Some elements of the "Oka" are still state/trade secrets, so you may not be able to answer your question soon. I am thinking there is a reusable data link with the missile, either wireless or friction, that is used to program the missile. It may also be programed by a hand portable unit as the missile has inertial guidance with active radar for the terminal phase. Far too many questions...
But from the pictures, some of which look like field firing trials, I would say there is no visible wiring bus.