Hello José,
Based on my understanding of your issue, it seems that you are facing difficulties reading data from a serial port using Port FTDI USB to Serial RS232 Adapter Cable. Specifically, you are encountering empty data.
Typically, users configure a FIFO read block in their model's serial I/O to execute faster than the model receives data. This configuration helps prevent the receive FIFO buffer from overflowing. However, it is important to consider the possibility that a FIFO Read block may not have a message on its output which may cause empty data.
The receive FIFOs may have too few characters for a FIFO read operation. In such cases, a model that receives serial I/O can have a FIFO Read block that handles this situation. Depending on your configuration, the FIFO Read block can either return the last message it received or return a zero-length message.
To get a better understanding about handling a FIFO Read block that does not have a message on its output, please refer to the following MATLAB documentation: RS-232 Legacy Drivers - MATLAB & Simulink (mathworks.com).
I hope this information helps you resolve your issue.
Thanks,
Sachin
