But the hardware that is connected to it works fine. But when using software for it, and setting the specified parameters, it never works. Like when I'm programming a microcontroller, it works fine. I am able to program them via the com port. But when I'm using software to communicate back and forth with the comport. It never works. Some software I'm using says that there is a baud rate difference. Even when the baud rate and the software's baud rate is set the same. What else can be the problem?