Summary: Recommend LonWorks the intersection of bus and the intersection of power line and data transmission check meter design of the module automatically while being long-range, and is checked meter systematic structure and function of checking meter of intellectual Residential Area that the module form automatically.
Keyword: LonWorks bus Little controller Long-range before checking meter Speech

China adopts water gauge, angry table, ammeter to enter a charge method of checking meter ordinarily manually at present, all bring much trouble to user and stopwatch personnel like this. With the development of science and technology, especially the appearance of intellectual Residential Area, high-story high residential building, the traditional one checked meter the way can’t already meet residents’ requirement. It if you can’t enter by family for solving effectively, check meter it if you can’t charge, deposit in a great deal of drawback,last working efficiency, the system will be the best solution to check meter automatically.

Because its fine characteristic of LonWorks bus technology, have already become the on-the-spot bus proposed standard in fact. The topological structure of network of LonWorks has very great flexibility, offer various typical topological structure through many kinds of transceivers, for instance the bus type, star, ring type, phenotype,etc., network information regards device on the way as the communication bridge between different passways. Using the way not only can realize the data transmission between different communication mediums, still can improve response time and security performance of the network.

What the space of Europe Company develops checks meter long-rangely automatically the module adopts the power line to transmit the data because of LonWorks technology, can realize the making a copy of automatically of the household’s gas meter, water gauge, ammeter reading, and have network savvy. Realize on the management computer of the Residential Area or through the urban telephone service that inquires long-rangely that makes a copy of the data.

First, LonWorks check meter module automatically ‘ Node And systematic operation principle

Each one on LonWorks network observes and controls the unit and is called LonWorks intellectual node. Each intellectual node has used a LonWorks to mainly control the module. It is a basic composition unit with nodal intelligence that LonWorks mainly controls the module, it regards Neuron chip as the core, include the transceiver, decipher circuit of the address, reset the circuit, shake circuit and EPROM etc. brilliantly at the same time. Mainly control the module to finish the data transmission of LonTalk agreement through the firmware, function of dealing with etc. that and finish various calculating, dealing with and network newspaper document of I/O incidents that users defined through incident deployment. LonWorks nodal sketch map. Mainly control the module to be used for communication and control: Little the intersection of controller and 89C51 realize to input / output treatment and the intersection of drive and function of data, it is mainly to the count of the input signal of the pulse in checking meter the module, and finish and mainly control the data transmission of the module. Mainly control the transceiver in the module to be responsible for entering the node the network in succession, different communication mediums demand to adopt the corresponding transceiver: In checking meter the module, can adopt and FTT-10A transceiver, is suitable for the paired line medium; Or adopt PLT-22 transceiver, suitable for the power line and communicate the medium.

The system of checking meter automatically is based on LonWorks on-the-spot bus technology. The system is made up of several following parts: Computer, check meter management software, the intersection of data and concentrator, check meter nodal module, repeater, Modem, the intersection of water, electricity and gas and the intersection of pulse and table,etc..

Check meter module gather from various places the intersection of pulse and the intersection of table and pulse, output signal in real time, count, leave pulse in, check meter module in the RAM totally, according to period of time and present moment that set for, add different time slots up to data got to gather, realize and divide period to count. The memory of the module loses the electricity to protect the function to check meter, prevent losing the electricity and losing the accumulating value of pulse. Data concentrator have high-capacity memory, can store 200 data to check meter module. The intersection of concentrator and repeated wheel ask, gather, check meter data of module and store corresponding memory of concentrator in it by every. The concentrator filters the illegal data automatically, unusually deal with communication correspondingly, data of the module of guaranteeing to keep all of a networks of checking meter in the concentrator and checking meter. Characteristic of expecting much and requiring each of data conveyed and is received not to make mistakes in real time etc. that the system has data gathering the module more and dispersing, data transmission of checking meter automatically. When getting on the location computer and gathering the data, the data that can be kept from the concentrator are sent back to the computer directly, need module read data of checking meter from check meter directly. Because data communication does not need to change the agreement, the communication speed is very fast, even meeting LonWorks network and presenting the communication abnormal condition, can send the data back to the host computer rapidly.

LonWorks neuronal chip procedure is divided into two parts: A part is the application program, another part is videoed for the network. The application program determines the function of the module; It determines the module network connects the relation with other module that the network videoes. Installation way can use two kinds: One install way in advance, one install way live.

Install the way in advance: LonWorks control network function very abundant, reach check meter system specifically but speech, the system only uses some functions, and the function relatively immobilizes, the network between its module connects the relation and can be fixed in advance. According to the situation, originally dispose through the way that the parameter that LonMake dispose is changed into through the host computer ordering the way. All check meter to put the good procedure and finish the essential disposition in advance dispatch from the factory, module, annotate the good module serial number. In this way the module does not need installing with LonWorks software after reaching the scene. Adopt, install way in advance, user can finish, check meter installation of system can without understanding LonWorks relevant knowledge.

Install the way live: Adopt these kind of installation way and require to install to personnel to the scene to set up the network to video to the module one by one with LonWorks software, and look like the network and download the module to each one and check meter. This kind of disposition is flexible, checks meter the module can share a network with many kinds of LonWorks module and exchange the data each other. Adopt the on-the-spot installation way and go on and can fully utilize LonWorks to control various functions of the network to dispose the system, but there are higher requirements on engineering company, need knowing more deeply.

Check meter design of module want, solve following problem:

1 Check meter module can meet, export, can gather pulse signal correctly and can testing signal wire broken circuit or the intersection of person who short out and abnormal condition by various the intersection of pulse and table.

2 Solve restriction and dependability of the distance of communication of power line.

1.Check meter automatically hard yuan of module design

This module is specially used in the making a copy of automatically of water gauge, ammeter and gas meter. Can copy and read 24 pulse exporting tables directly each module. Monitor the part in the pulse, has adopted the terminal resistance to match method and A/D technology, gather the pulse to turn into the collection of analog quantity, and then analyze its A/D sampled value, can discern the state of the intersection of pulse and table, and the put through disconnected state of finding reach circuit.

LonWorks bus mainly controls the communication of module and 89C51 to adopt the synchronous serial I/O way, uses Neurowire top management way, namely is mainly controlled the module to drive the synchronous clock to input and the chip selection signal is exported, 89C51 receives the synchronous clock to import. Mainly control in the module IO8 pin of Neuron chip export the synchronous clock; IO9 pin exported by the serial data; IO10 pin is the serial data entry; Choose IO5 pin as the chip selection signal to export. 89C51 transmits the data by the way of cutting off, and add the check-up yard into agreement frame, in order to guarantee the exactness of the communication data.

Adopt pairs of the intersection of CPU and technical design check meter module possess following function:

1 Gather the pulse tables of No. 24 at the same time, can support to input many kinds of input ways in single contact, double-contact, level; Can support three kinds of different pulse tables at the same time.

2 There are pulse tables that is wired and broken, shorts out and measures the function.

3 Can gather the pulse width