National Instruments Data Acquisition Device E Series - Manual (Page 211)

Appendix A Device-Specific Information
E Series User Manual A-76 ni.com
Other Signals
You can access other signals on BNC DAQPads through a 30-pin
Combicon connector.
To connect to one of these signals, use a small screwdriver to press down
the orange spring release button at a terminal and insert a wire. Releasing
the orange spring release button will lock the wire securely in place.
You can remove the Combicon plugs to assist in connecting wires.
Loosening the screws on either side of the two Combicon plugs allows you
to detach the Combicon plugs from the BNC DAQPad device, as shown in
Figure A-66
Figure A-66. Removing the BNC Combicon