The transmitters for use with FS One should be self-powered.
Futaba buddy boxes, which can be powered through the trainer cord will not work because the FS One V2 USB Interface cannot power them. The FS One USB only supplies 5V DC, while Futaba buddy boxes require 9V.
As far as we are aware, only Futaba buddy boxes can be powered through the buddy cord, but again the required voltage is higher than that supplied by the FS One V2 USB Interface.
TacCon controllers from previous the version of FS One are supported. They are powered by 5V and do not exceed the USB current limit of 500mA.