National Instruments E Series - Digital I;O Signal Connections; Figure 4-8. Digital I;O Connections

Chapter 4 Signal Connections
 National Instruments Corporation 4-21 DAQCard E Series User Manual
Digital I/O Signal Connections
The digital I/O signals are DIO<0..7> and DGND. The DIO<0..7>
signals make up the DIO port, and DGND is the ground reference
signal for this port. You can program all lines individually to be inputs
or outputs.
Warning: Exceeding the maximum input voltage ratings, which are listed in
Tables 4-2 through 4-3, can damage the DAQCard and the computer.
National Instruments is NOT liable for any damages resulting from such
signal connections.
Figure 4-8 shows signal connections for three typical digital
I/O applications.
Figure 4-8. Digital I/O Connections
LED
+5 V
TTL Signal
+5 V
DIO<4..7>
DIO<0..3>
DGND
Switch
I/O Connector
E Series Card