Chapter 8
Counters
©
National Instruments Corporation
8-29
Routing Signals to Counter
n
HW Arm Input
Any of the following signals can be ro
u
ted to the Co
u
nter
n
HW Arm inp
u
t:
•
(USB-6210/6211/6215 Devices)
PFI <0..3>
•
(USB-6212/6216 Devices)
PFI <0..15>
•
(USB-6218 Devices)
PFI <0..3>, PFI <8..11>
•
AI Reference Trigger (ai/ReferenceTrigger)
•
AI Start Trigger (ai/StartTrigger)
Co
u
nter 1 Internal O
u
tp
u
t can be ro
u
ted to Co
u
nter 0 HW Arm. Co
u
nter 0
Internal O
u
tp
u
t can be ro
u
ted to Co
u
nter 1 HW Arm.
Some of these options may not be available in some driver software.
Counter
n
Internal Output and Counter
n
TC Signals
The Co
u
nter
n
Internal O
u
tp
u
t signal changes in response to Co
u
nter
n
TC.
The two software-selectable o
u
tp
u
t options are p
u
lse o
u
tp
u
t on TC and
toggle o
u
tp
u
t on TC. The o
u
tp
u
t polarity is software-selectable for both
options.
With p
u
lse or p
u
lse train generation tasks, the co
u
nter drives the p
u
lse(s) on
the Co
u
nter
n
Internal O
u
tp
u
t signal. The Co
u
nter
n
Internal O
u
tp
u
t signal
can be internally ro
u
ted to be a co
u
nter/timer inp
u
t or an “external” so
u
rce
for AI, AO, DI, or DO timing signals.
Routing Counter
n
Internal Output to an Output
Terminal
Yo
u
can ro
u
te Co
u
nter
n
Internal O
u
tp
u
t to any o
u
tp
u
t PFI terminal.
Frequency Output Signal
The Freq
u
ency O
u
tp
u
t (FREQ OUT) signal is the o
u
tp
u
t of the freq
u
ency
o
u
tp
u
t generator.
Routing Frequency Output to a Terminal
Yo
u
can ro
u
te Freq
u
ency O
u
tp
u
t to any o
u
tp
u
t PFI terminal.
