Splitting a DMX line

Use one of these

Don't just make a cable to do it. While you can trick it into working, I would never recommend it for anything show critical (like, say, your lighting control system).
 
Provided you use an opto-splitter, and not a Y-cable or two-fer, no problems at all.

From DFD's DMX512 Primer:
Splitting Never split a DMX signal with a "wye" cable. Use a splitter device that buffers each line separately or daisy chain from device to device.
The problem with splitting the signal with a wye cable is that the signal going up one leg of the wye is reflected back down and corrupts the signal going down the other leg. The longer the legs of the wye, the worse the problem. A wye where each leg is 10 feet may work fine but may fail if the legs are increased to 100 feet. A lot has to do with the quality of the cable, the strength of the signal at the wye point, and your relationship with God.
If you must split the signal, and you don't have a buffered splitter, do it as close to the source as possible, i.e. at the console. If you have an isolator available, place the wye at the output of the isolator. If you have two isolators available, place the wye at the input to the two isolators (which is like making your own splitter).
 

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