Signal Interface (SI) Comes With Seals & Connector | 80-911-0013-00Signal Interface (SI) with Seals & Connector 80 911 0013 00 The Signal Interface connects the CZone system to your external sensors, alarms and switching devices. The Signal Interface allows intelligent, automated operation of circuits depending on the state of the input. Accepts inputs from traditional switch types being used to control outputs. Accepts inputs from switches to trigger alarm i. e. high water float switch. Accepts inputs from industry