Design and implementation of distributed monitorin

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Design and implementation of large warehouse distributed monitoring and management system 

this paper introduces the design and implementation method of a distributed warehouse monitoring and management system. The system uses the current computer and network technology to realize the intellectualization, distribution and networking of warehouse monitoring and management. Any computer connected to the monitoring host on the network can be used as a monitoring workstation for remote monitoring. At the same time, the monitoring information can be published remotely through the computer network. Different from the traditional anti-theft alarm system, this system organically combines the delivery of warehouse keys, warehousing, card machine management, alarm processing, image monitoring, duty management, voice intercom, warehouse environment monitoring, data query and statistics, and makes full use of data, voice, image and other media, so that commanders can quickly understand the situation and make correct decisions in the shortest time, The automatic management and command level of the warehouse are improved to the greatest extent. The system comprehensively uses computer network technology, digital image processing technology and database technology, and has made breakthroughs in many aspects, such as the function and performance of the monitoring system, system scalability, system scalability, maintainability, as well as the reliability and stability of the system

1 system structure

the biggest feature of this system is to make full use of current computer and network technology to realize the distribution and networking of monitoring management. The system structure is shown in Figure 1

as shown in Figure 1, the whole system is composed of two parts. One part is composed of WWW (World Wide Web) server, DB (database) server, video server, monitoring host (industrial computer), monitoring workstation and router. Three kinds of 2D materials similar to graphene have been paid attention to: 1 is the 2D silicon computer network monitoring subsystem; The other part is the hardware subsystem of on-site measurement and control, anti-theft alarm, voice intercom and image monitoring, which is composed of on-site control unit, near end hub, matrix switch, etc. The monitoring host and the near end hub connect the two parts through the serial port. RS-485 is used to connect the near end hub and the field monitoring unit. Each near end hub can be connected with 64 field control units (that is, 64 monitoring sites), and the field control unit is connected with the field data acquisition and control equipment. Because the warehouse is located in the mountainous area and the site situation is complex, the 485 communication module and the circuit all adopt photoelectric isolation, lightning arresters are installed on the data line, video line and power line, and lightning arresters are installed and grounded for all equipment power supplies, realizing the requirements of lightning protection of the system

in the computer network monitoring subsystem, the monitoring workstation processes the monitoring information, and the human-computer interface is intuitive and easy to use, which is very convenient to use. The monitoring host realizes the monitoring agent function. On the one hand, it acts as an agent for the monitoring and management request of the monitoring workstation in the local area. On the other hand, it also responds to the query of the superior monitoring management center and the remote control of the equipment at the time of application. At the same time, it reports the warehouse status information and equipment fault information to the monitoring workstation and the superior monitoring to help equip the measurement management center. The monitoring host is equipped with a sound card to realize the voice intercom between the monitoring center and the monitoring site, and the video server is equipped with a video acquisition card to receive the image output of the matrix switcher and publish it upward. Web servers (WWW, DB) are responsible for the storage and release of monitoring information

contact information show contact (please contact us for exhibiting and visiting matters) this architecture has good scalability, and can easily add, delete and modify the monitoring site according to the actual situation. At the same time, the system has a flexible network control and management function. Any computer on the network can be used as a monitoring workstation for remote monitoring. Through the master-slave mechanism set in the system, multiple monitoring workstations can work in coordination. At the same time, through the router, multiple monitoring and management centers can be connected into a larger and even nationwide monitoring and management network, realizing the hierarchy, networking and distribution of monitoring and management

2 system hardware composition and design

system hardware mainly includes near end hub, on-site monitoring system, card and voice intercom system, image transmission system, etc., which are introduced below

2.1 near end hub

near end hub is an intelligent processing device with single chip microcomputer as the core. It is a bridge connecting the monitoring host and the field control unit. Various commands of the monitoring workstation are sent to the designated field control unit through the near end hub, and various messages of the field control unit are reported to the monitoring host through the near end hub. The near end hub uses the query method to check whether each on-site monitoring unit has an event reported, and when it is idle, it sends up the device diagnostic information. The communication rate between the near end hub, the field monitoring unit and the monitoring host is 9.6kbps

in addition to a serial port connected to the monitoring host, the near end hub is also designed with five RS-485 ports, one of which is used to assign a number to the field monitoring unit (each field monitoring unit must be assigned a unique number before use, which we call equipment number, and registered in the system. In fact, the near end hub also has its own equipment number, which is also assigned by the system software), The other four 485 ports are used to connect the field monitoring unit. Each 485 port can connect up to 16 field monitoring units (bus connection), and the longest transmission distance can reach 1.2km. In this way, a near end hub can connect up to 64 field monitoring units. By using the near end hub, the scalability of the system becomes very good

2.2 on site monitoring equipment

the on-site monitoring system is composed of on-site monitoring unit and on-site data acquisition and control equipment, such as card machine, door magnet, double inspection, temperature and humidity sensor, voice alarm, etc., which mainly completes the transformation, acquisition, control and other functions of various signals. The on-site monitoring unit is also an intelligent control device with a single chip microcomputer as the core. It receives and controls the control commands sent by the near end hub, such as controlling the feeding of the electric lock, opening the alarm, etc. at the same time, it can report various events, such as alarm, card touching, equipment diagnostic events (such as card machine does not work), etc

2.3 card machine

card machine is an intelligent IC card reading and writing device, which has upper and lower contacts and is connected to a 485 port of the field monitoring unit. In addition to the IC card reading and writing control, the card machine also has built-in headphones, microphones and other voice circuits, which can carry out voice intercom. In the system, the functions of the upper and lower contacts of the card machine are defined differently. When the card touches the contact, it can open the warehouse, be on duty, report fire alarm, etc., and when it touches the contact, it can talk back and report theft alarm

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