How to manage Serial data with Matlab/Simulink?

Good morning,

I'm facing this problem to solve with Matlab/Simulink.

I've an other program that can manage a DLL made with Simulink. The problem is that this program send the message(voltage waveform) in serial way to the DLL, therefore I've to create a function inside Simulink with an Input that receive this serial data and put it in a vector (maybe it is better to call it buffer).

These data are send with a certain sampling frequency.

It is a pleasure to get you suggestion.

Best regards.