DMX 5 Pin and 3 Pin Connector Difference Explained

The main reason we see 5 pin DMX connectors rather than 3 pin ones is to avoid confusion between DMX and Audio XLR cables, because using XLR cables for DMX can result in bad data transmission or even damage the equipments.  In most of the 5 Pin configurations the pin 4 and 5 are either not used or used for other datas, the pin 1, 2 and 3 are used exactly the same as the 3 pin version: Pin 1 +, Pin 2 -, Pin 3 Ground. 

You can buy 3 pin to 5 pin DMX convertor if you mainly use 3pin DMX cables or vice versa.