National Instruments NI 783xR Manuel D’Utilisation

© National Instruments Corporation

 

Figure 2-10.  Example Digital I/O Connections

Figure 2-10 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 2-10. Digital output 
applications include sending TTL or LVCMOS signals and driving external 
devices, such as the LED shown in Figure 2-10.

The NI 783xR SH68-C68-S shielded cable contains 34 twisted pairs of 
conductors. To maximize the digital I/O available on the NI 783xR, some 
of the DIO lines are twisted with power or ground and some DIO lines are 
twisted with other DIO lines. To obtain maximum signal integrity, place 
edge-sensitive or high-frequency digital signals on the DIO lines that are 
paired with power or ground. Because the DIO lines that are twisted with 
other DIO lines can couple noise onto each other, use these lines for static 

*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

DIO<0..3>

DIO<4..7>

+5 V

5 V CMOS

†

TTL or 
LVCMOS*

 

Compatible
Devices

DGND