The V-mount Distributor Box for Sony FX9 from Movcam features both a Gold mount plate and a 4-pin XLR port for powering the camera. Either can be used, as you find most appropriate. Attaching to the back of the camera, the Distributor Box delivers 19.5V to the camera. The XLR port delivers 19.5V directly. When using a Gold mount battery, the battery's output is converted to 19.5V.
The V-mount Distributor Box features two 12V D-Tap ports, two 14.4V 2-pin LEMO ports, and the above-mentioned 4-pin XLR DC input, which is on the bottom rear of the unit, right under the battery plate.