National Instruments Data Acquisition Device E Series User Manual page 210

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User <1..2>
The User <1..2> signals connect directly from a screw terminal to a BNC.
They allow you to use a BNC connector for a digital or timing I/O signal of
your choice. The USER 1 BNC is internally connected to pin 21 and the
USER 2 BNC is internally connected to pin 22 on the 30-pin I/O connector.
Figure A-64 shows the connection of the User <1..2> BNCs.
User 1 BNC
User 2 BNC
D GND
Figure A-65 shows another example of how to use the User <1..2> BNCs.
To access the Ctr1Out signal from a BNC, connect pin 21 (USER 1) to
pin 17 (CTR 1 OUT) with a wire.
BNC Cable
Counter 1 Out
Signal
Figure A-65. User <1..2> BNC Example
Appendix A
30-Pin I/O Connector
D GND
Figure A-64. User <1..2> BNCs
User 1 BNC
Connector
Internal Connection
A-75
Device-Specific Information
Pin 21
Pin 22
Wire
E Series User Manual