NI 9411 Operating Instructions and Specifications 8 ni.com
measures whether the difference between the DIa and DIb pins is
greater than or less than the digital logic levels. If the difference
between the pins is within the input high range, the channel
registers as high. If the difference between the pins is within the
input low range, the channel registers as low. Refer to the
Specifications section for more information about digital logic
levels. Figure 2 shows a possible configuration.
Figure 2. Connecting a Differential Device to the NI 9411
COM
V
sup COM
NI 9411
+
–
DIa
+5 V
out
DIb
–+
Differential
Device
External
Power Supply
+5 V
Reg
Receiver
Circuitry
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