Page 15 of 102
TVL 351
ISSUE 15
4.3. Group Operation
Press: Settings → Search Settings → Group or Parking or Peaks
The Ethos Two can be configured as a simplex or dispatcher-less group with up to 8 cars. The system can also be
setup with a standalone dispatcher or HCD dispatcher (Navigator) system. Various settings for group operation are
listed below:
Dispatching Overview (Non – HCD)
Put simply the dispatching algorithm employed by Ethos Two aims to assign the oldest call to the best car. Special
processing routines bias the assignment of calls to close cars or cars with coincident car and landing calls. The net
result is a balance between the fair distribution of lift service to all floors and an intuitive assignment of cars.
Installers may adjust call preference and parking assignments for normal, up and down peak traffic. Additional
priority can be given to calls at the main floor during an up peak and a Lobby Car feature may be used to keep a
single car at the lobby for an extended period.
Dispatching functionality may be provided by a per car controller (dispatcher-less operation) or by a standalone
dispatcher. Conceptually Ethos Two uses a master / slave dispatching model where the dispatch master assigns
landing calls to all controllers in the group. The dispatch master / slave concept is applied to installations large or
small. A simplex controller is always a dispatch master, a duplex installation has one dispatch master and one
slave, a triplex installation has one dispatch master and two slaves and so on. Selection of the dispatch master
controller is completely automatic and does not disrupt service.
Each controller’s current dispatch master / slave status can be viewed by pressing the Toolbox → Group Network
button. In the Group Network Status screen is a graphic showing the status of each car in the group.
The five main dispatching options available to the user for configuration are:
Parking
Parking & Bus-Stop - Parks cars at predefined levels, separate parking assignments are available for normal, up
and down peak traffic. Bus-Stop service provides rudimentary lift service during landing riser failure.
Ethos Two provides discrete parking assignments for normal, up and down peak traffic conditions. For each of the
three traffic conditions an ON / OFF control, parking timer and parking assignment table has been provided.
Parking ON/OFF - Select ON to park idle cars or OFF to leave idle cars at their current floor level (default = ON).
Parking Timer - The Parking Timer determines the period of time in seconds between the car becoming idle and
assignment of the parking call (default = 10 seconds).
Parking Assignments - The Parking Assignments screen lists a table of parking levels in ascending order of priority
i.e. the first idle car will park at the level entered for Park Assign Index 1 the second idle car will park at the level
entered for Park Assign Index 2 and so on.
The floor entry for Park Assign 1 is also known as the Primary Parking Assignment, it receives a higher level of
coverage than the other parking assignments. A car parked at any of the other parking assignment levels can be
moved to the Primary Parking Assignment level if it becomes unoccupied. A car parked at the Primary Parking
Assignment level will not be re-homed to any other parking level.
The parking assignment table is scanned for non-zero entries from Park Assign-1 through to Park Assign-8. A value
of zero is ignored if there are fewer non-zero entries than the number of cars in service the number of cars allowed
to park is reduced to the number of non-zero Park Assign-levels.
By way of example the following configuration for a 5 car group assigns the first 3 idle cars to levels 1-3-5, the 4th
and 5th idle cars will not receive a parking assignment whilst the parking levels 1-3-5 are occupied:
Park Assign-1 1 (Primary Parking Assignment)
Park Assign-2 3
Park Assign-3 5
Park Assign-4 0
Park Assign-5 0
The Primary Parking Assignment (Park Assign-1) also specifies the Lobby Floor (see Lobby Floor below). The
parking assignment levels are unique to each site and should be adjusted as necessary by the installer.
Peaks
The Ethos Two has special call processing routines for up and down peak traffic. By selectively “aging” landing calls
preference can be given to a particular direction of landing call (also known as boosting).
During an up peak idle cars can be made to park at specified up peak parking levels (refer to earlier section on
parking) plus landing calls at the lobby and up landing calls at all floors can be boosted.
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