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Appendix A
Device-Specific Information
©
National Instruments Corporation
A-23
Note
For more information abo
u
t defa
u
lt NI-DAQmx co
u
nter inp
u
ts, 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
Analog Input
Yo
u
can
u
se each analog inp
u
t 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 so
u
rce yo
u
are
u
sing—a floating signal
(FS) so
u
rce or a gro
u
nd-referenced signal (GS) so
u
rce. Refer to the
Connecting Analog Input Signals on USB-6215/6216/6218 Devices
section of Chapter 4,
, for more information.
To meas
u
re a floating signal so
u
rce, move the switch to the FS
position. To meas
u
re a gro
u
nd-referenced signal so
u
rce, move the
switch to the GS position. Fig
u
re A-15 shows the AI 0 BNC and
corresponding FS/GS switch on the top panel of the USB-6218 BNC.
Table A-7.
Default NI-DAQmx Counter/Timer Pins
Counter/Timer Signal
Default Terminal Name
CTR 0 SRC
PFI 0
CTR 0 GATE
PFI 1
CTR 0 AUX
PFI 9
CTR 0 OUT
PFI 4
CTR 0 A
PFI 0
CTR 0 Z
PFI 1
CTR 0 B
PFI 9
CTR 1 SRC
PFI 3
CTR 1 GATE
PFI 2
CTR 1 AUX
PFI 10
CTR 1 OUT
PFI 5
CTR 1 A
PFI 3
CTR 1 Z
PFI 2
CTR 1 B
PFI 10
FREQ OUT
PFI 6