The Otis Elevonic 101 was a traction elevator system introduced by Otis in 1979.


It was the first elevator control system that was fully microprocessor controlled and used silicon-controlled rectifier motor drives. The Otis Elevonic 101 was later succeded by the Otis Elevonic 401. It is unknown if both were made at the same time for a certain period, but this is possible. It was discontinued around 1981. It can be hard to tell apart from a relay logic Otis traction elevator, but if the indicator numbers change very quickly, it might be an Elevonic 101.

Otis Elevonic 101 has the ability to match elevator speed, position and direction to building's traffic flow. It no longer follows a single pre-programmed course by increasing the exchange information between three microprocessor controllers:

  • Car controllers: Located in the elevator machine room, it dictates acceleration, position and direction for each cabs.
  • Group controllers: This controller is connected directly to the car controllers for a multicar system, and makes car-assigments decisions.
  • Cab controller: Located on each elevator cars, this unique controller sends back information about passenger load, car calls and door position.

The cab controller communicates from the car in the shaft back to the controller along one cable containing 50 wires. The constant flow of information between the cab controller and car and group controllers enables the system to respond to immediate changes in traffic flow. For example, if a fully loaded car is detected by the cab controller and sends the information to the central controller, the central controller will direct the elevator to go straight to the lobby without responding to hall calls.

Elevonic 101 was also claimed to reduce waiting time, travel time as well as energy usage. In energy saving, the system was claimed to reduced energy by 30% by shutting down the power in the motor drive when the elevator is not in use.


Although exact specs are unknown, these are the options known to exist.

  • Center open doors
  • The Halo fixtures (older/newer)
  • 3500 lbs. capacity
  • Can serve up to 51+ floors. Minimum floor limit is unlikely, but can serve 7- floors.
  • 350/500/700/800/1200 FPM speeds.
  • Rear door existence not known, but it most likely exists.

Notable installations

  • Hilton Lincoln Center, Dallas, TX
  • Thanksgiving Tower, Dallas, TX (since modernized)
  • 101 Park Avenue, New York, NY


Awesome Otis Lexan High Speed elevator @ Thanksgiving Tower Dallas TX

Awesome Otis Lexan High Speed elevator @ Thanksgiving Tower Dallas TX

Otis Elevonic 101 high rise traction elevators at Thanksgiving Tower, Dallas, TX

Schindler lifts (Dewhurst fixtures 2) "This elevator only serves two floors."
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