There are three steps which commonly cause people problems with connecting these relays. The first thing to do is to install the proper driver for the relay. This is especially important for Windows 8. Attached is a pdf on installing the proper driver. Once that has been installed correctly, navigate to the Windows Device Manager in your Control Panel. Open up your Ports (COM & LPT) and make a note of which COM port has been assigned to the relay (it must be plugged in to your USB to determine this). Finally open the Zelio Soft 2 software, and open the Communication Configuration under the drop down menu for Transfer. Manually type in the COM port that has been assigned to your relay and test the connection to ensure it is communicating appropriately. That should solve your communication issue. For additional questions or assistance, contact product support at 1-888-SQUARED.