Only one piece of software connecting to an ENTTEC DMX USB Device or Art-Net Universe should ever be active on a single computer at a time, (this includes ENTTEC’s EMU, Pro Manager, Pro Utility, NMU and ELM software and any other 3rd party application).
If you have multiple pieces of DMX software open, they could compete for your DMX USB device or occupy the network port settings required by EMU to output Art-Net resulting in Output Error dialogues.
If you realize you have more than one piece of software using these resources, close all other software besides EMU, and press the ‘Rescan for devices’ button before disabling and re-enabling each output.
Computer Firewall – To receive an ArtPoll response in MacOS the firewall must be turned off to accept broadcast UDP packets (ArtPoll).
For further assistance on troubleshooting the DMX USB Pro please see the guides below.