int SerialPort::ReadData(unsigned char *buffer, const int buffer_size) // reads from port into buffer amount of bytes specified //by buffer_size 
{
    if(idCom == 0) return -1; //port is not opened
    unsigned long nbread;
    Sleep(100); // wait to meet COM port requirements
    if(!ReadFile(idCom, buffer, COMMAND_LENGTH, &nbread, NULL)) return -2; //if were errors during reading
    if(nbread != COMMAND_LENGTH) return -3; //if wrong amount of bytes was read
    return 0;
}

int SerialPort::WriteData(unsigned char *buffer, const int buffer_size) // writes into port from buffer amount of bytes specified by buffer_size 
{
    if(idCom == 0) return -1; //port not opened
    unsigned long nbread;
    Sleep(100); // wait to meet COM port requirements
    PurgeComm(idCom,PURGE_TXCLEAR); // clear output buffer
    // serial pooling
    if(!WriteFile(idCom, buffer, buffer_size, &nbread, NULL)) return -1; 

    PurgeComm(idCom,PURGE_RXCLEAR); // clear input buffer
    return 0;
}

    for (int k=0;k<50; k++)
    {

        line[0]= 0xF0; 
        line[1]= 0x23; 
        line[2]= 0x52; 
        line[3]= 0x35; 
        
        memcpy(line_to_compare, line, COMMAND_LENGTH);
        p_SerialPort->WriteData(line,COMMAND_LENGTH); //reset
        read_result = p_SerialPort->ReadData(line,COMMAND_LENGTH);
    }
    
    return 0;
}

int SerialPort::OpenPort(unsigned port)// Opens COM port with number "port"
    {

        char pcPort [5];
        sprintf(pcPort,"%s%i","COM",port);
        idCom = CreateFile(pcPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
        if(idCom == INVALID_HANDLE_VALUE) return -1; // if cannot open COM port
        if(!SetupComm(idCom, 4096, 4096)) return -3; // if cannot set port parameters 
        if(!GetCommState(idCom, &dcb)) return -3;  // loading "dcb" by default values 
    
        dcb.ByteSize = 8;
        dcb.BaudRate = 115200;
//        dcb.BaudRate = 1200;

        dcb.Parity = NOPARITY;
        dcb.StopBits = ONESTOPBIT;
        dcb.fDtrControl = DTR_CONTROL_DISABLE;
        if(!SetCommState(idCom, &dcb)) return -3; // if cannot set port parameters 

        if(!GetCommState(idCom, &dcb)) return -3; // if cannot set port parameters 

        if(!PurgeComm(idCom,PURGE_RXCLEAR)) return -3; // clear input   buffer
        if(!PurgeComm(idCom,PURGE_TXCLEAR)) return -3; // clear output  buffer

        return 0;
}

A__>>int SerialPort::OpenPort(unsigned port)// Opens COM port with number "port"
A__>>    {

A__>>        char pcPort [5];
A__>>        sprintf(pcPort,"%s%i","COM",port);
A__>>        idCom = CreateFile(pcPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
A__>>        if(idCom == INVALID_HANDLE_VALUE) return -1; // if cannot open COM port
A__>>        if(!SetupComm(idCom, 4096, 4096)) return -3; // if cannot set port parameters 
A__>>        if(!GetCommState(idCom, &dcb)) return -3;  // loading "dcb" by default values 
    
A__>>        dcb.ByteSize = 8;
A__>>        dcb.BaudRate = 115200;
A__>>//        dcb.BaudRate = 1200;

A__>>        dcb.Parity = NOPARITY;
A__>>        dcb.StopBits = ONESTOPBIT;
A__>>        dcb.fDtrControl = DTR_CONTROL_DISABLE;
A__>>        if(!SetCommState(idCom, &dcb)) return -3; // if cannot set port parameters 

A__>>        if(!GetCommState(idCom, &dcb)) return -3; // if cannot set port parameters 

A__>>        if(!PurgeComm(idCom,PURGE_RXCLEAR)) return -3; // clear input   buffer
A__>>        if(!PurgeComm(idCom,PURGE_TXCLEAR)) return -3; // clear output  buffer

A__>>        return 0;
A__>>}
A__>>

int SerialPort::SetReadTimeOut(unsigned long wait_time)//sets maximal time of waiting response from the board
{

    if(!GetCommTimeouts(idCom, &timeouts)) return -3;  // loading "timeouts" by default values 

    timeouts.ReadTotalTimeoutConstant = wait_time;
    timeouts.ReadIntervalTimeout = MAXDWORD;
    timeouts.ReadTotalTimeoutMultiplier = MAXDWORD;

    if(!SetCommTimeouts(idCom, &timeouts))return -3; //setting new timeout value
    

    return 0;
}

p_SerialPort->SetReadTimeOut(5000)