Both the AMIRA "PL Mount" and the "B4 Mount" do include a 12-pin Hirose connector. When using a ENG style lens with PL mount (like the Fujinon Cabrio lenses or the Canon CN7x17) the cable is used to connect the lens with the camera body to provide power for the lens motors and to support certain functions on the handgrip of the lens. Power is also provided by the LDS contacts when using "PL LDS Mount".
When using a B4-mount lens either with the "PL to B4 Adapter" or the "B4 Mount", the...