TTL interfacing to 6514

I have a PXI-6514 and would like to know if it can act as a direct TTL input card with no external power supply.  The user guide doesn't really make it clear if this is a supported configuration.

I'm trying to use the 6514 to detect edges (To time stamp them for latency measurement).  I don't need to timestamp at much better than a few hundred microseconds and I'm using a PXIe LabView RealTime chassis.

Thanks,

XL600