Coding method for fire-fighting two-bus priority communication

Abstract

The invention discloses a coding method for fire-fighting two-bus priority communication. When one main station and a plurality of slave stations at two fire-fighting buses carry out communication, the coding method is employed; the priority request reporting only needs a one-byte data transmission process; and priority data processing is based on a transmission process with 10 to 100 bytes. Compared with the conventional polling method, the coding method enables the communication response speed to be increased by hundreds of times; and compared with the complicated priority communication protocol design, the coding method enables the response speed to be increased by dozens of times. Besides, with the coding method, a bus short-circuit fault can be fed back; only one data transmission process is needed to the greatest extent; the bus fault and the bus output protection can be fed back quickly; and the e reliability of the fire protection product is improved.

Description

Technical field [0001] The invention provides an encoding method capable of supporting bus priority communication and fast feedback of bus short-circuit faults, and in particular relates to a communication encoding method suitable for fire fighting two buses. Background technique [0002] At present, the two buses are widely used in the fire protection industry, supporting the characteristics of bus power supply, long communication distance, convenient wiring, and strong load capacity. However, the physical layer design (downlink voltage, uplink current) of the two firefighting buses determines that the communication speed is relatively slow (no more than 9600bps). In actual applications, the number of communication devices on the bus is relatively large, resulting in slower communication speed. When the polling method is used, the key data response delay may take tens of seconds, which is not suitable for some occasions with high response speed requirements. Instead, the more co...

AI Technical Summary

Problems solved by technology

However, the physical layer design of the two fire-fighting buses (downstream voltage, upstream current) determines that the communication speed is relatively slow (not exceeding 9600bps), and in practical applications, the number of communication devices on the bus is relatively large, resulting in slow communication speed. Conventional When the polling method is used, the response delay of key data may take tens of seconds, which is not applicable to some occasions that require a high response speed. However, if the more complex priority communication protocol design is adopted, the software design is complicated, the workload is heavy, and the response It also takes seconds

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