Led display application system solution
Release date: 2017-11-21 Source: Foreign station sharing: 
Chapter 1 Application System Design
1.1.1 System function
For different functions, the system can provide multi-level business support. The system design mainly includes 15 main functional modules such as inducing screen release, real-time road traffic release, and traffic event release. The main functions of each functional module and the business processes implemented are as follows:
Function category | Sub-function requirement | Functional description |
Traffic guidance software | Information processing release module | According to the preset template, the traffic information of each point and the road traffic condition are detected, and the traffic state information that can be used for display on the display screen is generated and written into the database by using the link state information in the database. The information publishing function can provide a variety of information publishing methods, and can merge artificial and automatic publishing (including external systems) induction information into unified information. |
Security management module | Adopt data encryption, transmission encryption, access control and other technical means, and adopt complete security measures to ensure system security. Group the functions of the system, different user groups have different access rights. For different users, the corresponding system control authority is obtained according to the group to which he belongs. Only the most advanced users have the right to assign permissions to other users. | |
System maintenance module | The maintenance management module runs on the primary server and automatically adjusts and tiers alarms if an abnormality is found. The system has a logging function that records the user login status, information displayed on the display, manual modification of information, etc., and archives on disk. Log records are automatically retained, and archived historical data can be dumped, viewed, and printed if necessary. The transmission interface circuit takes protective measures to protect the transmission interface of the LED display from the surge voltage generated in the line. | |
Interface conversion module | The interface conversion module runs on the main server and runs software for the background for connection with other systems. Use different interface conversion modules for connections to different systems. The interface conversion module reads the working state of the display screen from the communication management software and sends it to other systems, receives control commands for the display screen from other systems, and forwards them to the corresponding communication management software. | |
Communication management module | The communication management module runs on the control server and its main function is to interpret the communication protocol of the variable information flag. VMS communication protocols generally only need to implement the physical layer, data link layer and application layer three-layer protocol. | |
Calculation software module | The calculation software module mainly includes a software calculation unit involved in the whole process from raw data processing to information release, including an information processing sub-module and a scheme generation sub-module. | |
Configuration management and monitoring module | Provide a visual interface to assist system users to complete configuration management of related static information, such as user information, computer information, device information addition, modification, and deletion operations. At the same time, display parameter configuration can be realized, including system or manual lighting display, setting cabinet information, performance parameter adjustment, parameter curing, configuration file saving and loading, display brightness adjustment (including manual adjustment, automatic adjustment, timing adjustment). ), centralized monitoring (including remote monitoring of the display's working status, temperature, humidity, smoke, power, cabinet and door status, and timely feedback to the center, notify users of equipment failure by mail), remote display correction, Coefficient management, power management, manual or automatic turn-on, turn off the display power, etc. |
Overall function
1.1.1.1 Basic functions
The following general basic functions are generally met:
——The display is a completely outdoor environment. The equipment room is used in the computer room environment. The business requirements system must be operated 24 hours a day. The system and all equipment can run continuously 24 hours a day in the actual use environment.
——The equipment and system design reflects the advanced technology and keeps it behind for a certain period of time. The main equipment (display, control, communication equipment, etc.) can guarantee the normal service life of 5 years.
- All equipment is new, unused, and functional and performance indicators are consistent with the supplied product specifications.
Information release function
The core function of the system is to release traffic guidance information, and the following three information distribution methods can be provided on the information release function:
——Curing information display: The general display information is solidified in the lower display for display when the display and the center are interrupted. The curing information can be downloaded from the control center or downloaded from a notebook. The information content and display time can be changed by the control system.
- Artificially induced display: The induced information is manually sent to the outdoor display through the control system. It can be set to display or set immediately after sending, and the display will be sent by the control system at regular intervals.
——Automatic induction display: The induction software automatically generates and generates the induction information according to the preset algorithm according to the real-time traffic flow data collected by the traffic flow real-time dynamic information detection system, and the generated induction information is automatically sent to the outdoor display after confirmation. Screen display.
control function
Due to the characteristics of the induced information outdoor display, the system control must be strictly and effectively, whether from system management or business specification management and social integration factors. The specific control functions include:
——The traffic guidance outdoor information display is controlled by the main command center, the sub-command center and the on-site three-level control. Under normal circumstances, it is directly controlled by the main command center. The time-division command center can directly send and display relevant information. In special cases, the notebook can be used in the field. Computer to control. Information publishing permissions can be set by the system as needed.
——When the communication connection between the outdoor display and the command (minute) center is interrupted, the display can automatically display the stored information and display only the general information, and can use the laptop to operate and control the information display in the field.
