General-Purpose Digital I/O - National Instruments NI PCIe-8255R User Manual

If possible, camera power should be provided through the ATX connector inside the
Note
computer. If you cannot supply camera power through the ATX connector, camera power
is supplied by the PCI Express bus and should be limited to 3 W, shared by both ports.

General-Purpose Digital I/O

The accessories available for use with the NI 8255R do not provide access to all
Note
available I/O on the NI 8255R device. To access this I/O, you can create a custom cable
using a standard male 44-pin D-SUB connector.
Note Isolated inputs are compatible with 5 V logic if the external circuit meets the voltage
and current requirements listed in the Specifications section of Getting Started with the
NI PCIe-8255R.
Caution Do not draw more than 100 mA from 24 V or 30 V isolated outputs. Do not draw
more than 50 mA from 5 V isolated outputs.
© National Instruments Corporation
The 44-pin D-SUB connector provides access to the general-purpose
digital inputs and outputs and the isolated power supply. The
general-purpose digital I/O available on this connector includes 2 TTL
inputs, 10 TTL outputs, 13 isolated inputs, and 4 isolated outputs. In
addition to I/O, the 44-pin D-SUB connector provides access to V
C for powering the isolated outputs with an external power supply. The
iso
orange LED on the front panel of the NI 8255R illuminates when power for
the isolated outputs is present. For easy connection to the digital I/O
connector, use the National Instruments digital I/O cable and the NI Vision
I/O Terminal Block and Prototyping Accessory.
For more information about the National Instruments digital I/O cable
and terminal blocks, refer to the Optional Equipment section of Getting
Started with the NI PCIe-8255R.
3-3
Chapter 3 Signal Connections
and
iso
NI PCIe-8255R User Manual