Every Red controller and expansion board features a built-in network input. When a CAT5 or CAT6 is plugged in, the controller will automatically be discovered and communicate with any other controller on the network. In addition, Red boards are built to be modular. Meaning you can choose alternative methods of communication from controller to controller using PDK’s plug-and-play module kits. Plug-and-play connection options are available with our Red PoE++ Kit making installations faster and easier than ever before. Each module plugs seamlessly into the door controller and is instantly ready to go. With PoE, you automatically save on cable runs and can fully power up to 4 doors, making PDK controllers the most flexible and intuitive controllers on the market today!