Introduction: Since the State Radio Regulatory Commission 470 ~ 510Mhz wireless plan to the civilian use of measuring instruments and other types of equipment, various types of meter manufacturers have started low-power wireless data transmission of research and product design.
Industrial applications which may affect the overall design of the different schemes, glue stick while the local department in charge of meter have also introduced incentives to promote the kind of industry, technological innovation and product applications.
1. Low-power wireless communications in the meter application and development.
After the development of the meter measuring the mechanical process of electronic measurement is being measured by the electronic access to the electronic intelligence of the stage, and developed rapidly.
Application of automatic meter reading meter through an infrared meter, RS485 bus communication meter, PLC Power Line Carrier Record, and is currently developing low-power wireless meter reading, GPRS meter reading stage. glue gun In the current market, the coexistence of the total meter reading, complementary, and the national grid in the new meter standard, the communication module has been made mandatory for the physical interface, but also for meter is compatible the various communication pave the way the road. The reason why low-power wireless meter reading meter reading mode of competition in various meter manufacturers caused concern, mainly in the following advantages:
1) copy the pass rate.
2) communications and high efficiency.
3) The installation cost is low.
4) The application can be extended more.
5) low-power wireless technology low, easily formed product.
Overall in the practical application of small and medium-power wireless communication at the current stage can be solved without the main home meter reading, real-time uploading of data, meter fault monitoring and rational allocation of future intelligent power grid and more.
Meter as a stable power supply, relative to the process of development of intelligent, measured and intelligent control of their own, the process of data transfer requirements of the energy consumption is relatively not very demanding, so that flexibility in the application of the wireless meter reading problems encountered, but there are also three other tables demanding electrical specifications.
The application of the basic requirements of the meter has the following technical features:
1) self-networking functions.
2) The function of automatic frequency communication.
3) the expansion of demand based on function from the update feature.
1.1 The ad hoc network function.
Wireless ad hoc network is a group of wireless links for communications, was formed by a dynamic network of mobile nodes, it is a multi-hop temporary autonomous system.
Single-hop wireless networks with different network nodes from the multi-hop data forwarding through the data exchange mechanism, the need for packet forwarding routing protocol decisions. Transformation of the irregular radio channel, the nodes move, join and leave networks will lead to the dynamic change of network topology, routing protocol role is in this environment, the monitoring network topology change, exchange routing information. Positioning the destination location, production, maintenance and selection of routes, and forward data depending on the chosen route and provide network connectivity. It is the basis of mobile nodes communicate with each other.
The main features of wireless ad hoc networks without fixed infrastructure is supported, no pre-configured host can at any time, any place quickly build up a mobile communications network; nodes can move, the dynamic changes in network topology, there is no fixed base station or route-specific operating as a network management center, network, each node is the function of both hosts and routers; nodes to communicate on an equal manner, with a highly collaborative, network distribution routing Arts usually control mode, the network than the central structure has stronger robustness and survivability and so on.