           // function code 04 (this one is registers read)
  telegram[0].u16RegAdd = 0;       // start address in slave
  telegram[0].u16CoilsNo = 64;     // number of elements (coils or registers) to read
  telegram[0].au16reg = au16data;  // pointer to a memory array in the Arduino

  
}

void loop() {
  switch (u8state) {
    case 0:
      if (millis() > u32wait) u8state++;  // wait state
      break;
    case 1:
      master.query(telegram[u8query]);  // send query (only once)
      u8state++;
      break;
    case 2:
      master.poll();  // check incoming messages
      if (master.getState() == COM_IDLE) {
        u8state = 0;
        u8query++;
        if (u8query > 0) {
          u8query = 0;
        }
        u32wait = millis() + 100;
      }
      break;
  }
  readDataFromSelec();

}
void readDataFromSelec(){
    //Read V1 
  float v1n = decodeFloat(au16data[0], au16data[1]);
  Serial.print("V1: ");
  Serial.print(v1n);
  Serial.print(" | ");
  //Read V2
  float v2n = decodeFloat(au16data[2], au16data[3]);
  Serial.print("V2: ");
  Serial.print(v2n);
  Serial.print(" | ");
  //Read V2
  float v3n = decodeFloat(au16data[4], au16data[5]);
  Serial.print("V3: ");
  Serial.print(v3n);
  Serial.print(" | ");
  //Read I1 
  float i1 = decodeFloat(au16data[16], au16data[17]);
  Serial.print("I1: ");
  Serial.print(i1);
  Serial.print(" | ");
  //Read I2
  float i2 = decodeFloat(au16data[18], au16data[19]);
  Serial.print("I2: ");
  Serial.print(i2);
  Serial.print(" | ");
  //Read I3
  float i3 = decodeFloat(au16data[20], au16data[21]);
  Serial.print("I3: ");
  Serial.print(i3);
  Serial.print(" | ");
  //Read Power Factor 1
  float pf1 = decodeFloat(au16data[48], au16data[49]);
  Serial.print("PF1: ");
  Serial.print(pf1);
  Serial.print(" | ");
  //Power Factor 2
  float pf2 = decodeFloat(au16data[50], au16data[51]);
  Serial.print("PF2: ");
  Serial.print(pf2);
  Serial.print(" | ");
  //Power Factor 3
  float pf3 = decodeFloat(au16data[52], au16data[53]);
  Serial.print("PF3: ");
  Serial.print(pf3);
  Serial.print(" | ");

  //Read Frequency 
  float f = decodeFloat(au16data[56], au16data[57]);
  Serial.print("f: ");
  Serial.print(f);
  Serial.print(" | ");
  //Read P (kWh)
  float P = decodeFloat(au16data[58], au16data[59]);
  Serial.print("P: ");
  Serial.print(P);
  Serial.println(" | ");
}
float decodeFloat(uint16_t regs_1, uint16_t regs_2) {
  union Fu fu;

  fu.u = ((uint32_t)regs_2 << 16) | regs_1;
  return fu.f;

}