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Remote Wireless Automatic Meter Reading System Based on GPRS

Shi jiong Yuan Sichuan Electric Power Research Institute Qing Hua Road,NO 24 ,Qingyang District, ,Cheng Du City

Si Chuan,China e-mail: [email protected]

Abstract:

For

reliability

and

real-time

data

transfer

requirements of Automatic Meter Reading System(AMRS), we design a remote wireless automatic meter reading system based on GPRS to achieve data transmission between meter reading terminal and the main station.System is easy to install, reliable and rapid for data transmission.

Keywords:

automatic

meter

reading(AMR):

wireless

network: GPRS: TCPI/P protocol I .INTRODUCTION With the rapid progress of mobile communications technology and the deepening reform of the electricity market, more and more information collection instrument was introduced into the production and livelihood. Only if

Figure I GPRS network structure

realize the accurate, real-time, low cost of information

There are two GPRS packet network node: GPRS

collection and control for meter, operators can gain a

service node (SGSN) and GPRS gateway node (GGSN).

competitive advantage in the industry[ I]. Automatic

meter

reading

system(AMRS)

is

GPRS SGSN is responsible for user mobility management,

an

user access, send and receive short messages, packet data

integrated technology to automatically collect and process by

special

equipment

to

meter

with

the

use

forwarding; GGSN is responsible for forwarding user data

of

to other data networks through the Gi interface[2].

telecommunications, computer technology. It greatly saves

Brief summary, the newly introduced wireless network

manpower, material resources, reduce labor intensity, while

elements of GPRS system can be divided into the wireless

ensur real-time meter reading and to avoid errors caused by

part

manual meter reading.

and

data

management,

part. SGSN

Which, is

PCU

is

common

part part

of of

wireless wireless

management and data management, GGSN is entirely part

II. GPRS NETWORK ARCHITECTURE

of data management section. Although a number of other ancillary units are not given in the definition of GPRS

GPRS network is an increase in the existing GSM

system, but essential in the data network, which is part of

network, GGSN and SGSN to send and receive packet mode

GPRS network, such as Domain Name Server (DNS),

data, and take into account the network smoothly the

Dynamic Address Allocation

transmite to 3G. The system network architecture shown in

Server

(DHCP), Network

Time Protocol Server (NTP), Authentication and Radius

Figure l.

Authentication Server. II I.SYSTEM HARDWARE DESIGN According to the functional design requirements. The wireless remote automatic meter reading system is divided into the following sections: Meter pulse acquisition system (hereinafter referred to as collectors). for capturing and storing

the

number

of

pulses;Meter

data

concentrator

(referred to as concentrator) for the regular collection of meter data collector pulse and sending data through the GPRS module to the remote PC data server;GPRS module,

978-1-61284-486-2/111$26.00 ©2011 IEEE

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for wireless data

cycle[4].

communications between Meter data

GPRS interface circuit shown in Figure 3

collection system and remote data server PC;Remote PC data server (referred to as PC data server)for receiving and processing all the meter data to achieve power level query, real-time power analysis and other services. System block diagram shown in Figure 2

[plink

liplink

Channell

Channel N

Figure 2 meter reading system

Figure 3 GPRS interface circuit

In summary, communication is the key to automatic

Overall hardware system is shown in Figure 4

meter reading technology. Therefore, the choice is mainly the choice of means of communication. In automatic meter reading system, the underlying proximal

communication,

namely,

data

collecting

and

communication between the centralized controller, due to the small amount of data and structure is simple, should be through the RS-485 connection. Because the requirements of the wireless remote meter reading system is a real-time, two-way

data

transfer,

and

GPRS

data

traffic

communication is billed, the upper remote communications used in this always-on mode, that is, GPRS module Actively connected to lower computer terminal after launch control center, and to smoothly maintain the link to ensure the normal communication in the future[3]. To ensure the system's data processing capabilities and to meet future system expansion. The system adopts a centralized AT9 1 RM9200 chip. It is a 32-bit ARM7TDMI-S microprocessor

core

with

high

computing

power.

Meanwhile,meet the system functional requirements.

Figure 4 the overall system hardware chart

The chip can be set the following parameters by remote

IV. SYSTEM SOFTWARE DESIGN

or local communication port: the communication-related parameters between the main station and the concentrator;

System

meter reading program; line loss and alarm type parameter;

software

design

is

based

on

windowsXP

measuring meter parameters, including the summary meter,

operating system, using VC programming. Design steps are

meter, common meter; cascade Parameters.

as follows:

GPRS uplink communication uses a Sony GR47 series

I.Monitor Module: start/stop the server data services

of modules, which is a advanced wireless module with a full

for GPRS collection terminal can have a fixed IP address

set of GSM / GPRS voice and data features. Its ultra-small

with the server to send and receive TCP/IP data packet, the

size - all functions are concentrated in an integrated chip

function prototype is BOOL - stdcall DSStartSeryice (u 16t

(only 50 x 33 x 7.2 mm); the most convenient development

uiListen-Port). This, GPRS for PPP dial-up, initiates TCP

- embedded TCP/IP protocol stack, allows the user to the

link to the application and sends a registration packet, the

greatest degree of shortening GPRS product development

server center establish a TCP link. after this application.

668

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2.transmit

module:

This

module

can

send

control

commands to the specified GPRS data collection terminal such as collection terminal address setting, the terminal voltage/current

analog

parameters,

etc..

the

function

prototype is a BOOL-stdcaU DSSendData (u32t mo-demId , U16t len, u8t

*

but).

3.Data processing module: GPRS collection terminal is divided into packets that are registration bag, heart bag and off-line

package.

packages,data

According processing

to

the

different

function

types

of

BOOL-stdcall

DSGetMo-demByPosition (u32t pos, ModemInfoStruct

*

pModemInfo) can make different treatment, then store the required information into the database. 4.The error processing module: The function prototype is

void-stdcall

DS-GetLastError

(char

*

str,

int

nMaxBufSize), which can be obtained the previous API error occurs through the implementation to help us make further processing. V.SUMMARY This design of remote automatic reading meter system is fast and highly reliable. The system ,which connect to Internet through the GPRS network ,can achieve reliable real-time

data

transmission,

especially

overcome

the

shortcomings of traditional transmission mode under a poor environment. REFERENCES [I]

JIANG Zhong-fu,CHI .lian . meter

reading

Equipment.2000, [2]

system

A comprehensive remote real-time

mode

Electrical

Power

Automation

20(2)64-65.

Lu Jje GPRS technology[M],

Bejing University of Posts and

Telecommunications press.2001. [3]

Zhao Feng, Wang Yanwei, Fan Jianhua. GPRS dial-up connection terminal up the whole process of certification. Computer Engineering and Applications .2004 (23) 158-160.

[4]

Tian Fang. Design and Implementation of GPRS Data Terminal Based on Embedded System. Quiu Normal .2006

[5]

Wen zih-cheng. GPRS network technology. Beijing

Electronics

Industry Press, 2005. [6]

RJ (Bud) Bates General Packet Radio Service (GPRS) technology and application. ZHU Hong-bo translation. Beijing, Posts & Telecom Press, .2004.

669

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