National Instruments USB-621 Series User Manual page 169

Note For more information about default NI-DAQmx counter inputs, refer to Connecting
Counter Signals in the NI-DAQmx Help or the LabVIEW Help in version 8.0 or later.
Connecting Signals to the USB-6218 BNC
© National Instruments Corporation
Table A-7. Default NI-DAQmx Counter/Timer Pins
Counter/Timer Signal
CTR 0 SRC
CTR 0 GATE
CTR 0 AUX
CTR 0 OUT
CTR 0 A
CTR 0 Z
CTR 0 B
CTR 1 SRC
CTR 1 GATE
CTR 1 AUX
CTR 1 OUT
CTR 1 A
CTR 1 Z
CTR 1 B
FREQ OUT
Analog Input
You can use each analog input BNC connector for one signal in differential
mode or two signals in single-ended mode:
• Differential Mode—To connect signals in differential mode,
determine the type of signal source you are using—a floating signal
(FS) source or a ground-referenced signal (GS) source. Refer to the
Connecting Analog Input Signals on USB-6215/6216/6218 Devices
section of Chapter 4,
To measure a floating signal source, move the switch to the FS
position. To measure a ground-referenced signal source, move the
switch to the GS position. Figure A-15 shows the AI 0 BNC and
corresponding FS/GS switch on the top panel of the USB-6218 BNC.
Appendix A
Analog Input, for more information.
A-23
Device-Specific Information
Default Terminal Name
PFI 0
PFI 1
PFI 9
PFI 4
PFI 0
PFI 1
PFI 9
PFI 3
PFI 2
PFI 10
PFI 5
PFI 3
PFI 2
PFI 10
PFI 6
NI USB-621x User Manual