In a fire control system for an elevator, the time for the fire and smoke to reach the elevator hall of each floor of a building during fire is pre-calculated as the evacuation time of the floor. A tilting bed round bale unloader deposits bales one tier at a time onto their cylindrical surfaces on the ground. The first surface reflects a central field-angle principal ray, which comes from the second surface and is again incident on the first surface, to the opposite side of the previous reflection with respect to a normal at a hit point of the central field-angle principal ray on the first surface. The received IP packet-switching signals are converted by a hardware-based protocol converter into asynchronous serial control and data signals compatible with the remote device.