Can NI PXI chassis support 3.3V PCI signals?

[systemtrace]

We are interested in getting a National Instruments PXI chassis (PXI-1042) for our system.  However, we have PXI modules which are only compatible with 3.3V PCI signalling.  Can this chassis be configured for 3.3V PCI signalling (on the V(I/O) pins) or is it 5V only?

Is there a way for us to configure this? (i.e. a jumper, or switch somewhere on the chassis)  Every other PXI chassis manufacturer I've looked in to have a way for the user to set this, but I have not been able to find any information on this for NI chassis.

[Roland A.]

Hello systemtrace:

Our chassis can supply 3.3 V or 5V across the backplane. Our chassis are not keyed for 5V only. Therefore, you can use your 3.3V card in our chassis, but you cannot use a 5V card at the same time. I hope this information helps.

[Roland A.]

Hello systemtrace:

I apologize, my previous post was incorrect. The 1042 and 1045 chassis are both keyed for 5V-only VIO, and the VIO pins are tied to +5V. Again, I apologize for the mis-information.