Power line modem with micro serial servo controller?

I’m considering using one of these a power line communcations modem like this:


with a Micro Serial Servo Controller for a robotics project I’m working on. My robot is tethered to the base station with an power line umbilical cable, so being able to send RS232 data down the power line helps reduce the size/weight of the umbilical. Does anyone have any experience with these or can offer any advice on using them?