Articles in this category Does the DMX Sniffer/Sender test all 5 pins? The DMX Sniffer/Sender test pins 1-3 on a 5 pin DMX connector. Pins 4 and 5 are not tested. The XLR Sniffer/Sender will also work on 3 pin DMX cables. The LED’s on my DMX Sniffer/Sender are showing all red when plugged directly into each other. Is it broken? Typically this occurs when the batteries are put in backward. Reversing its position will return it to all green. Can you test 3 pin DMX cables with the XLR Sniffer/Sender? Absolutely. The SoundTools XLR Sniffer/Sender will test your 3 pin DMX cable for continuity, ensuring you're cables are ready for the next gig.