Variable transmission window system

摘要

The present application relates to an electrical control system for controlling a plurality of variable transmittance windows, comprising: a plurality of slave window control circuits each for controlling a transmittance of one or more of the plurality of variable transmittance windows; a plurality of user input mechanisms each coupled to one or more of said slave window control circuits; and a master control circuit coupled to said plurality of slave window control circuits, wherein: said master control circuit and said user input mechanisms are configured to supply transmittance state signals representing transmittance levels for the variable transmittance windows to said slave window control circuits; each slave window control circuit controls the transmittance of at least one of the variable transmittance windows in response to the transmittance state signals supplied by at least one of said master control circuit and one of said user input mechanisms; said master control circuit and slave window control circuits are configured such that when a transmittance state signal is provided to a slave window control circuit by said master control circuit, the transmittance state signal provided by said master control circuit is used by said slave window control circuit to determine the transmittance level of any variable transmittance window to which said slave window control circuit is coupled while overriding any transmittance state signal received from a user input mechanism.