How does communication between devices in the NOW System take place? 09 November 2021 09:26 Updated The Connection Unit communicates with IRSAP NOW devices via RF (radio frequency, 868Mhz). Related articles Connection Unit Setup and Configuration Wizard Where should the Connection Unit be installed? What do I need for the Connection Unit to work? The Connection Unit LED doesn't switch on, what should I do? I don't have an Ethernet cable, can I connect the Connection Unit to WiFi? Comments 0 comments Please sign in to leave a comment.