Salzburg to Berchtesgaden

I will be flying to Salzburg and wish to travel by bus or train to the
Berchtesgaden. Time will be short and I need to know if I can do this and
where to catch the bus or train for this trip.
I have Googled but have only been able to establish that the trip is
possible and not the times of the trains and buses and where to catch them.
The Deutsche Bahn web site expects the user to know which Salzburg Station
they will travel from (there are many) and I can not even find the bus
companies web site.
Can anyone who has already made this trip offer their advice?
Thank you.