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© National Instruments Corp. 9 NI 9401 Operating Instructions and Specifications
Figure 3 illustrates how to connect several types of digital devices
to the NI 9401.
Figure 3. Connecting Digital Devices to the NI 9401
TTL Signal
+5 V
+5 V
LED
DIO0 as Input
DIO1 as Input
COM
DIO7 as Output
NI 9401
Dev 3
Dev 2
Dev 1