AT-Control Ethernet Interface Connecting the AT-Control to the Internet. With the Ethernet module, you can connect the AT-Control in a local LAN network directly with the Internet. Every computer, connected to the Internet can communicate with the AT-Control. The aquarist can control the actual values of all connected sensors and he can adjust the most important parameters via his web browser. It is as well possible to switch on and off the power sockets. Alarm notices can be sent by E-Mail to any E-Mail address.