An enhanced digital signal driver circuit that allows the driving of digital signals with a larger voltage swing than that which is typically allowed by the associated IC technology is provided. In particular, when a raster having a plurality of segments is used to write the code words of variable lengths into the data stream, the number of the code words which can be written starting at raster points is doubled, in the best case, such that the data stream of code words of variable lengths is robust toward a propagation of sequence errors. A passageway extends between the air collection space and an interior of the building and is located for passage of cooled ambient air from the air collection space into the interior of the building. The automation operates on multiple levels including; responsive safety functionality, one time action functionality, sporadically initiated timed action functionality, and periodically scheduled action functionality.