The design of a remote monitoring system for agricultural vegetable bases using MCGS and DTU is proposed. This scheme collects temperature, humidity, light, gas concentration and other parameters of the on-site environment of each agricultural base through sensors, and transmits them to the data collection and display terminal at the base. The display interface of the terminal is based on the secondary development of MCGS configuration software. This system proposes to use DTU for remote communication and GPRS network as the transmission channel to realize communication between PC and Kunlun MCGS, remotely monitor the environmental parameters of each agricultural base, and realize the exchange of remote information between equipment and bases. It mainly introduces the overall structure of the system, and describes in detail the design ideas of the host computer MCGS and the communication principle and design process of the DTU.
At present, my country’s agriculture is transforming from small-scale individual planting to intensive large-scale base planting, and various problems are becoming increasingly apparent, such as irrigation problems, ventilation problems, lighting problems, etc. In order to solve this problem, an agricultural safety monitoring system that relies on computers and is based on modern communication technology must be developed to achieve a high-efficiency, information-based management model [1]. The remote monitoring system introduced in this study mainly completes the monitoring of vegetable bases and realizes modern management such as real-time collection of on-site environmental parameters, alarms, and data archiving. This system applies the most advanced DTU/GPRS wireless network technology to the communication between PC and Kunlun MCGS, so that the environmental parameters of remote monitoring objects (temperature and humidity, illumination, gas concentration and other data as well as alarm signals) can be transmitted wirelessly through GPRS The method is transmitted to the information management center in real time, enabling remote monitoring of greenhouses in several different locations at the same time on the computer in the control center. At the same time, the computer in the information management center communicates wirelessly through DTU, and the DTU is connected to the Kunlun touch screen through the serial port. Based on the corresponding alarm information, the management center sends control commands to the base on-site data collection and display terminal to perform corresponding control operations [2 ].
1 System design
The entire remote monitoring system is mainly divided into the collection of on-site environmental data of the vegetable base, the monitoring and communication of base on-site data collection and display terminals, and the monitoring design of the information management center. The data collection layer is mainly responsible for the collection and transmission of environmental parameters of each base. The RS-485 bus forms the underlying network on site. The system structure is shown in Figure 1. The software used in the base’s on-site data collection and display terminal is the embedded version of the industrial control configuration software MCGS77. The designed project is downloaded to the base’s on-site data collection and display terminal touch screen (Kunlun Tongtai TPC7062KX), and then connected to the sensor. To realize the collection of environmental parameters, users can set the upper and lower limits of various environmental parameters according to crop growth needs, and perform intelligent control. Moreover, compared with using VC or VB to write the host computer monitoring program yourself, the development cycle is shorter and the monitoring interface can be quickly generated. The main features of MCGS are: (1) Powerful network function. Supports Ethernet TCP/IP communication, serial port communication, and Modem serial port communication, which can realize remote data transmission conveniently and quickly. (2) Real-time database is the core of the entire system. Each component performs data input and output with the real-time database and effectively detects errors existing in the data. (3) Can support multiple hardware devices at the same time. With the real-time database as the center, the components corresponding to each device establish independent relationships with it, and the system will not be affected by changes in one of them [3].
The remote monitoring layer is mainly based on TCP/IP protocol and uses B/S mode to complete the remote monitoring function. Remote clients can log in to the browser, enter the designed remote interface, and intuitively observe the growth status of plants in each greenhouse by obtaining video images from cameras. They can also objectively analyze real-time conditions through the display of relevant environmental parameters, and can also analyze the real-time conditions based on historical data. Perform relevant analysis on data and perform relevant operations.