I use the Somfy Universal RTS Interface. It has an RS232 input and can control 5 channels (any number of shades on one channel). I drive it from the Pronto (RFX9600), from an ELAN (SS1) and from Vantage (InFusion). It is neat to lower shades automatically at sunset (which the Infusion controller does well). I am also planning to program the shades in some areas to lower if it becomes too hot on a sunny day.
