©
National Instruments Corp.
9
NI 9425 Operating Instructions and Specifications
Figure 2.
Connecting a Device to the NI 9425 (Three-Wire Device Shown)
The NI 9425 channel registers as ON when the so
u
rcing-o
u
tp
u
t
device applies a voltage or drives a c
u
rrent that is in the inp
u
t ON
range to the DI pin. The channel registers as OFF when the device
applies a voltage or drives a c
u
rrent that is in the inp
u
t OFF range
to the DI pin. 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 9425
+
_
COM
DI
Sourcing-Output
Device
External
Power
Supply