What is the polarity on the Crossbow DC jack?

The Crossbow uses a center-positive, 2.1mm locking-barrel DC connector. We offer two power cable options currently. Click here to see the PTap and 2-Pin cables.

2.1mm locking-barrel to PTap power cable.
Length: 24in/61cm

OR

2.1mm locking-barrel to 2-Pin 12v power connector. Arri Alexa compatible polarity. The connector is ARRI Standard [FGG.0B.302.CLAD.42Z] with a diameter of 7mm.
Length: 24in/61cm