Figure 4-5. Digital I/O Connections - National Instruments DAQ PCI-4451 User Manual

LED
+5 V
© National Instruments Corporation
Figure 4-5 shows signal connections for three typical digital I/O
applications.
+5 V
TTL Signal
Switch
I/O Connector

Figure 4-5. Digital I/O Connections

Figure 4-5 shows DIO<0..3> configured for digital input and DIO<4..7>
configured for digital output. Digital input applications include receiving
TTL signals and sensing external device states such as the state of the
switch shown in Figure 4-5. Digital output applications include sending
TTL signals and driving external devices such as the LED shown in
Figure 4-5.
DGND
4-13
Chapter 4 Signal Connections
DIO<4..7>
DIO<0..3>
PCI-4451/4452 User Manual