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© National Instruments Corporation 15 USB-6008/6009 User Guide and Specifications
Figure 12. Example of Connecting a Load
Caution
Exceeding the maximum input voltage ratings or maximum output ratings, which
are listed in the Specifications, can damage the DAQ device and the computer. National
Instruments is not liable for any damage resulting from such signal connections.
Source/Sink Information
The default configuration of the USB-6008/6009 DIO ports is open
collector, allowing 5 V operation, with an onboard 4.7 kΩ pull-up resistor.
An external, user-provided, pull-up resistor can be added to increase the
source current drive up to a 8.5 mA limit per line as shown in Figure 13.
The USB-6009 ports can also be configured as active drive using the
DAQmx API, allowing 3.3 V operation with a source/sink current limit of
± 8.5 mA. Refer to the NI-DAQmx Help for more information about how to
set the DIO configuration.
1 P0.0 configured as an open collector digital output driving a LED
2 P0.2 configured as a active drive digital output driving a 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