On the LE, the DMX 1 output is simply a splitter output so what goes in on the DMX in comes out there, noise and all. The DMX 2 out OTOH, is a regenerated output. Here are a few things to keep in mind. If you are using the wireless module on the LE, the DMX 2 output is the only output that will work on that LE, The DMX 1 out and the DMX in are wired in parallel to each other so if there is no signal on the DMX in jack, then there is no signal out on the DMX 1 out either. The termination jumper is directly related to the DMX 1 out connector. If you have a line connected to the DMX 1 out, then the terminator is off, if not, then it needs to be set to on, regardless of what is happening with DMX 2.