Abstract: A telephone transmit circuit is connected through a resistor to a junction at which a telephone line interface circuit is connected, a transhybrid cancellation circuit is connected to the transmit circuit and includes a high frequency shunt matching network having capacitive and inductive components and a low frequency matching circuit which comprises a lead lag network having capacitive components, the output of the transhybrid circuit being connected to a summing junction at the input of a telephone receiver. The other input of the summing network is connected between the resistor and the interface circuit, whereby a portion of the transmit signal is fed back out of phase to the receive amplifier so as to cancel out undesirable side tones, across a predetermined frequency range.

Abstract: In a two-way ring elevator communications system, characterized in that a controller is associated with each elevator to process inter-elevator messages and the controllers of the elevators are linked together in serial fashion on a two-way communications system so that the messages of each controller are passed along to and processed by each of the other controllers in two directions on two independent rings, whichever of the two rings is properly functioning is used at full capacity but if neither ring is properly functioning then both rings are operated at reduced capacity, the reduction being carried out by reducing the time between reassignments of elevator hall calls.

Abstract: Deeming a full elevator car available for servicing a hall call is accomplished by testing if all of the car calls for the car are between the position of the elevator car and the hall call. If not, the full car may still be deemed available if there is a special stop car call between the position of the car and the position of the hall call or if there is at least one car call between the position of the car and the position of the hall call and there are no other hall calls between the position of the car and the position of the hall call.

Abstract: Assignment of a hall call to an elevator car occurs only if servicing the hall call will not have an adverse effect on the response times of other registered calls for the car. Assignment of a hall call is made to the car having the lowest number of registered calls which cross a predetermined response time threshold in response to servicing the call.

Abstract: A LAN elevator network includes (a) a pair of redundant car buses for exchanging signals with car control system elements, (b) a pair of redundant group buses for exchanging signals with the redundant car buses through a car-group bridge, and (c) a pair of redundant building buses, which exchange messages with a building controller, through a group-building bridge. Communication among all nodes on the car bus, group bus, and building bus occurs using a single protocol. Each communications element on a bus communicates with the bus using a communications coprocessor including a transmitter and a receiver.

Abstract: A LAN elevator network includes (a) a pair of redundant car buses for exchanging signals with car control system elements, (b) a pair of redundant group buses for exchanging signals with the redundant car buses by means of a car-group bridge, and (c) with a pair of redundant building buses, which exchange messages with a building controller, by means of a group-building bridge. Communication among all nodes on the car bus, group bus, and building bus occurs by means of a single protocol. Each communications element on a bus communicates with the bus by means of a communications coprocessor including a transmitter and a receiver.

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.

Abstract: Fuzzy sets indicative of likelihood of additional weight elevator passengers may have in a given country compared with a standard international low passenger weight, indicative of packages which may be carried up at certain times of day or carried down at certain times of day by passengers in the elevator, and indicative of the weight of additional clothing which may be worn due to different seasons in temperate climates are all added to a basic single passenger fuzzy set so as to more accurately reflect the likely weight of a single passenger. From this are derived fuzzy sets for any number of passengers which may possibly occupy an elevator, which in turn are utilized to provide a passenger fuzzy set indicative of a given weight of the elevator having been caused by various numbers of passengers. Processing details are also disclosed.

Abstract: The data processor (OCSS) 35 of an elevator car that can be transferred from a group 38 of elevators (a swing car) is switched out of a ring of similar data processors 31-34 into another ring of data processors 36, 37 which comprise a separate group 39 (FIG. 2 ). Or, the processor 35 can be swung from the group 38 into operation by itself in the simplex mode (FIGS. 3 and 4) when connected (66) to a separate hall call button and enunciator lantern riser 56.

Abstract: For any given sensed load weight in an elevator car, the union (30-36) of a fuzzy set (FIG. 2) indicative of the likelihood of possible number of male passengers causing the sensed weight, taking into account the relative mix of males in the total population of the building (12-22) with a fuzzy set (FIG. 4) indicative of the likelihood of possible number of female passengers causing the sensed weight, taking into account the relative mix of females in the total population of the building (14-24), forms a passenger count fuzzy set (FIG. 5) indicative of the likelihood of a given number of passengers corresponding to each sensed or discernible elevator load weight for use in dispatching of elevator cars. A lookup table may be established (FIG. 7) for all possible weights.

Abstract: An adaptive elevator security system has a security module (52) which uses data stored in a configuration data element (64) to update a security state data element (62). The security module (52) provides data from a raw car/hall call data element (56) to a filtered car/hall call data element (58) according to data stored in the security state data element (62).

Abstract: Apparatus (82) for providing write protection for EEPROMs (10) intended as a replacement for installed ROM devices, includes write protection circuitry (54) mounted on one surface (88) of a circuit board (84), the other surface (86) receiving the EEPROM, providing a direct plug-in module for retrofit of installed ROM devices.

Abstract: A serial signal communications system includes a central station unit connected through a balanced impedance signal communication bus to one or more remote station units.