Open Sound Control. Wikipedia page. Much like MIDI, a protocol originally developed for musicians to control synthesizers that has since found use in many other areas, specifically in lighting console control.
ETC's implimentation for the EOS and Cobalt console families: https://github.com/ETCLabs/
PC software for sending OSC messages to test OSC enabled hardware and software: https://www.da-share.com/software/da_osc/