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26 SBC329 3U VPX Single Board Computer
Publication No. SBC329-HRM/1
4.2 Board Keying
The keying pins are used to define slot-specific keying. The SBC329 is delivered with
module keying devices of the unkeyed type to allow the board to be fitted to any
backplane slot.
Contact Abaco to discuss any specific keying requirements.
4.3 Board Installation Notes
1.
The VPX specification allows for a variety of different backplane pinouts
depending on the mix of differential and single ended connectors. Ensure that
the pinout of the SBC329 matches that of the backplane slot before insertion.
2.
Air-cooled versions of the SBC329 have an injector/ejector handle to ensure that
the backplane connectors mate properly with the backplane. The captive screws
at the top and bottom of the front panel allow the board to be tightly secured in
position, which provides continuity with the chassis ground of the system.
3.
Conduction-cooled versions of the SBC329 have screw-driven wedgelocks to
provide the necessary mechanical/thermal interface. Correct adjustment requires
a calibrated torque wrench with a hexagonal head of size
3
/
32
”, set to 0.7 Nm
(6 in-lb).
4.
In an air-cooled development enclosure, when taking I/O connections from the
backplane connectors, use of Abaco I/O modules (or some equivalent system)
ensures optimum operation of the SBC329 regarding EMI. See the VPX I/O
Modules manual for more details.
LINK
VPX I/O Modules Hardware Reference Manual, publication number VPXIOM-0HH.