A-10 | ni.com
Appendix A Module/Device-Specific Information
Note For a detailed description of each signal, refer to the I/O Connector Signal
Descriptions section of Chapter 3, Connector and LED Information.
Note For more information about default NI-DAQmx counter inputs, refer to
Connecting Counter Signals in the NI-DAQmx Help or the LabVIEW Help.
USB-6221 BNC Important Links
The following list contains links specific to your DAQ device:
• Specifications—Refer to the NI 6221 Specifications for more detailed information about
the USB-6221 BNC device.
• LED Patterns—Refer to the LED Patterns section of Chapter 3, Connector and LED
Information, for information about the USB-6221 BNC LEDs.
• Fuse Replacement—Refer to the USB Device Fuse Replacement section of Chapter 1,
Getting Started, for information about replacing the fuse on the USB-6221 BNC.
• Accessory Options—Refer to the USB Device Accessories, USB Cable, and Power Supply
section of Chapter 2, DAQ System Overview, for more information.
Table A-4. Default NI-DAQmx Counter/Timer Pins
Counter/Timer Signal Default Pin Name
CTR 0 SRC PFI 8
CTR 0 GATE PFI 9
CTR 0 AUX PFI 10
CTR 0 OUT PFI 12
CTR 0 A PFI 8
CTR 0 Z PFI 9
CTR 0 B PFI 10
CTR 1 SRC PFI 3
CTR 1 GATE PFI 4
CTR 1 AUX PFI 11
CTR 1 OUT PFI 13
CTR 1 A PFI 3
CTR 1 Z PFI 4
CTR 1 B PFI 11
FREQ OUT PFI 14
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