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Chapter 4 Signal Connections
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National Instruments Corporation 4-13 PCI-4451/4452 User Manual
Figure 4-5 shows signal connections for three typical digital I/O
applications.
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.
LED
+5 V
TTL Signal
+5 V
DIO<4..7>
DIO<0..3>
DGND
Switch
I/O Connector
User.book Page 13 Tuesday, April 14, 1998 10:20 AM