Problems to be paid attention to in the application of 4G DTU in the intelligent meter reading system

The intelligent meter reading system is a system that integrates automatic collection, transmission, processing and real-time monitoring of electricity consumption information. With the system put into operation, meter readers only need to sit in the office, and can complete meter reading and data entry with a single click of the mouse. At the same time, remote monitoring can be realized to detect abnormal electricity consumption in time.

In modern building construction, many electric meters have been placed together. These electric meters have built-in single-chip microcomputers, which can read the actual electricity consumption data through the single-chip microcomputers, and can communicate with the outside through the RS-485 communication method. Using the RS-485 communication capability of Jrepus JD816 IP MODEM, connect it in parallel with the meter, and realize the connection with the mobile network and the meter reading data service center through JD816, so that the meter reading data service center can directly access each Meter, to achieve a remote meter reading system.

technology deployment

The whole system includes two parts: the front-end acquisition and transmission part, the central data storage and processing display part;

Collection and transmission: mainly including smart meters, wireless DTUs, equipment protection boxes, etc. The meter data is mainly collected by the DTU, and the data is transmitted to the central server through a wireless network such as GPRS/CDMA/3G;

Data storage and processing display: mainly includes data server, application server, monitoring large screen and other parts. Mainly responsible for storing, analyzing, and displaying the data returned by the front-end collection.

Several main issues considered in the design of 4G DTU wireless meter reading system:

Meter selection 

With the application of electronic technology and single-chip microcomputer technology in electric meters, intelligent electric meters have emerged, which can be roughly divided into two types: electromechanical with microprocessor and all-electronic. The electromechanical type uses the movement of the original induction type watt-hour meter to measure the user's power consumption by reading the number of revolutions of the turntable through the photoelectric sensor, such as magnetic card type watt-hour meter, electric card type watt-hour meter, IC card watt-hour meter, etc.; while the all-electronic watt-hour meter The meter adopts the voltage and current isolation method to perform A/D conversion, multiply the sampled values ​​and calculate the user's power consumption cumulatively. Electromechanical smart meters are low in cost and are mainly used for single-phase watt-hour meters, which are suitable for residential users. All-electronic meters are mainly used for three-phase electricity billing and are aimed at enterprise applications. In order to realize remote automatic wireless meter reading, a smart meter with a communication interface should be selected, usually with several interface forms such as RS-485, RS-232, CAN bus transceiver or infrared.

Way of communication

The core of the 4G DTU remote wireless meter reading terminal is to use computer network and communication technology to automatically count the electricity consumption of each user through the 4G wireless network, and send it to the remote monitoring center to realize automatic meter reading. Here we focus on the meter reading method of 4G wireless network transmission.

The 4G wireless communication method is not limited by time and region. As long as the mobile network can cover the area, the time wireless meter reading can be performed. At the same time, the Jrepus 4G DTU wireless meter reading module can also maintain a long-term online status. The management center can use the computer at any time. Get accurate data from the meter.

Wireless transmission module (4G DTU)

In the remote wireless meter reading system with a tree network structure, the Jrepus 4G DTU wireless transmission module is equivalent to an intelligent management machine.

Its main functions: one is to collect and process the data (such as the number of electric meters and the state of the electric meter) of each electric meter, and then transmit the data from the data adapter to the central station through the communication medium according to the requirements of the central station. The second is to be able to store the address of the associated watt-hour meter according to the command of the central station, and to set the important parameters of the associated watt-hour meter (such as the constant of the meter and the base number of the meter); the third is to have a networking function and be able to communicate with multiple meters Point-to-point or point-to-multipoint signal communication and data transmission.