Hi, This sounds like a good way I might experiment with - I guess you mean create it with a sort of potential divider, so if the 120
hm: resistor is present it will cause a voltage drop. Do you have a schematic of how this would be arranged? As DMX is a fast signal that needs to be constantly carrying data though I don't quite understand how it would fit in as there is no opportunity to check really. Ideally I want it to be continuously checking and alert as soon as the termination is added or removed.