Design Of Remote Monitoring And Control Terminal With Visualization Function

With the development of communication technology and cloud servers,the application scenarios of Remote Terminal Units(RTU),among which industrial manufacturing is the most representative,have become more and more extensive.The industrial RTU mainly realizes the functions of data collection,data upload,equipment control,remote alarm and other functions in the industrial field.The existing remote monitoring terminal is limited to monitoring the operating status of the equipment and cannot visually monitor the operating environment of the equipment or the operators in real time.For this reason,a remote monitoring and control terminal with visualization function is designed,which realizes the organic combination of visual monitoring and traditional measurement and control relying on data transmission.The terminal is divided into two parts:visualization subsystem and industrial control interface subsystem.(1)The visualization subsystem is responsible for realizing the visualization function of the monitoring terminal.The visualization subsystem is mainly controlled by Zynq-7000 So C FPGA,embedded with the Linux operating system.The subsystem receives the video stream obtained by the camera through the USB interface,and saves the file to the local storage after video encoding.The subsystem controls various industrial control interfaces in the industrial control interface subsystem through the SPI communication interface and receives sensor data collected by the industrial control interface.Human-computer interaction is realized through the LCD touch screen.The LCD touch screen displays the video monitoring screen and sensor data and obtains the control instructions of the operator on the industrial control interface and video monitoring.The subsystem uploads the local surveillance video stream and industrial control data to the server through the Gigabit Ethernet interface.In order to improve the reliability of network transmission,this paper proposes a remote video transmission method with frame check function.(2)The industrial control interface subsystem is responsible for industrial field sensing data collection and equipment control.The industrial control interface subsystem is mainly controlled by STM32 MCU and adopts Bare Metal form to improve real-time performance.The subsystem receives the control instructions of the visualization subsystem through the SPI communication interface,and uses the switch output,analog output and other interfaces to control the execution equipment in the industrial field.The subsystem collects the sensing data of the industrial field through the switch input,analog input,RS-485 bus and other interfaces,and uploads the sensing data to the visualization subsystem.Aiming at the problem of RS-485 bus wiring polarity,a method based on the RS-485 bus polarity self-adaptation method in response to the validity of the frame.The calibration method is adopted to improve the accuracy of the industrial control interface.In order to facilitate the calibration and configuration of the system,the upper computer calibration and configuration software is designed using the Qt integrated development environment.In this design,the following tasks are completed: the drawing of remote monitoring terminal schematic diagram and PCB,component tooling welding,and prototype production.The programming of the visualization subsystem,the industrial control interface subsystem and the upper computer software is realized,and the joint debugging of hardware and software is completed.By testing the system,the remote monitoring terminal can operate normally and meet the design index requirements.