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LED
DGND
5 V CMOS †
TTL, LVTTL, CMOS, or LVCMOS Signal
+5 V
Switch
* 3.3 V CMOS
†
Use a pull-up resistor when driving 5 V CMOS devices.
Figure 2-11 shows DIO<0..3> configured for digital input and DIO<4..7>
configured for digital output. Digital input applications include receiving
TTL, LVTTL, CMOS, or LVCMOS signals and sensing external device
states, such as the state of the switch shown in Figure 2-11. Digital output
applications include sending TTL or LVCMOS signals and driving external
devices, such as the LED shown in Figure 2-11.
The NI 78xxR SHC68-68-RDIO cable contains individually shielded
bundles that route each digital signal on an individually shielded pair of
wires, and each signal is twisted with its own wire to digital ground.
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TTL or
+5 V
LVCMOS *
Compatible
Devices
I/O Connector
Figure 2-11. Example Digital I/O Connections
2-19
Chapter 2
Hardware Overview of the NI 78xxR
DIO<4..7>
DIO<0..3>
DGND
NI 783xR/784xR/785xR
R Series Multifunction RIO User Manual
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