Figure 4.
Connecting Digital Devices to the NI 9401
+5 V
+5 V
DIO1
COM
DIO7
NI 9401
LED
Switch
DIO0
TTL Signal
DIO3:0
Configured
for Input
DIO7:4
Configured
for Output
Overcurrent/Short-Circuit Protection
The overcurrent protection allows only a specified amount of
current through the output channels to protect the NI 9401 from
short circuits. If the NI 9401 goes into an overcurrent state, the
NI 9401 Getting Started Guide
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© National Instruments
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15
