Chapter 2
Hardware Overview of the NI 78xxR
©
National Instruments Corporation
2-19
R Series Multifunction RIO User Manual
Figure 2-11.
Example Digital I/O Connections
Fig
u
re 2-11 shows DIO<0..3> config
u
red for digital inp
u
t and DIO<4..7>
config
u
red for digital o
u
tp
u
t. Digital inp
u
t applications incl
u
de receiving
TTL, LVTTL, CMOS, or LVCMOS signals and sensing external device
states, s
u
ch as the state of the switch shown in Fig
u
re 2-11. Digital o
u
tp
u
t
applications incl
u
de sending TTL or LVCMOS signals and driving external
devices, s
u
ch as the LED shown in Fig
u
re 2-11.
The NI 78
xx
R SHC68-68-RDIO cable contains individ
u
ally shielded
b
u
ndles that ro
u
te each digital signal on an individ
u
ally shielded pair of
wires, and each signal is twisted with its own wire to digital gro
u
nd.
*3.3 V CMOS
†
Use a pull-up resistor when driving 5 V CMOS devices.
LED
TTL, LVTTL, CMOS, or LVCMOS Signal
+5 V
Switch
I/O Connector
DGND
NI 783
x
R/784
x
R/785
x
R
DIO<0..3>
DIO<4..7>
+5 V
5 V CMOS
†
TTL or
LVCMOS*
Compatible
Devices
DGND
Summary of Contents for PXI-7842
Page 1: ...PXI 7842...
