An elevator system in a building having a plurality of levels, the system having elevator cars, a controller operationally coupled to the elevator cars, and configured to receive a service request, and render a first determination to select one of the elevator cars to respond to the service request, wherein the controller is configured to render the first determination from a determination of one or more of an elevator health and usage state of the elevator cars, and a travel time to respond to the service request by each of the elevator cars.

An elevator system in a building having a plurality of levels, the system having elevator cars, a controller operationally coupled to the elevator cars, and configured to receive a service request, and render a first determination to select one of the elevator cars to respond to the service request, wherein the controller is configured to render the first determination from a determination of one or more of an elevator health and usage state of the elevator cars, and a travel time to respond to the service request by each of the elevator cars.

A method and a data network for communicating data content, particularly useful in an elevator system, includes a master unit and a plurality of slave units that are connected to one another via data communication paths to exchange data telegrams having a large number of bits between one another. The master unit and the slave units are connected in series to form a chain via the data communication paths wherein a data telegram is transmitted from the master unit to a last slave unit on an outward data path. The last slave unit initiates a data return path by returning the data telegram to the master unit. The data telegram is modified by the slave units exclusively during the data return path and at least one slave unit begins to compile information requested by the master unit immediately after receiving and evaluating the data telegram.