[PDF] FIBARO SInGlE/DOuBlE SWITCH 2 - Home - Digital Home single switch double switch Wiring diagrams - Single Switch 2 NOTE Switch connected to the S1 terminal is a master switch. It acti-vates the basic func-tionality of the device (turning the first load on/off) and activates the learning mode (adding/removing). The switch connect-ed to the S2 ter-minal turns on/of the second load in Double Switch 2,