Cross Cancellation is a microprocessor controlled interface that links the new SWIFT Futura or Meridia controlled elevators to the existing dispatching system's hall call circuitry. Both the new and the old elevator systems "see" the call at the same time and either system is able to cancel the call.
This technique is also controlled via an on-board microprocessor. In this case, the SWIFT controller acts as the brain of the elevator system by first capturing the call and then analyzing it. If the call is best handled by the SWIFT controller, the microprocessor does not release the hall call to the legacy systems. However, if the call can be better handled by the older systems, the call will then be "released" into the system and will be handled normally.
This type of modernization utilizes the same advanced dispatching features as the full-version Futura or Meridia control systems. One microprocessor system is assigned per car to handle individual dispatching functions. The "overlay" controller communicates with the remote "intelligent" interface via the SWIFT Link high-speed bus. The I/O interface is based on the the Futura layout and the dispatch overlay adapts to most systems. This setup minimizes wiring to the existing selector and controller with a serial communications interface.