Electric energy meter reading method based on DLT645-2007 protocol

Abstract

The invention relates to an electric energy meter reading method based on a DLT645-2007 protocol, and belongs to the technical field of intelligent power grids. During message interaction, the master station equipment enables a plurality of data identifiers needing to be read to form a list in sequence, a control word field is set to be 1CH, a length field is filled with a corresponding value, a checksum value is calculated, a 645 protocol message is packaged, and the message is sent through a serial port; the slave station equipment receives the message, judges the legality of the message, de-encapsulates the message, and takes out each data identifier in sequence; the slave station device fills in data of each application layer according to each data identifier, encapsulates each data identifier and data into a 645 protocol reply message data field, fills in the total length of the data field in a length field, sets a control word field to 9CH, calculates a checksum value, and sends a message through a serial port; and the master station equipment receives the message, judges the legality of the message, de-encapsulates the message, and sequentially takes out the data of each data identification application layer. According to the invention, the data reading efficiency can be improved, and the protocol deficiency is made up.

Description

technical field [0001] The invention relates to a meter reading method of an electric energy meter based on the DLT645-2007 protocol, and belongs to the technical field of smart grids. Background technique [0002] DL / T645 is a communication protocol for electric energy meters used in the field of electric power. There are 97 editions and 2007 editions. At present, the 2007 version is used more, and the 645 protocol involved in this article refers to the 2007 version without special instructions; DL / T698 is the next-generation electric energy meter communication protocol, referring to the object-oriented design idea. The meters that apply the two protocols are also called 645 meters and 698 meters. Some meters are capable of supporting both protocols. The 645 protocol is relatively simple, and the 698 protocol is relatively complex. At present, most residential areas in the city still use 645 meters, replacing a large number of previous 645 meters with 698 meters. The inv...

AI Technical Summary

Problems solved by technology

The 645 protocol is relatively simple, and the 698 protocol is relatively complicated

The author found in the research that although the 698 protocol is relatively flexible, in actual use, the communication between devices is still a fixed message format, and flexibility is not dominant; and the 698 protocol needs to consume more bytes, which is not as good in communication efficiency. It is not as good as the 645 protocol; the implementation of the 698 protocol on embedded devices requires more hardware resources, while the 645 protocol requires less; the above characteristics determine that the 645 protocol still has a certain vitality

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