How to choose logic family for reference clock?

I need my NI device (PCIe-6363) to lock onto an external 10 MHz signal. I understand I can do this via the RefClkSrc/RefClkRate properties of the relevant tasks. I got that to work well enough.

How can I select the logic family for the clock source terminal? AFAICT, DAQmxSetDILogicFamily is not the right way to go. I do not want to select the family for a given channel. The reference clock is not a channel property, it is a task property.

Thanks for any hints.
Pol