A ZigBee Power Wireless Meter Reading Data Transceiver Terminal Design

Abstract: A ZigBee power wireless meter reading data transceiver terminal design information is provided by excellent flowmeter and flowmeter manufacturers. Introduction With the continuous rise of wireless networks, due to the great advantages of wireless network technology, more and more industry wired products and technologies are replaced by wireless. In my country, automatic wireless meter reading technology (AMR) is a new type of Meter reading technology, with. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of a ZigBee power wireless meter reading data transceiver terminal design article. Introduction With the continuous rise of wireless networks, due to the great advantages of wireless network technology, more and more industry wired products and technologies are replaced by wireless. In my country, automatic wireless meter reading technology (AMR) is a new type of Meter reading technology has the advantages of easy operation, low cost, and no entry into the home. As an emerging wireless network technology, ZigBee has the characteristics of low power consumption, low speed, high reliability and strong confidentiality. Compared with the higher network cost of other wireless technologies, the frequency band greatly reduces the cost and is very suitable for automatic wireless meter reading systems. The terminal designed in this paper is an important part of wireless meter reading. The data collection mainly adopts RS485 bus and MCU control module, and the wireless transmission part adopts ZigBee wireless communication module. 1. Analysis of ZigBee protocol The ZigBee protocol stack consists of physical layer, data link layer, network layer and application layer in turn from the bottom layer. The physical layer and data link layer are formulated by the IEEE802.15.4 working group. The Application Layer (APL) is formulated by the ZigBee Alliance. The physical layer defines 3 traffic levels: when the frequency is 868MHz, it provides a transmission rate of 20Kb/s; when 915MHz is used, it provides a transmission rate of 40Kb/s; when 2.4GHz is used, it can provide a transmission rate of 250Kb/s Speed, in our country uses this free frequency band. The data link layer can be divided into a logical link control sublayer (LLC) and a medium access control sublayer (MAC). Its functions include the segmentation and reassembly of data packets, the sequential transmission of data packets, and the establishment and maintenance of wireless links. and dismantling, frame transmission and reception in acknowledgment mode, channel access control, frame check, reserved time slot management and broadcast information management, etc. The functions of the network layer include topology management, MAC management, routing management and security management. The application layer is the top layer of the protocol stack and defines various types of application services. This system mainly involves the design of data acquisition terminal nodes in ZigBee network, and can also be used as a network router. 2. Overall design of wireless meter reading data transceiver terminal RS485 bus has strong anti-common mode interference ability, can carry out multi-point and two-way communication, and allows one or more devices to be driven on a pair of twisted pairs, so that a The transceiver manages multiple user meters. Based on the RS485 bus meter, it is simple and easy to operate, and the cost is low. Many RS485 smart meters are used in the market, and the system can be widely used. The wireless Zig-Bee module receives the data signal from the microcontroller system through the SPI interface, and sends the data signal out. The wireless meter reading data transceiver terminal plays the role of routing and terminal in the entire meter reading system, and is a full-function device FFD (Full Function Device). The overall design idea of ​​the system is: collect the meter data through the RS485 bus, then process it through the MCU circuit, send it to the ZigBee wireless communication module through the RS232, SPI interface, and finally send it to the router node or network coordinator using the wireless communication module. The overall structure of the system is shown in Figure 1. 3. Hardware design of transceiver terminal The terminal system mainly includes three parts: electricity meter data collection circuit, wireless transmission circuit and power supply circuit. (1) The meter data collection circuit is mainly the MCU control circuit, which processes the data sent by RS485. It mainly consists of MCU chip, RS485 control chip, optocoupler isolator, clock circuit, voltage regulator circuit, etc. (2) The wireless transmission circuit mainly receives the processed data of the MCU through the SPI interface and sends it through the RF radio frequency antenna. (3) The power supply circuit mainly completes the conversion of AC 220V voltage into DC voltage, and then completes the power supply to the system through voltage regulation. It is mainly composed of small transformers, thermistors, varistors, voltage regulator chips, etc. The main components of the system are selected: MCU: ATmega64L chip of Ateml Company is selected, which is an AVR microcontroller based on high-performance, low-power 8-bit RISC structure that supports real-time simulation. With 64KB in-system programmable FLASH, 4KB on-chip SRAM, 64KB optional external storage space, 32 general-purpose registers, real-time counter (RTC), 4 flexible timer/counter (T/C) with compare mode and PWM The software to select the power saving mode,Meet the requirements for reliability and power consumption in wireless meter reading systems.

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