Reconfigurable generic interface

You cannot connect it like this.

Imagine the parameter dictates the number of pins on your device - you cannot expect the number of pins to change in real time.

So you need to create a register inside your sub component that stores the timing value that is written from the RS232. This will be at some address of some kind, so you'll need an address decoder. And then you'll need some sort of protocol to understand register writes from the RS232.