Troubleshooting
5-38 Manual # 42-02-2P24
Duplexing
Duplexing allows one car controller to assign hall calls to itself and one other car. Duplexing
requires a connecting cable and selecting the Duplex option (see “F1: Program Mode” on
page 4-11). Duplexing improves hall call assignment, increases efficiency, and decreases wait
times.
Dispatching Algorithm
The dispatching algorithm for assigning hall calls is real-time, based on estimated time of
arrival (ETA). In calculating the estimated time of arrival for each elevator, the dispatcher will
consider, but not be limited to, the location of each elevator, direction of travel, existing hall and
car call demand, door time, flight time, lobby removal time penalty, and coincidence call.
Hardware Connections
There are three critical points in duplexing hardware:
• Proper grounding between the two controller subplates
• Proper installation of the duplexing cable
• Jumper JP3 on each HC-MPU board must be in position
Hall calls will be connected to both cars simultaneously. Once in duplex configuration, either of
the two controllers can become the dispatcher of hall calls. The controller that assumes the dis-
patching duty on power up remains the dispatching processor until it is taken out of service. If,
for any reason, the communication link between the two controllers does not function, each car
will respond to the registered hall calls independently.
In a duplexing configuration, the controller that assumes dispatching duty is identified by the
letter D in the upper left corner of the LCD. The other car is identified by the letter S, in the
upper left corner of the LCD. If the upper left-hand corner of the LCD is blank (neither D nor S
displayed), the cars are not communicating, and troubleshooting will be required to determine
the cause.
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