| 摘要 |
<p>A system (1) for controlling a plurality of addressable electrical devices, e.g., light fittings (2, 3), comprises a processor (7), a controller (8) and routers (9a-9d). The processor (7) communicates with a PBX (6), so that an occupant can control the lighting in their area via a telephone network. The occupant's request is converted into a signal conforming to the DALI protocol using two DALI command strings. The address portion of a first command string is used to define a fitting group number and that of the second string is used to define a short address, providing 10 bits for defining the address of the fitting, thereby overcoming the limit of 64 addresses per highway (5) that is associated with the DALI protocol.</p> |
