© National Instruments Corporation
E-1
VXIpc-486 Model 500 Series
Appendix E
Modifying and Installing I/O Expansion
Boards
This appendix explains how to modify and install commercially available PC/XT and PC AT I/O
boards in a VXIpc-486/2 Model 500 Series computer equipped with the I/O expansion kit.
Some VXIpc-486/2 models are equipped with an expansion kit that accommodates installation of
either two PC/XT-height boards, or one PC/XT-height and one PC AT-height board. National
Instruments offers several plug-in expansion boards you can use. Please contact National
Instruments to find out what is currently available to expand your VXIpc-486.
When installing an I/O board, you must use a panel bracket, as shown in the reference drawing
following this page, with the appropriate additional cutouts necessary to accommodate the
connectors. The connector cutouts must fall within the shaded connector window shown in
the drawing. The connector window is compatible with the VXIpc-486/2 front panel cutouts, as
well as the connector window specified for 16-bit Industry Standard Architecture (ISA) bus I/O
boards.
Note:
In the drawing, all vertical dimensions are referenced to the bottom (connector) edge
of the printed wiring board (PWB). Horizontal dimensions are referenced to the top
(component) side of the PWB.
The panel should be manufactured according to the following specifications:
•
Material: .030
±
.003 1010 Cold Rolled Steel
•
Finish:
Bright Nickel Plate
Alternately, you can modify the blank panels provided with the VXIpc-486/2. Blank panels are
also available from National Instruments as an accessory (part number 181300-01). Custom
panel design services are available from National Instruments for a nominal fee.
The two holes in the bracket align with existing holes in the VXIpc-486 front panel. To affix the
panel bracket to the front panel, you can either install a PEM nut on the back (far) side of the
bracket, or use a 4-40 nut with lock washer. In either case, use a 4-40 x 1/4 in. stainless steel
panhead screw to mount the board/bracket assembly to the front panel. If you use a nut/lock
washer, notice that the hole diameter should be 0.125 in. Part number 181300-01 is provided
with PEM nuts installed.
To install your I/O board, replace the manufacturer-supplied panel bracket with the flat bracket.
Seat it firmly in one of the expansion bus connectors, and affix it to the front panel with the
two screws.
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