© National Instruments Corporation 17 NI USB-6008/6009 User Guide and Specifications
Digital I/O
The NI USB-6008/6009 has 12 digital lines on two ports, Port 0 has eight lines, P0.<0..7>, and Port 1
has four lines, P1.<0..3>. GND is the ground-reference signal for the digital I/O ports. You can
individually program all lines as inputs or outputs.
Figure 14 shows P0.<0..7> connected to example signals configured as digital inputs and digital outputs.
You can configure P1.<0..3> similarly.
Figure 14. Example of Connecting a Load
Caution Exceeding the maximum input voltage ratings or maximum output ratings, which are listed
in the Specifications section, can damage the device and the computer. National Instruments is not
liable for any damage resulting from such signal connections.
1 P0.0 configured as an open collector digital output driving an LED
2 P0.2 configured as an active drive digital output driving an LED
3 P0.4 configured as a digital input receiving a TTL signal from a gated invertor
4 P0.7 configured as a digital input receiving a 0 V or 5 V signal from a switch
+5 V
LED
Switch
I/O Connector
GND
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
+5 V
LED
1
2
3
4
TTL Signal
NI USB-6008/6009
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