Answer by  
                                                                                          samir28 (3)
                                                            
                          
                          
                                                           Those serial protocols work on serial bus(plain old). And just like with other computers, a reliable way of transferring data with Arduinos is needed.
 
 I do not completely understand what you mean by your post, but there are two ways to handle data flow, hardware and soft. I think hardware flow control cant be used