Fire-fighting industrial bus encoding method

A technology of industrial bus and encoding method, which is applied in the direction of code conversion, electrical components, individual digital conversion, etc., can solve the problems of high hardware purchase cost, reduced power supply and driving capacity of back-end equipment, and poor bus load capacity, etc., to ensure Accuracy, ensuring power supply and drive capability, reducing the effect of requirements

Active Publication Date: 2017-06-30
光和电科技(广东)有限公司
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Problems solved by technology

Although in this way, there are synchronous signals generated when the level changes, thereby reducing the error caused by the delay or advance of the clock during encoding, but in each level change period, due to the long idle time, the There will be highe

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  • Fire-fighting industrial bus encoding method
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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the description of the drawings and the embodiments. The manner of the present invention includes but is not limited to the following embodiments.

[0018] Such as figure 1 , 2 As shown, the present invention provides a high-efficiency bus encoding method, which can not only ensure the accuracy of data transmission, but also avoid the load capacity deterioration caused by the excessively long bus idle time. The main process of the present invention is as follows:

[0019] First, a low-level pulse with a very small duty cycle (less than 0.3) is used as the starting point of the bit division code for encoding, and the signal is synchronized. When encoding, the bit "0" is determined by the pulse width between the two falling edges of the level (the pulse width is 400-500μs, including a low-level pulse width of 50-100μs), and one of the two rising edges The pulse width in between determines the bit "1" (t...

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Abstract

The invention discloses a fire-fighting industrial bus encoding method comprising the following steps: a fire alarm controller carries out encoding with a low-level pulse of which the duty ratio is below 0.3 as the starting point of bit code division, and synchronizes the signal; (2) during encoding, the bit '0' is determined according to the pulse width between two level falling edges, and the bit '1' is determined according to the pulse width between two level rising edges; and every two falling edges are given a separate synchronization signal during encoding; and (3), the step (2) is repeated, continuous encoding is carried out until encoding is completed, and a code is sent to an intelligent component through a bus. The process is simple. The mode of encoding is easy. The problem that a bus is idle for a long time is avoided while the accuracy of data transmission is ensured. Therefore, the method is suitable for popularization and application.

Description

Technical field [0001] The invention relates to the field of fire protection technology, and in particular to a fire protection industrial bus coding method. Background technique [0002] In the existing fire alarm control system, when using the bus to send codes, the controller host must first pull it up in a low level state. When the host sends a string of data, such as "00101", the start bit of the information transmission For the first bit of data, the time for each bit of data transmission is fixed, so the time for transmitting a string of data is also a fixed value. In this encoding method, the clock may be advanced or delayed in the process of information transmission. Therefore, when encoding, an error occurs during the transmission of the first bit of data, which will cause the entire data encoding process to form a cumulative error. The encoding is incorrect, which reduces the accuracy of the clocks at both ends of the communication, which in turn reduces the accuracy ...

Claims

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Application Information

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IPC IPC(8): H03M5/12
CPCH03M5/12
Inventor 不公告发明人
Owner 光和电科技(广东)有限公司
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