pxi back plane power

[pxi-syd]

HI there,

I have a PXI-1044 chassis loaded with varios NI cards, such as arbs, DIO's analogues and data aquasition cards.

I have also designed my own "Passive" PCB that just uses the supply rails on the cPCI P1 connector.

However I find that the -12V rail is not there on my own card.

Is there a power sequencer or device that turns off the rails to cards that doesnt tell the controller that it needs them ?

Can I frig this using MAX or put a wire link on the PCB connector to another pin to get the -12V line enabled ?

This is proving to be a real show stopper !

All other PXI Cards fitted to the rack function correctly !

Help please !

John

my real email address is jonathan.sage@baesystems.com

[Robert__R]

John,

-12V is supplied to the slots regardless of whether there's a card present or not.  If you're sure that you're looking at the right line, you may have a bad/damaged power supply or backplane.

You should probably check the voltage at the "Remote Inhibit and Voltage Monitoring" connector on the back of the chassis with a DMM.  The pinout is on page 2-9 of the detailed specifications.

- Robert