read() not returning Specified amount of Bytes

I am reading the Sensor data (broadcasted on RS232) with read() function. The data rate is 264 Bytes / Sec.

I am using the following code to read the data (I just needed to read 60 Bytes).

int BytesToRead = 60;
unsigned char* iBuffer = new unsigned char[BytesToRead];
int ret = read(COM, iBuffer, BytesToRead);

cout<<ret<<endl;    

if (ret == 0) {
cout<<"Error Reading COM Port"<<endl;
exit(EXIT_FAILURE);         // Error Handling
} 
delete[] iBufer;

And this program is returning random bytes (~30).

I am a beginner for C++ programming. Sorry, If I am doing some stupid mistake.

Thanks.

My COM function:

int Connect(const char *DeviceName){

long BAUD = B115200;
long DATABITS = CS8;            // CS8 = 8n1 Config.(8 bits, No parity, 1 Stop Bit)
long VMIN_CC = 1;           // 1 input byte is enough to return from read()
long VTIME_CC = 0;          // Inter-character timer
long STOPBITS = 0;          // Defined with CS8
long PARITYON = 0;          // NONE (Ref.: IH2 Azzura Hand User Guide)
long PARITY = 0;            // NONE (Ref.: IH2 Azzura Hand User Guide)


struct termios config;          // Configuration of the termios structure
fd_set rdset;               // File discription set

//Basic serial interface configuration  
//iflag = Input flag || oflag = Output flag || lflag = No-line processing flag
//c_cflag = Caracter processing flag || c_cc = Special character flag

memset(&config,0,sizeof(config));
config.c_iflag = 0;             // Turning OFF Input processing
config.c_oflag = 0;             // Turning OFF Output processing
config.c_lflag = 0; 
config.c_cflag = DATABITS |CREAD|CLOCAL;// Enable the receiver and set local mode
config.c_cc[VMIN] = VMIN_CC;        
config.c_cc[VTIME] = VTIME_CC;      

//Opening the Port for communication
int com = open(DeviceName, O_RDWR | O_NOCTTY);

//Error Handling    
if (com < 0) {
cout<<"ERROR!! Opening Port \n"<<"Sys:"<<strerror(errno)<<endl;
exit(EXIT_FAILURE);
} else {cout<<"Serial Communication (Opening Port): "<<strerror(errno)<<endl;}

//Setting the BaudRate for Communcation
cfsetispeed(&config, BAUD);
cfsetospeed(&config, BAUD);

//Applying Configuration / Attributes
int Attr = tcsetattr(com, TCSANOW, &config);

//Error Handling
if(Attr < 0){
    cout<<"ERROR!! Setting Attributes \n"<<"Sys:"<< strerror(errno)<<endl;
    exit(EXIT_FAILURE);
    } else {cout<<"Serial Communication (Setting Attributes): "<<strerror(errno)<<endl;}

return(com);

}