This article outlines BNC connections for video.

BNC connectors used coaxial cable with a specialized locking end connector, like the connections on an Oscilloscope. BNC was originally intended for military use and then pc manufacturers began using them on monitors back in the 80's and 90's. Once DVI was introduced as a Video connection, most monitor manufacturers stopped using them all-together (Elo being one of them). 

Elo hasn't supported BNC connections since 2001 .

If you require BNC connections for your system, Elo may be able to create a custom product for you. Please visit the Custom Products Page on the Elo website: https://www.elotouch.com/custom-products


See related article, RCA Connectors on Elo Monitors