Pinout of 4-pin XLR connector used for 12V power

The 4 pin male XLR connector is found on nearly all professional location video equipment. It is used for an external 12 volt DC input. Pinout:

pin 1 = negative
pin 4 = positive
No connections are made to either pin 2 or 3.

NOTE: Check and double check that the wiring is correct to your equipment before connecting this to any expensive video gear. Mistakes can be costly to you.