... traffic control center through RS232(optional 1.Power voltage:AC 220V 50Hz.2.Power consumption:<5w.3.Working ... control, fix cycle, central control( optional),amber flash, light off ect.3 Auto protection for overload, short circuit, ... plans( 2phases 3, 3 phases 12, 4 phases 15, custom 14, fixed 3(light off, all red and amber ... access.( optional) 2-16 phases,44 outputs led traffic signal controller