NI USB 6221 Counting

Hey everyone,

So we are looking to get an NI USB 6221 for a project. The idea is that we want to use it to read the data coming out of a photon counter (in the form of TTL signals), at a rate of 10mHz. We have tried using the USB 6008 but have realized that it has no timing capabilities, and can not use an external clock.

So our hopes are that the USB 6221 will be able to read the data out of the photon counter with and without an external clock. Is this reasonable? I have looked at the data sheet but would just like to confirm that it can actually do what we want it to do first.

Thanks!