Topic: Command to check / set actual data rate being used?

I am using a SCL-3711USB dongle to read a TI RF430 passive tag.

The tag is capable of running at 874kbps and by making the appropriate settings reports this capability when the SCL-3711 detects the tag (via libnfc).

How do I know what rate is actually being used to transfer data? Is this something I need to set manually or does the SCL-3711 automatically select the highest rate reported?