12-Pin Multi Connector to Lens Sync (IQ4)
The 12-pin Multi Connector is used on the IQ4 series to connect to external triggers such as the copal shutter on a technical camera.
Note that the XF and IQ4 both have 12-pin ports while the IQ3, IQ2, and IQ1 have 8-pin ports.
For more information please see this pdf.
Phase One Accessories