Chapter 4
Connecting the Signals
©
National Instruments Corporation
4-23
Figure 4-13.
Digital I/O Connections
Power Connections
Two pins on the I/O connector 5 V from the computer power
supply through a self-resetting fuse. The fuse automatically resets within
a few seconds after the overcurrent condition is removed. These pins are
referenced to DGND, and you can use them to power external digital
circuitry. The fuse power rating is +4.65 to +5.25 VDC at 1 A.
Caution
Do
not
connect these +5 V power pins directly to analog or digital ground or to
any other voltage source on the device or any other device. Doing so can damage the device
and the computer. NI is
not
liable for damage resulting from such a connection.
LED
+5 V
TTL Signal
+5 V
DIO<4..7>
DIO<0..3>
DGND
Switch
I/O Connector
NI 6052E