I understand (or am learning, rather) how both RS232 and USB work. What I am really curious about, and can not seem to find much information for, is what kind of disadvantages do USB to RS232 dongles have, if any? I understand driver issues and all of that, I mean is there any significant functionality of RS232 that is lost in the conversion, or can USB to RS232 conversions behave exactly like a native RS232 port?