Definition of the first input on the landing bus, i.e.
depending on the number of landings there are
further inputs for landing calls on door side 1. The call
button is connected at the access number 1. If two
direction buttons (up/down) are installed, the up-
button is to be connected here. It thus follows that
IO2 belongs to the down-button.
Definition of the second input for landing calls, i.e.
depending on the number of landings there are
further inputs for landing calls on door side 1. This
defines the order of numbering.