I am looking for a cable standard to control and power a device from its controller. 

I need to send 5V/10A but also control (not sure yet what protocol it could be but I don't need a high speed, 9600b serial could be enough) over short distance (about 2m.) I looked up PoE but it's really not enough in terms of power. Ideally I don't want something too exotic and hard to find.