National Instruments NI 9426, Руководство по началу работы

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Connecting a Sinking-Output Device
You can connect 2- and 3-wire sinking-output devices to the
NI 9426.
Figure 1. Connecting a Sinking-Output Device to the NI 9426
NI 9426
+
_
DI
Vsup
Sinking-Output
Device
External
Power
Supply
The NI 9426 channel registers as ON when the sinking-output
device drives the input below Vsup and meets the input ON
range. If no device is connected to DI, the channel registers as
OFF.
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