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©
National Instruments Corp.
7
NI 9476 Operating Instructions and Specifications
Each channel has a DO pin to which yo
u
can connect a digital inp
u
t
device. The 32 digital o
u
tp
u
t channels are internally referenced to
COM.
Yo
u
m
u
st connect an external power s
u
pply to the NI 9476. The
power s
u
pply provides the c
u
rrent for the o
u
tp
u
t channels. Connect
the positive lead of the power s
u
pply to the s
u
pply pin, V
s
u
p
, and
the negative lead of the power s
u
pply to the common pin, COM.
Refer to the
section for information abo
u
t the power
s
u
pply voltage range.
Note
The V
s
u
p
pins are internally connected. Yo
u
can
connect only one external voltage s
u
pply to the device.
Caution
Do
not
remove or insert mod
u
les if the external
power s
u
pply connected to the V
s
u
p
and COM pins is
powered on.
The NI 9476 has c
u
rrent so
u
rcing o
u
tp
u
ts, meaning the DO pin is
driven to V
s
u
p
when the channel is t
u
rned on.