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#include "Canopus_Modbus.h"
ModbusMaster node;
#include <Rak3172_Canopus.h>
#define V_RS485 PB12

#define V1
uint8_t result;
void setup()
{
  pinMode(V_RS485, PWR_ON);
  pinMode(PB2, OUTPUT);
  Serial.begin(115200);
  Serial.print("\r\n*****************RAK3172_CANOPUS*******************");
  Serial_Canopus.begin(9600, SERIAL_8N1);
}
void loop()
{
  //***************READ node 1**************************
  node.begin(1, Serial_Canopus); //slave ID node
  Serial.printf("");
  Serial.printf("\r\n\n\nExample read modbus RTU for RAK3172_Canopus board");

  result = node.readHoldingRegisters(0, 1);//Read 40000 to 40009
  delay(10);
  if (result == node.ku8MBSuccess) //Read success
  {
    for (uint8_t i = 0; i < 10; i ++ )
    {
      Serial.printf("\r\nValue 4000%d: %d", i, node.getResponseBuffer(i));
    }
  }
  else Serial.print("Read Fail node 1"); //read fail
  digitalWrite(PB2, !digitalRead(PB2)); //blink led
  delay(500);
}

#include <Rak3172_Canopus.h>  // Include the Rak3172_Canopus library header file.
#include "Canopus_Modbus.h"
#include "Rak3172_Canopus.h"
#define V1
#define RS485_VCC PB12

byte Temp[] = {0x01, 0x03, 0x00, 0x00, 0x00, 0x01, 0x84, 0x0a};
byte responseBuffer[50]; // Taille du tampon de réponse
float Value, Val1;

void setup() {
  Serial.begin(115200);
  Serial_Canopus.begin(9600, SERIAL_8N1);
  pinMode(RS485_VCC, OUTPUT);
  digitalWrite(RS485_VCC, PWR_ON);  //On power Vrs485
  //pinMode(V_SS5, PWR_ON);
}

float temp(){
//  node.begin(1, Serial_Canopus); //slave ID node
  RS485_Tranmit;
  Serial_Canopus.write(Temp, sizeof(Temp));// Envoyer la requête au capteur

  // Lire la réponse
  RS485_Receive;
  delay(200);
  int responseLength = Serial_Canopus.available();
  if (responseLength > 0) {
    for (int i = 0; i < responseLength; i++) {
      responseBuffer[i] = Serial_Canopus.read();
    }
      Value = (responseBuffer[3] << 8) | responseBuffer[4];
      Value = Value/100;
      Serial.print("temperature : ");
      Serial.print(Value);
      Serial.println(" °C");
  } else {
    Serial.println("Aucune réponse reçue.");
  }

  return Value;
}

void loop() {

  Serial.println("________________________");
  temp();
  delay(1000);

}

 Hi, NamNamIoT !
    I’m workig with a RAK3172_CANOPUS  using  Arduino IDE. 
    It compiles ok, then uploads it to my board but fails. as shown below:
    ![Detect baudrate fail](https://github.com/NamNamIoT/RAK3172_CANOPUS/assets/163369668/6141faac-5e59-4990-88fa- 
    c59bbc56dd25)
    Previously, I successfully loaded the code with STM32CubeProgrammer and switched to loading with Arduino IDE but encountered 
    this error.
   Boards that have never been loaded with STM32CubeProgrammer will still operate normally.
   Hope to receive help from you !!! 
   Thanks.