Master-slave signal transfer system for elevator
First Claim
1. A master-slave system for monitoring transmission of elevator cell signals comprising:
- a plurality of slave stations each having call signal transmission means for transmitting call signals and illuminating call registration lamps;
a master station which receives said call signals from said slave station and transmits a call registration signal to a slave station responding to a call signal thereupon;
each of said slave stations having;
a timer which measures a time interval between transmission of a call signal and receipt of a call registration signal at a respective slave station;
reply detection means, for transmitting an output signal when a call registration signal has not been received within a predetermined time interval; and
abnormality detection means operable responsive to the output signal from said reply detection means for initiating retransmission of a call signal and resetting said timer, said abnormality detection means also being operable for extinguishing said call registration lamps when the output signal is not transmitted after retransmitting a call signal a predetermined number of times.
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Accused Products
Abstract
A signal transfer system for an elevator including a master station and a plurality of slave stations, each slave station having provision for generating call signals and illuminating a call registratioin lamp. The master station generates a call registration signal in response to cage call and hall call signals. Each slave station also includes a timer which measures the time interval between transmission of a hall or cage call signal and a call registration signal. When the call registration signal is not received within a predetermined period of time, the respective slave station retransmits the hall or cage call signal. The call registration lamp is extinguished if the slave station has not received the call registration signal after a predetermined number of signal retransmissions.
20 Citations
4 Claims
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1. A master-slave system for monitoring transmission of elevator cell signals comprising:
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a plurality of slave stations each having call signal transmission means for transmitting call signals and illuminating call registration lamps; a master station which receives said call signals from said slave station and transmits a call registration signal to a slave station responding to a call signal thereupon; each of said slave stations having; a timer which measures a time interval between transmission of a call signal and receipt of a call registration signal at a respective slave station; reply detection means, for transmitting an output signal when a call registration signal has not been received within a predetermined time interval; and abnormality detection means operable responsive to the output signal from said reply detection means for initiating retransmission of a call signal and resetting said timer, said abnormality detection means also being operable for extinguishing said call registration lamps when the output signal is not transmitted after retransmitting a call signal a predetermined number of times. - View Dependent Claims (2, 3)
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4. A master-slave system for monitoring the transmission of elevator cage call and elevator hall call signals comprising:
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a plurality of slave stations associated with hall call registration lamps disposed in hall panels of respective floors which transmit hall call signals and illuminate the hall call registration lamps; a plurality of slave stations associated with cage call registration lamps disposed in cage panels of respective cages which transmit cage call signals and illiminate the cage call registration lamps, a master station which receives call signals from said slave stations and transmits a call registration signal to a slave station in response to a call signal therefrom; each of said slave stations having; a timer which starts a timekeeping operation when a respective slave station transmits the call signal to said master station, reply detection means for receiving an output of said timer and for transmitting an output signal when a call registration signal from said master station has not been received within a predetermined time interval measured from the start of the time keeping operation, and abnormality detection means for retransmitting a call signal to said master station responsive to said output signal and for extinguishing an associated registration lamp when the call registration signal is not received by the reply detection means after retransmitting the call signal a predetermined number of times.
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Specification