National Instruments DAQPad-6508 User Manual page 60

Appendix C Common Questions
Digital I/O
DAQPad-6507/6508 User Manual
What does the blink pattern mean for the configuration LED on the
front panel?
This LED blinks to indicate the status of the DAQPad-6507/6508 devices.
It also can indicate an error through a blink code. Refer to Table 2-1 for
more information.
What are the power-on states of the PPI and DIO lines on the I/O
connector?
At system power-on and reset, both the PPI and DIO lines are set to high
impedance by the hardware. This means that the device circuitry is not
actively driving the output either high or low. However, these lines may
have pull-up or pull-down resistors connected to them as shown in the
Digital I/O State Selection
resistors weakly pull the output to either a logic high or logic low state.
section in Chapter 3,
C-2
Signal Connections. These
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