At present, the country's comprehensive planning to promote industrial strategic transformation, the management and utilization of energy are also becoming more and more important, and are included in the national key projects. Aiming at water meters and gas meters, intelligent collection and management put forward higher requirements. It has become inevitable to integrate intelligent and effective management into the era of the Internet of Things! Shenzhen Anmet Technology Co., Ltd. has a history of 6 years in the collection and management of water and gas meters. It has good cooperation with major water and gas meter factories and has rich experience in this field. This article will focus on the introduction of the wireless water and gas meter meter reading method, and the advanced self-organizing network mode meter reading method developed in recent years. At present, the water and gas meter wireless meter reading mainly has the following three schemes: A: collector mode meter reading Table B: Meter reading in manual meter mode. C: Meter reading in wireless ad hoc network mode. Each of these three methods has advantages and disadvantages. With the development and progress of chip and network technologies, meter reading in wireless ad hoc network mode has gradually become Now the mainstream of development.
In wireless ad hoc network meter reading, the concentrator is responsible for meter reading and routing management. The module is similar to the previous method using periodic wake-up reception (such as once per second). Fully automatic networking, with multi-level routing, covering the area Increased greatly, any module can be used as a route, all routes are automatically selected, and the route can be automatically restored when the environment changes, without manual intervention. The meter reading speed is about 2-10 seconds per meter. The installation is simple and the success rate of meter reading is very high. High. At the same time, wireless self-organizing network meter reading also supports manual meter reading mode, so it integrates the advantages of the two modes. The power saving principle of the wireless self-organizing network meter reading module is the same as the previous mode, which also uses asynchronous periodic wake-up reception, so the power consumption is similar. The disadvantages of wireless self-organizing network meter reading are: slightly higher cost, complicated software, and unbalanced power consumption of the module. Due to the routing function of the module near the concentrator, the power consumption will be more when meter reading is performed. Standby redundancy is solved, but this problem is not outstanding for the water and gas meters that are only copied a few times a month.
The WMRNET wireless network developed by Shenzhen Anmet Technology Co., Ltd. consists of a concentrator and several modules, as shown in Figure 4. The operation of reading data of the user is all completed by the concentrator. In the network protocol, the user is shielded from the work of networking and maintaining the network. The user can always query the module and its status on the network and use the concentrator to read the table through the module. Data, without having to care about and interfere with the operation of the network, all network maintenance work is completed in the background software. Similar to the ZIGBEE network, the WMRNET wireless network networking method is a top-down automatic networking method. At the same time, the wireless network adopts a robust mesh topology and uses the strength of the transceiver field to determine the quality of the link to determine the networking conditions. Each module of the network can have multiple paths, and one module supports multiple parent modules. Any module can be used as a parent module, and the wireless network can automatically select a reasonable routing path. In the active WMRNET wireless network, when the new module is within the network coverage, the WMRNET wireless network will automatically recognize the module ID and join the network at a certain time. When the network is silent, the routing and module status of the network is in a frozen state, but users can still use the concentrator to read the table data through the module.