
Chapter4 ConnectingSignals
©NationalInstruments Corporation 4-29 ATE Series User Manual
Figure 4-11 showssign al connections for three typical DIO applications.
Figure4-11. DIOConnections
Figure 4-11 showsDIO<0..3> con figuredfor digital input and D IO<4..7>
configuredfor digital output. Digital input applications includ er eceiving
TTL signals and sensing externaldevice states such as the state of the
switch shownin the figure. Digital output applications incl ude sending
TTL signals andd rivingexternal devices such as the LED shown in the
figure.
Power ConnectionsTwo pins on the I/O connector supply +5 V from the PC power supply
usinga self-resetting fuse. The fuse resets automatically within a few
seconds after the overcurrent condition is removed. These pins are
referenced to DGND and can be used topower ex ternal digital circuitry.
The combined total power rating for both pins should be between +4.65
VDC to +5.25 VDC at 1 A.
DIO<4..7>
DIO<0..3>
+5V
LED
+5V
TTLSignal
Switch
I/OConnector
DGND