1.1.1.2 System Control Management Software Functions
Traffic guidance information release system, due to the particularity of use, should have a variety of management and maintenance functions, including system monitoring and control functions, system self-diagnosis function, system fault protection function, system security management function, system automatic alarm function.
System monitoring and control functions
The system has the following monitoring and control features:
——It can be directly managed by viewing the display map, and the operation is intuitive;
——In the control room, the power switch can be completed and the remote control operation can be reset on the display screen;
——You can check the status of the power switch of any screen, group of screens and all screens at any time;
——Check the status of any display screen in the control room: including online, offline, display, power switch, communication status (normal, abnormal, etc.), display content, etc.
- You can pre-set to send relevant information to the specified display.
System self-diagnosis function
The host checks and reports the working status of the communication port during work. The display can detect and report whether the work is normal through the self-test program. The test content includes:
——Power detection: automatically detect and report the status of the display module power supply;
——Drive detection: automatically detect and report the working status of the display drive circuit;
——Communication detection: Automatically detect and report the communication status between the main controller of the display and the display cabinet.
System failure protection
The control panel and each display are made of high quality components and take necessary protective measures to improve the resistance of the equipment to strong electromagnetic interference and lightning strikes. The transmission interface circuit takes protective measures to protect the transmission interface of the LED display from the surge voltage generated in the line.
1.1.1.3 Overall function of the outdoor display
——All equipment should be able to run continuously 24 hours a day under the conditions stipulated by this design, and can work in all kinds of bad weather such as wind, rain, snow, fog, sand and dust in Beijing for four seasons.
——The display screen or display module has the inspection report issued by the provincial (city) and ministerial level electronic product quality supervision agencies.
——Meet the power supply condition: AC 220V±15% 50±2Hz
——Meet the ambient temperature: -20～+60 °C
- Environment meets humidity: 10%-95%RH
——The screen body is equipped with lightning protection devices, and each lead-in line has adopted corresponding lightning protection measures. The equipment must have good anti-interference and lightning surge protection characteristics, and the electrical pulse interference protection and electrostatic interference protection reach IEC801 level 3 or higher.
——The metal components are well grounded, the working grounding and lightning protection grounding are shared, and the grounding resistance is ≤4Ω.
——The product components such as column, frame, support frame, display box and controller box should be installed firmly, the structure is stable, the corner transition is smooth, no flash, no burr. Various fixed bolts, meet in Beijing temperature, wind, rain, snow, road vibration and other outdoor environment.
- Can withstand wind speeds of 40m / s.
——The illuminating pixels of the display screen emit light evenly without mosaic phenomenon.
——In order to ensure that the display can work continuously for 24 hours under outdoor conditions, the circuit board and the like are subjected to the necessary waterproof, moisture-proof and anti-corrosion treatment.
——The installation of the outdoor display box and the controller box is firm and correct, the position is correct, the components are complete, the outlet pipe and the box are well sealed, and the connection between the boxes should not be exposed.
——The visibility of the characters and graphics displayed on the display screen is in full compliance with the requirements of the traffic marking line GB5768-1999.
-- The display can accept both central and local control.
——The display provides one RS-232/422 serial communication interface and one Ethernet interface, and another RS-232/422 serial communication interface or one Ethernet interface for on-site maintenance and control.
——The brightness of the display can be adjusted automatically according to the brightness of the environment. It can also be manually adjusted remotely. The adjustment range is not less than 32 levels. When it is brightened, it can clearly recognize the display content within the specified distance under the conditions of direct sunlight in the daytime display; when dimming, there is no glare at night.
——The center can remotely control the display to display the power switch (hard off screen); can remotely control the display display on and off (soft off screen); remote control display reset.
——When the temperature inside the display box is higher than the set value T1 (T1 can be set remotely), the fan will be automatically turned on. When the temperature inside the display box is lower than the set value T1, the fan will be automatically turned off; the temperature inside the box is higher than the set value. T2 (T2 can be set remotely, T2 is higher than T1) should automatically turn off the display screen power and automatically upload the fault status to the main (sub) center.
——With display status self-test function , it can automatically detect whether the display content is correctly displayed on the display. When a fault occurs, the display is automatically turned off and the fault status record is uploaded to the command center.
——With automatic monitoring and reporting the working status and fault information of each equipment unit in the display, the control box body has the function of opening the door alarm.
——When the power module fails, the entire display can be automatically turned off, showing a black screen status without any bright spots. At the same time, the fault information is automatically reported to the center. After the power is restored, the device automatically accepts the commands from the control center computer and switches to normal operation without manual reset.
- When the communication is interrupted for more than 180 seconds, the curing information is displayed. After the communication is restored, the device automatically accepts the command from the control center computer and transfers to normal operation without manual reset.
Label: led display application system solution
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