Since late December the direct connection between the airport and its new train station is open. So far passengers had to take shuttle busses connecting the two terminals with the entrance to the station next to the car park. Now two new elevators have been taken into use that lead straight to the underground platforms. The elevators are located between terminal 1 and 2.
Shortly additional escalators will open as well, making the connection even more comfortable.
If you want to charge your HSL travel ticket before boarding the train, make sure to do that before going down to the platform though. Ticket machines downstairs so far only sell regular one-way tickets.