National Instruments USB-621 Series, User Manual

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Appendix A Device-Specific Information
© National Instruments Corporation A-17 NI USB-621x User Manual
When yo u set the so u rce type to the GS position and config u re the
device for single-ended inp u t in software, each BNC connector
provides access to two single-ended channels, AI x and AI x +8. For
example, the BNC connector labeled AI 0 provides access to
single-ended channels AI 0 and AI 8, the BNC connector labeled AI 1
provides access to single-ended channels AI 1 and AI 9, and so on.
Up to 16 single-ended channels are available in single-ended
meas
u rement modes.
For information on how to connect yo u r signals in single-ended mode,
AI GND, and/or AI SENSE, refer to the
Connecting Analog Input
Signals on USB-6210/6211/6212 Devices
or
Connecting Analog Input
Signals on USB-6215/6216/6218 Devices
section of Chapter 4,
Analog Input . For a detailed description of each signal, refer to the
I/O Connector Signal Descriptions section of Chapter 3, Connector
and LED Information .
Analog Output
Yo u can access analog o u tp u t signals on the BNC connectors labeled AO 0
and AO 1. Fig u re A-9 shows the analog o u tp u t circ u itry on the
USB-6212/6216 BNC.
Figure A-9. Analog Output Circuitry
Refer to the Connecting Analog Output Signals section of Chapter 5,
Analog Output , for more information.
Digital I/O and Timing I/O
Yo u can access digital I/O and timing I/O signals on the BNC connectors
labeled PFI <0..7>/P1.<0..7>. Fig u re A-10 shows the DIO/TIO circ u itry on
the USB-6212/6216 BNC.
Figure A-10. Digital I/O and Timing I/O Circuitry
AO x
AO GND
PFI x /P1. x
D GND