Open Device Manager in Control Panel, then double-click on the Communications Port (COMXX) that the EFT is connected to.
On the Port Settings tab, change the Bits per second value to match the value shown when setting up the Pinpad connection in Ocius Sentinel (by default this is 115200), and then click on OK.
Click on the Advanced button, set the Receive Buffer value to 4 (8 for Yuno terminals), and then click on OK.
Note that this is not needed if the BIOS has been updated on a Yuno.