National Instruments NI PXI-7851 User Manual page 41

LED
5 V CMOS †
TTL, LVTTL, CMOS, or LVCMOS Signal
+5 V
© National Instruments Corporation
TTL or
+5 V
DGND
LVCMOS *
Compatible
Devices
Switch
I/O Connector
* 3.3 V CMOS
† Use a pull-up resistor when driving 5 V CMOS devices.
Figure 2-11. Example Digital I/O Connections
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.
Chapter 2
DGND
NI 783 x R/784 x R/785 x R
2-19
Hardware Overview of the NI 78xxR
DIO<4..7>
DIO<0..3>
R Series Intelligent DAQ User Manual