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Baud rate self-adaptive design based on electric meter serial port

A baud rate and self-adaptive technology, applied in the direction of transmission modification based on link quality, electrical components, adjustment of transmission rate, etc., can solve the problem of not being able to adapt in real time

Inactive Publication Date: 2021-01-12
QINGDAO TOPSCOMM COMM +1
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the baud rate of the ammeter needs to be issued to notify the ammeter of a complete message, which cannot be self-adapted in real time

Method used

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  • Baud rate self-adaptive design based on electric meter serial port
  • Baud rate self-adaptive design based on electric meter serial port
  • Baud rate self-adaptive design based on electric meter serial port

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Embodiment Construction

[0017]The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings.

[0018]The invention refers to the provisions in the China / South China Network Communication Protocol when designing, and the interaction message between the master station and the electric meter has 4 leading characters. The data frame format of the preamble is as followsfigure 1 As shown, the data frame format can be configured into different formats, but when the current leader data is transmitted, the falling edge of the start bit to the first rising edge occupies two bits.

[0019]The electricity meter is based on the premise of capturing the level edge change of the serial port, timing T01 when receiving the first falling edge, and timing T02 when receiving the first rising edge. Then calculate the baud rate of this byte according to the time occupied by each bit. The calculation formula is: bps=2 / (T02-T01).

[0020]The invention is designed...

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Abstract

The invention provides a design scheme of a real-time self-adaptive serial port baud rate of an electric energy meter. The method comprises a self-adaptive detection baud rate principle, an abnormality prevention detection mechanism and a post-abnormality self-recovery nursing mechanism. According to the design, the mode of notifying the electric meter to modify the baud rate by an independent command can be liberated, each frame of message can adapt to different baud rates, the real-time performance and the reliability are improved, and the serial port configuration speed is increased.

Description

Technical field[0001]The invention relates to a design logic for realizing self-adapting baud rate of an electric meter.Background technique[0002]The communication between the meter and the master station follows the communication protocol DL / T645 or DL / T698.45. When the message received by the meter meets the protocol, it can communicate with the master station normally. The serial port baud rate is an important configuration parameter. one.[0003]At present, the baud rate of the electric meter has different default values ​​according to different phenotypes, and the carrier serial port, infrared serial port and 485 serial port have independent default baud rates. When the baud rate needs to be changed, the master station needs to send a complete message to notify the meter to change the baud rate. This method is time-consuming and occupies the serial port channel.[0004]With the continuous development of electric meters, the above methods should be improved and solved.Summary of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00G06F13/42
CPCH04L1/0002G06F13/4282
Inventor 刁瑞朋黄涛刘大专
Owner QINGDAO TOPSCOMM COMM
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