Chapter 4
Connecting the Signals
4-22
ni.com
Connecting Digital I/O Signals
The DIO signals are DIO<0..7> and DGND. DIO<0..7> are the signals
making up the DIO port, and DGND is the ground reference signal for the
DIO port. You can individually program all lines as inputs or outputs.
Caution
Exceeding the maximum input voltage ratings listed in Table 4-3 can damage the
device and the computer. NI is
not
liable for any damage resulting from such signal
connections.
Figure 4-13 shows signal connections for three typical DIO applications.
Figure 4-13 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 the figure. Digital output applications include sending
TTL signals and driving external devices, such as the LED shown in
the figure.
