I have a tool at the end of a 200m cable. Through this cable I am powering a 50kW/3,000V and a 1kW/480V motor, both with VFDs. So there is going to be a lot of noise in that cable. I need to communicate with the tool through the same cable. The comms bus conductors are 2 shielded twisted pair (3 pairs). Is there any industrial comms over copper that have a chance of communicating in the midst of all that EMI? I really don't want to use fiber optics.