Realization of Real-time Storage of Instrumentation Monitoring Data and Implementation of Long-distance Regular Transmission

With the development of network and information technology, serial monitoring devices originally managed by serial ports, RS232, and RS485 no longer adapt to the pace of informatization. Remote data over GPRS wireless networks facilitates the development of modern monitoring systems.

Due to the decentralized monitoring sites and the wide distribution range, most of them are set up in areas with relatively harsh environments. Data transmission via the GPRS wireless network has become one of the communication means for our monitoring data to be sent to the back-end server of the management center in real time for processing. However, in some specific applications, data does not need to be processed and displayed in real time, but the original data is recorded and used as a "black box" to prepare for back-end processing. At the same time, the problem of data loss or delay caused by the instability of the GPRS network cannot be avoided. As a professional embedded application developer and solution provider, Guangzhou Lecheng Electronic Technology Co., Ltd. provides cost-effective system design to meet the different needs of industry users, helping users to achieve optimal real-time data storage and data transmission at regular intervals. solution.

System composition and basic working principle

To achieve high reliability and high efficiency of the system, a high-performance 32-bit embedded microprocessor based on the ARM architecture is used as the management core of the system, and a unique dynamic memory allocation algorithm is used in combination with an efficient embedded operating system. In this way, the memory consumption and release of the file system are managed, the data transmission efficiency is improved, data loss is avoided, reliable storage of monitoring data and complete transmission of data are realized.

The data storage system adopts a modular design, which is small in size and facilitates system expansion. Users do not need to retrofit any existing equipment directly between the data monitoring and collection equipment and the GPRS data transmission DTU, and can realize real-time storage of monitoring data. Meanwhile, the remote PC terminal can use GPRS data transmission DTU to large capacity. System files in the memory card are accessed and managed.

Software Implementation

In the process of real-time data transmission using GPRS data transmission DTU, data loss due to network instability is unavoidable, which brings great inconvenience to the data processing and analysis of the user's back-end server. The data storage system stores the data of the data monitoring device in a time-divided manner, and stores the data of each time period in different storage files. The storage file is in the format of "0001.TXT, 0002.TXT...", and is automatically numbered. cover. Each period can be set to automatically create a storage file every hour, day, or month. The monitored data is completely stored in the memory card, which serves as a backup of the original data and can be used as a “black box”. When the user needs to extract data, it can not only directly read to the site, but also can remotely manage the file system in the memory card through the GPRS wireless data transmission device.

The remote PC terminal can perform operations such as reading, deleting, and creating the data storage file in the memory card through the instruction.

The real-time data of the system can be read regularly by the terminal PC, which greatly reduces the cost of data traffic generated by using the GPRS network; it reduces the cost of system operation and reduces the operating cost of the system. More information Baidu "LCA Data Logger"

Hardware interface design

a Provides dual RS232/485 interface, supports 2400~115200 wide range baud rate. Transparent serial port data transmission, no transmission protocol, transparent storage of user data, 100% reliable, support data storage and transmission capacity up to 14K bytes/sec.

b has USB copy data function, U disk management, high speed USB2.0 interface; USB automatic identification, no need to install the driver.

C has low power consumption and supports lithium battery power supply; it is easy to carry and adapts to work in harsh outdoor environments.

Shock-resistant design: whether it is in the storage pipeline online detection data, or unmanned aerial information black box need data storage equipment has a certain strength of vibration resistance, this hardware design uses self-locking card holder, embedded memory card, Has a shockproof function; to avoid accidental contact between the memory card and the card holder, resulting in data can not be stored.

Buzzer alarm function: For important data, the loss caused by lost data is painful. The system software has designed a system error alarm. After the system is powered on, the SD/TF card is initialized. The buzzer sounds when the initialization is successful, indicating that the system is operating normally; the buzzer sounds long as an error alarm.

typical application:

Widely used in petrochemical, power monitoring, environmental monitoring, natural disaster monitoring, marine monitoring data logging, meteorological data collection, hydrological data logging, GPS acquisition data, aerial photography, track record, vehicle black box, industrial monitoring field data, various Sensor data records, monitoring voice records and other important data post-processing applications.