National Instruments NI USB-621x manual 172

Index

Declaration of Conformity (NI resources), C-1default

counter terminals, 9-29NI-DAQmx counter/timer pins, 9-29 pins, 9-29

device information, A-1 pinouts, 1-3 specifications, 1-3,A-1USB-6210,A-1USB-6211,A-4USB-6215,A-4USB-6218,A-7

diagnostic tools (NI resources), C-1DIFF connections

using with floating signal sources, 5-5 using with ground-referenced signal

sources, 5-12

when to use with floating signal sources, 5-3

when to use with ground-referenced signal sources, 5-10

differential analog input, troubleshooting, B-1differential connections

using with floating signal sources, 5-5 using with ground-referenced signal

sources, 5-12

when to use with floating signal sources, 5-3

when to use with ground-referenced signal sources, 5-10

digital isolation, 11-2 isolators, 11-1

digital I/O, 8-1

block diagram, 8-1 circuitry, 8-1 connecting signals, 8-3

getting started with applications in software, 8-4

I/O protection, 8-2

static DIO, 8-2 triggering, 14-1 digital routing, 12-1

digital signals connecting, 8-3

digital source, triggering, 14-1documentation

conventions used in manual, xiii NI resources, C-1

related documentation, xiv double-buffered acquisition, 4-10 drivers (NI resources), C-1 duplicate count prevention, 9-35

enabling in NI-DAQmx,9-38 example, 9-36

prevention example, 9-37

E

edge counting, 9-2 buffered, 9-3

non-cumulative buffered, 9-4on-demand,9-2

sample clock, 9-3 single point, 9-2

edge-separation measurement buffered two-signal,9-19 single two-signal,9-18

enabling duplicate count prevention in NI-DAQmx,9-38

encoders, quadrature, 9-15encoding

X1, 9-15

X2, 9-16

X4, 9-16

equivalent time sampling, 9-24 examples (NI resources), C-1 exporting timing output signals using PFI

terminals, 10-3

NI USB-621x User Manual I-4 ni.com