| 摘要 |
<p>A system for selectively operating a plurality of appliances connected in parallel with one another and with a power supply via single cable which carries control signals of differing characteristics generated from a control signal source, wherein each appliance has an associated control device also powered from the power supply, said control devices being connected in series to provide a control signal-carrying line thereof, and each appiance control device has means for discriminating between control signals of different characteristics and has means for routing the control signals accordingly so that one or more selected appliances are operated in dependence on the characteristic of an arriving signal.</p> |
