When several EVEREST 290 units are cascaded, the individual units must communicate with each other. For this purpose, a gateway panel must be used (a KGR5-Kp (PAE GPE) kit if the system consists of 2 to 5 units, or a KGR10-Kp (PAE GPE) kit if the system consists of 6 to 10 units) to which each unit must be connected via an RJ45 ETHERNET data cable. In addition to cascade communication, the KGR cards also offer the possibility of connecting the system to a Wi-Fi network.