You cannot use DSLRFocus to control as yet, because the driver for the 400D is deifferent to it's predecessor's. Regarding the DIY serial cable used for setting exposures longer than 30 seconds it works like a charm.
Software that I know does work is DSLR Shutter (timed exposures) and MAXDSLR (focus assistence and times exposures). Both these products require the DIY serial cable, instructions for which can be found on the DSLR Focus website.
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