Data transfer unit clock synchronization method

A technology of data transmission unit and clock synchronization, applied in the direction of digital transmission system, transmission system, synchronization device, etc., can solve the problems of increasing the complexity of hardware design and increasing the cost of the system, and achieve a simple and effective way and meet the requirements of system accuracy. Effect

Active Publication Date: 2018-01-23
NINGBO SANXING MEDICAL & ELECTRIC CO LTD
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  • Application Information

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Problems solved by technology

This method will increase the complexity of the hardware design and increase the system cost

Method used

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Embodiment Construction

[0020] The present invention is further described through the following specific embodiments, but the present invention is not limited to the following specific embodiments.

[0021] A data transmission unit clock synchronization method, it comprises the following steps:

[0022] (1) The main board sends a timing pulse to each sub-board at time t0, and at the same time the main board sends the number of milliseconds tm corresponding to time t0 to each sub-board at time t0 through the communication bus;

[0023] (2), record the time when each sub-board receives the timing pulse as t1n, and record the time when each sub-board receives the number of milliseconds tm as t2n, where n is the number of each sub-board;

[0024] (3) Convert t1n and t2n into corresponding milliseconds t1n' and t2n', and then calculate a bus transmission and processing time difference Δtn through t1n' and t2n',

[0025] Δtn=t2n'-t1n';

[0026] (4), through tm and Δtn, calculate the number of millisecond...

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Abstract

The invention relates to the field of clock synchronization methods, in particular to a data transmission unit clock synchronization method. The method mainly includes the steps that firstly, the millisecond tn' corresponding to the clock tn of a main board is calculated when each auxiliary board receives tm; secondly, the system clock is obtained when the millisecond tm is received; thirdly, synchronization correction is conducted. The data transmission unit clock synchronization method is low in requirement for hardware, easy to achieve and capable of meeting the requirement for system accuracy.

Description

technical field [0001] The invention relates to the field of clock synchronization methods, in particular to a data transmission unit clock synchronization method. Background technique [0002] The data transmission unit (DTU) is a wireless terminal device specially used to convert serial data into IP data or IP data into serial data for transmission through a wireless network. The prior art data transmission unit used in substation monitoring mainly includes a main board and multiple sub-boards. Data transmission is realized between the main board and the sub-boards through the CAN bus and the RS485 bus. In order to enable the data transmission unit to be timely Detect the working status of each line in the distribution network and make timely responses to various statuses to realize real-time monitoring of the distribution station. The clock error between the boards in the data transmission unit is required to be at most 1 millisecond. In the prior art, there are mainly t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00
Inventor 郑坚江袁志民刘杰
Owner NINGBO SANXING MEDICAL & ELECTRIC CO LTD
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