National Instruments USB-6008/6009 Manual De Usuario
© 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
, 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 k
collector, allowing 5 V operation, with an onboard 4.7 k
Ω 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.
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.
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
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
+5 V
LED
1
2
3
4
TTL Signal