Wired Ethernet module has been supported since OpenSprinkler v3.2. This is implemented by using an external Ethernet module (ENC28J60 for OS 3.2, and W5500 for OS 3.3). If you have OpenSprinkler v3.2 and beyond, and your unit didn't come with a wired Ethernet module, you can add it separately. Refer to this document for steps required to install the module.