I would like to connect multiple devices using DMX512 protocol. I would like to use the same cable for both power (12V, each device draws around 10W) and communication. For power I need 2 wires and for DMX512 I need 3 wires (Sig+, Sig-, GND).
Generally, a 5 wire cable would do the trick but my question, could this also work with 4 wires were Power GND and DMX512 GND share the same wire?
Power supply is a 'good' switchable PSU and the end devices are LED drivers so I don't expect any spikes, transients, sags or other power 'artifacts'.