I am designing a manufacturing test system. I simply need the PC mounted connectors to match those used on these boards so that I may use 1:1 cables for the interconnection.
There is actually a Knowledge Base that talks about PCB Mounting Connectors for Boards and also for Cables. You can take a look at it if you go to ni.com and then make a search for "board mating connectors".
As you will see in that KB, the one used for E-Series Boards is the 68-Pos Inverted Right Angle PWB-Mount Connector (Male), with Part Number 760999-01.