Coding method for fire-fighting two-bus priority communication

A coding method and bus technology, which is applied in the field of communication coding of two fire-fighting buses, can solve the problems of slow communication speed, complex software design, slow communication speed, etc., and achieve the goal of improving response speed, communication response speed and reliability Effect

Active Publication Date: 2018-11-16
江苏格澜得智能电气有限公司
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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 Wh

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  • Coding method for fire-fighting two-bus priority communication
  • Coding method for fire-fighting two-bus priority communication
  • Coding method for fire-fighting two-bus priority communication

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Embodiment Construction

[0015] The technical solution of the present invention will be further described below in conjunction with the embodiments and drawings.

[0016] This embodiment provides a coding method for the priority communication of the firefighting two buses: the master station uses three voltage signals (such as image 3 ), VH high voltage signal is used to transmit idle signals and the master station to supply power to the slave station, generally 24V~36V, VL low voltage signal is the output level of the master station when the slave station responds and the bus short circuit fault feedback, generally 1 / 3VH, The zero voltage signal of V0 is the output level when the downstream data of the master station is 0. The slave station responds to the data by means of load resistance, and the slave station responds when the master station sends a VL low-voltage signal. The power supply voltage of the master station is VH. When the master station sends a VL low-voltage signal, the internal diode D1...

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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...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04J3/06H04L12/40
CPCH04J3/0638H04L1/0009H04L12/40078
Inventor 曾新民
Owner 江苏格澜得智能电气有限公司
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