NI 9426 Operating Instructions and Specifications
8
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Figure 2.
Connecting a Device to the NI 9426 (Three-Wire Device Shown)
The NI 9426 channel registers as ON when the sinking-o
u
tp
u
t
device drives the inp
u
t below V
s
u
p
and meets the inp
u
t ON range.
The channel registers as OFF when the device does not drive the
inp
u
t low and is in the inp
u
t OFF range. If no device is connected
to the DI pin, the channel registers as OFF. Refer to the
section for more information abo
u
t the ON and
OFF states.
NI 9426
+
_
DI
Vsup
Sinking-Output
Device
External
Power
Supply
