User manual

Chapter 3 Signal Connections
PC-DIO-96/PnP User Manual 3-8 © National Instruments Corporation
Figure 3-4. Digital I/O Connections
In Figure 3-4, PPI A, port A is configured for digital output, and PPI C,
port B is configured for digital input. Digital input applications include
receiving TTL signals and sensing external device states such as the
state of the switch in Figure 3-4. Digital output applications include
sending TTL signals and driving external devices such as the LED
shown in Figure 3-4.
* Complex switch circuitry is not shown in order to simplify the figure.
PC-DIO-96/PnP
Switch *
I/O Connector
+5 V
+5 V
LED
TTL Signal
41
43
45
47
67
71
73
69
50, 100
+5 V
Jumper
Selectable (W1)
100 kΩ 100 kΩ 100 kΩ 100 kΩ
100 kΩ100 kΩ 100 kΩ 100 kΩ
PPI C
Port B 
CPB<7..4>
PPI A
Port A
APA<3..0>
GND