How can I echo a Chronos key press on the I/O Expansion connector?

I want to mark the onset of a key press on an EEG. When a participant presses a key on Chronos:

• Is there a way to produce an output automatically on the I/O Expansion connector? if so, how?

• If it’s not possible and one must use E-Prime, what is the time delay and jitter? is there a support doc that shows how to do that?

Thank you in advance.