XLR connectors are most often found on microphone cables and DMX lighting cable, they are the most widely used connector to transfer balanced audio or DMX512 signal. Typically 3-pin and often referred to as a cannon plug. As well as being used for microphones and DMX lighting, XLR connectors are used on most pro audio equipment for the transfer of balanced line level signals or Lighting equipment for transfer DMX 512 signal.

They are popular due to their secure locking mechanism and robust design. 3 pins allow for the transfer of two signals and a ground along the one cable. This is essential for balanced audio. Typically pins 2 & 3 carry the hot and cold signals, while pin 1 carries the grounding signal.

For DMX lighting. 3 pin XLR connector allow for the transfer of two signals and a ground along the one cable. Typically pins 2 & 3 carry the Data – and Data + signals, while pin 1 carries the grounding signal. 5 pin XLR connector allow for the transfer of two channels signals and a ground along the one cable. This is essential for DMX lighting. Typically pins 2 & 3 carry the Data 1- and Data 1+ signals, pins 4 & 5 carry the Data 2- and Data 2+ signals, while pin 1 carries the grounding signal.