A fire industry bus coding method

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

Active Publication Date: 2021-08-10
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 higher requirements on the capacity of external component capacitors, and the hardware purchase cost will be higher; at the same time, the load capacity of the bus will also deteriorate, resulting in reduced power supply and drive capabilities for back-end devices

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  • A fire industry bus coding method
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Embodiment Construction

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, and the mode of the present invention includes but 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 degradation caused by too long idle time of the bus. Main process of the present invention is as follows:

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

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Abstract

The invention discloses a fire-fighting industrial bus coding method, which includes: (1) a fire alarm controller uses a low-level pulse with a duty ratio of 0.3 or less as the starting point of bit code division to perform coding, and synchronizes the signal; (2) When encoding, the bit "0" is determined by the pulse width between two level falling edges, and the bit "1" is determined by the pulse width between two level rising edges; Give an independent synchronous signal; (3) Repeat step (2) for continuous encoding until the encoding is completed, and then send codes to the smart components through the bus. The invention has a simple process and a simple and convenient coding method, and can avoid the problem of long idle time of the bus while ensuring the accuracy of data transmission. Therefore, the invention is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of fire protection, in particular to a fire protection industrial bus encoding method. Background technique [0002] In the existing fire alarm control system, when using the bus to send codes, the controller host needs to pull it up in a low-level state first. When the host sends a series of data, such as "00101", the start bit of information transmission It is the first bit of data, and the time for each bit of data transmission is fixed, so the time for transmitting a series of data is also a fixed value. In this encoding method, during the process of information transmission, the clock may be advanced or delayed. 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. Finally, The coding is incorrect, which reduces the precision of the clocks at both ends of the communication, which in turn ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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