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PCI/PXI/PCIe-6509 User Guide and Specifications
Figure 5.
PCIe-6509 Digital I/O Circuitry
If you set the software to pull-down, the weak pull-down resistor in the NI ASIC pulls the DIO
line low. If you set the software to pull-up, the strong pull-up resistor pulls the DIO line high.
The pull setting takes effect regardless of the I/O direction, but the pull setting affects only the
state of the DIO lines that are configured for input.
To use MAX to configure the I/O pull resistor, select the device and click the
Properties
button.
Refer to the software documentation for information about how to program the pull setting using
NI-DAQmx with LabVIEW or other NI application development environments (ADEs).
Signal Connections
Figure 6 shows an example of signal connections for three typical digital I/O applications. Port 0
is configured for digital output, and port 7 is configured for digital input.
NI A
S
IC
Digit
a
l I/O Line
+5 V
GND
47 k
˖
,
typic
a
l
4.7 k
˖
, typic
a
l
S
oftw
a
re Controlled
I/O Protection
