Automatic identification method of electric power meter on RS-485 bus

A RS-485 and automatic identification technology, applied in the field of communication, can solve the problems of increasing acquisition equipment and increasing hardware investment, and achieve the effect of reducing workload and equipment cost

Inactive Publication Date: 2011-02-09
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD SHAOXING POWER SUPPLY CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] But the shortcoming of this technical scheme is to increase the input of hardware: or increase collection equipment, or increase the RS-485 port of collection equipment

Method used

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  • Automatic identification method of electric power meter on RS-485 bus
  • Automatic identification method of electric power meter on RS-485 bus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for automatic identification of electric energy meters on the RS-485 bus, using DL / T645-2007 protocol and 2400bps communication rate to combine the following steps of operation: including the following steps:

[0022] 1) The acquisition device uses AAAAAAAAAAAAA as the broadcast address to issue a meter reading command;

[0023] 2) If no response is received, it is considered that there is no qualified energy meter, and the combination test of the protocol and communication rate is completed, and the next combination test of the protocol and communication rate is performed; if a correct response is received, it can start from the response A table address is obtained in the message, and added to the table address list of the acquisition device. The combination test of the protocol and the communication rate is completed, and the next combination test of the protocol rate is performed; if a garbled response that does not conform to the response format in the proto...

Embodiment 2

[0054] A kind of electric energy meter automatic recognition method on the RS-485 bus line, the operation of following steps is combined with the statute of DL / T645-1997 and the communication rate of 1200bps, and step process is as embodiment 1, and its concrete operation is as shown in the following table: at the beginning Use 999999999999 as the broadcast address, and convert it to AAAAAAAAAAAAA as the initial table address after entering the recursive test.

[0055]

[0056]

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Abstract

The invention discloses an automatic identification method of an electric power meter on RS-485 bus, wherein different protocols and communication rates are used for the following operations: firstly using broadcast address to distribute a reading meter order by a collecting apparatus; then if no response received, no electric power meter in match condition exists; if correct response is received, acquiring a meter address from a response message to be added into a meter address list of the collecting apparatus; if a messy code response which is not matched with the response format in the protocol is received, a plurality of electric power meters in match condition exist, taking AAAAAAAAAAAA as initiation meter address, and entering recursive query test; and after the test completes, converging to obtain a group of electric power meter address, protocol and communication rate list. The application of the identification method can save corresponding artificial maintaining work.

Description

technical field [0001] The invention relates to the field of communication and the field of electricity information collection, and provides an automatic identification method for an electric energy meter on an RS-485 bus. Background technique [0002] The current electric energy meter generally provides a digital communication interface, so as to realize automatic meter reading through the collection equipment. In the "Multifunctional Energy Meter Communication Protocol" (DL / T645-1997, DL / T645-2007), three digital communication interfaces are provided: contact infrared optical port, modulated infrared optical port and RS-485 standard serial Electrical interface, among them, the first two are mainly used for communication between handheld devices and electric energy meters, and remote data acquisition almost without exception adopts RS-485 interface. [0003] RS-485 is a bus-type communication, one acquisition device can connect multiple electric energy meters through one R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/12H04L12/26H04L29/06
Inventor 张宏达王伟峰毛文秀陶晖徐文强
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD SHAOXING POWER SUPPLY CO
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