The Promote Control can send a command by USB or shutter cable to another device. It can also receive start commands by its sensor port. This allows for building complex systems involving motion control time-lapse and wireless functionality. Some specific examples are shown below.
Integrate your Promote Control with MX-2 motion controller for HDR time-lapses. http://www.dynamicperception.com/
Pair the Promote Control with eMotimo spectrum ST4. The Promote Control manages your exposure ramping while spectrum ST4 keeps your moves buttery smooth. http://emotimo.com/
Pair your Promote Control with Cinetics Motion Control Systems to capture moving HDR time-lapses. https://cinetics.com/
Pair you Promote control with the GigaPan EPIC Pro for HDR and focus-stacked panoramas. http://www.omegabrandess.com/Gigapan