Elevator hall call cross-cancellation device
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United States of America Patent
Stats
-
Oct 18, 1994
Grant Date -
N/A
app pub date -
Dec 21, 1992
filing date -
Dec 21, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for dispatching elevator cars to hall calls in a system where there are two types of elevator controllers (12, 14) in operation, one (12) of which operates using relay logic. The calls are stored in a relay logic memory common to both elevator controllers (12, 14). A first controller reads the call information directly from the memory (18); the second controller reads the memory through a cross cancellation device (10) which multiplexes the information from the memory so that the calls are provided on a serial link (32) to the second controller (14). The second controller (14) is programmed to respond to calls which the first controller (12) has not answered.
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