After connecting device, supply power to I/O Controller Unit from connector.
I/O Controller Unit have a CPU inside, the program of firmware is loaded and be executed after power is supplied.
There are several seconds before the device can be accessed after firmware is executed.
When I/O Assist Sever is used, after supplying power to I/O Controller Unit, it takes about 20 seconds that I/O Assist Sever detects I/O Controller Unit and then device can be accessed.