This USB to serial converter is very useful where there is no physical RS232 port or COM port is available & you want to communicate with a system where only RS232 port is available. This converter presents itself to computer as if it is a COM port. It’s behaviour is as good as a “real” COM port. All the data lines available to 9 pin actual COM port are brought out as a real port.
The software inside the converter not only emulates itself as a COM port but it also interprets the data from one standard- USB – to other that is RS232 standard.