Working on a 6010. In the up direction from bottom floor only give it a call the car will answer the floor above the desired floor. “S” signals are coming in properly 2S, 3S, 4S etc.

In a down direction call from the top floor the car will initiate a 1sd signal early which drops HS & run in leveling all the way until the desired floor is reached. “S”s all unlatch at the proper sequence.

What signal tells the controller it’s at the bottom floor, usually it’s a down normal signal, but on these cars that doesn’t appear to be the case.