National Instruments USB-621 Series User Manual page 164

Appendix A Device-Specific Information
NI USB-621x User Manual
Refer to the Digital I/O on USB-6212/6216 Devices
Digital I/O, and the Connecting PFI Input Signals
PFI, for more information.
USER
The USER BNC connector allows you to use a BNC connector for a digital
or timing I/O signal of your choice. The USER BNC connector is routed
(internal to the USB-6212/6216 BNC) to the USER screw terminal, as
shown in Figure A-11.
Screw
Terminal
Block
Figure A-11. USER BNC Connection
Figure A-12 shows an example of how to use the USER BNC. To access
the PFI 8/P2.0 signal from a BNC, connect USER on the screw terminal
block to PFI 8/P2.0 with a wire.
D GND Wire
P0.0
P0.1
P0.2
P0.3
D GND
P0.4
P0.5
P0.6
P0.7
D GND
+5 V
D GND
Figure A-12. Connecting PFI 8/P2.0 to USER BNC
Internal
Connection
USER
Px.x
Px.x
Px.x
Px.x
Px.x
D GND
Internal
USER BNC
Connection
USER
PFI 8/P2.0
PFI 9/P2.1
D GND
PFI 10/P2.2
PFI 11/P2.3
D GND
PFI 12/P2.4
Screw
PFI 13/P2.5
Terminal
PFI 14/P2.6
Block
PFI 15/P2.7
D GND
AI GND
AI SENSE
A-18
section of Chapter 6,
section of Chapter 7,
USER BNC
D GND
BNC Cable
PFI 8
Signal
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