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National Instruments Corporation
6-1
6
Digital Input and Output
NI 6232/6233 devices have six static digital input lines, P0.<0..5>. These
lines also can be used as PFI inputs.
The voltage input and output levels and the current drive level of the DI and
DO lines are listed in the
NI 6232/6233 Specifications
, for more information on PFI inputs and outputs.
I/O Protection
Each DI, DO, and PFI signal is protected against ESD events on
NI 6232/6233 devices. Consult the device specifications for details.
However, you should avoid these fault conditions by following these
guidelines.
•
Do
not
connect any digital output line to any external signal source,
ground signal, or power supply.
•
Understand the current requirements of the load connected to the
digital output lines. Do
not
exceed the specified current output limits
of the digital outputs. NI has several signal conditioning solutions for
digital applications requiring high current drive.
•
Do
not
drive the digital input lines with voltages or current outside of
its normal operating range.
•
Treat the DAQ device as you would treat any static sensitive device.
Always
properly ground yourself and the equipment when handling the
DAQ device or connecting to it.
Programmable Power-Up States
By default, the digital output lines (P1.<0..3>/PFI <6..9>) are set to 0. They
can be programmed to power up as 0 or 1.
Refer to the
NI-DAQmx Help
or the
LabVIEW 8.x Help
for more
information about setting power-up states in NI-DAQmx or MAX.
