| 摘要 |
A multi-point, addressable control system for enviromental systems such as lighting economy systems, building maintenance systems for heating, ventating and air conditioning, comprises a central controller (1) connected by a signal bus (3) to receiver units (R1...R5), each unit being serially connected to the signal bus and being provided with a programmable memory (4), operatively connected to the signal bus, and a downlink signal bus isolating switch (S1...S5), connected in the signal bus and remotely controlled by the central controller (1); the memory of each unit can be sequentially accessed in the serial order of the units, a command from the central controller to any given receiver unit being to connect that unit's signal isolating switch and thereby enable control signals to be received by the next unit in the series: in an embodiment a continuous signal bus (2) and a configuration bus (3) are provided, the central controller (1) is arranged to transmit addressed control signals on the signal bus and programing and isolating down-link control signals are transmitted on the configuration bus and the receiver units (R1...R5) are each separately linked to the signal bus, serially linked to the configuration bus, have their programmable memories (4) operatively connected to the configuration bus and their down-link switches (S1...S5) arranged to isolate the configuration bus.
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