Analysis of the principle of remote wireless information release system of LED display

1. Overview

The information input of traditional LED display can only be carried out by directly connecting to the computer through a data cable, which cannot meet the needs of remote information real-time release. The LED display wireless information release system can effectively solve the problem of remote networking of LED display. The system is based on GPRS wireless network technology, provides a universal LED communication control interface, and realizes large-scale networking of LED display. No matter where the LED display is placed, the main control center of the system can accurately and instantly release information to one or more designated LED display screens, greatly enhancing the flexibility of LED display screen information release.

2. Network topology of LED display wireless information release system

The wireless LED display information release system consists of LED display, LED display controller, F2103GPRSDTU and wireless LED display information release center platform. The control center uses LED display information release software, GPRS network as data transmission carrier, wireless data transmission unit and LED display controller as LED display access terminal to realize the remote sending of graphic information from the control center to the remote wireless LED display device.

3. Features of wireless LED display information release system:

(1) Large network scale: The content of traditional LED display screens is sent by computers through serial data cables, and the number of display screens is limited in scale. The wireless LED display screen information release system sends information through a variety of current GPRS control systems, using TCP/IP network transmission protocol, and the number of terminals connected to the network is not limited.

(2) Real-time information release: Traditional LED display screens can only display the information stored in the controller in a fixed manner. If new information needs to be released, it can only be updated through a computer online. Wireless LED display screens can receive information sent by the information center at any time.

(3) Not limited by distance: Traditional electronic display screens can only be used within a short distance, usually only tens of meters. Wireless LED display screens can be used throughout the country as long as the wireless GPRS network is covered, without being restricted by distance and location.

(4) Easy installation and maintenance: Since there is no need to lay optical cables or communication cables, the installation location of the wireless LED display is easy to choose. The product adopts a modular design, which is easy to maintain and repair.

4. Design principles of wireless LED display information release system

1. Advancedness: Make full use of computer Internet, mobile wireless communication system, LED display control and other advanced technologies to design a domestically advanced wireless LED display information release system. The use of the current advanced system software platform and terminal equipment can not only support the needs of wireless LED display information networking release, but also support the specific business needs of various related industries.

2. Reliability: The wireless LED display terminal can work stably and reliably, with low hardware failure rate. The communication mechanism is reliable. The use environment of wireless network communication has its own complex characteristics. The system communication mechanism must ensure efficient and reliable data transmission.

3. Scalability: The system should have good scalability, and be able to upgrade smoothly and protect investment when the number of terminals increases, the user range expands, and the system functions increase.

4. Practicality: The operation of the entire system is aimed at convenience, simplicity and efficiency. It fully reflects the characteristics of rapid response, and is convenient for operators to process and publish information, and for management to understand various statistical information in a timely manner.

5. Confidentiality: Strict authority management is implemented for the management of the system. Only keys with certain authority can access, monitor, and implement corresponding management and control operations to ensure the safety and reliability of the system.

5. Main functions of wireless LED display information release system

1. The system supports a maximum of more than 10,000 wireless LED display screens;

2. Communication system support: GPRS/CDMA and other wireless communication methods, short message communication methods;

3. The system software adopts B/S structure;

4. Support LED display device information management function;

5. Support real-time and scheduled text message sending;

6. Functions of adding, deleting, editing and modifying published information;

7. Define different operation permissions for different operation users to achieve hierarchical user management.

6. Business Process

The process of GPRS private network system terminal logging into the server platform is as follows:

1. The user sends a GPRS login request, which includes the private network APN specially allocated by the mobile company for the GPRS private network system;

2. Based on the APN in the request, the SGSN sends a query request to the DNS server, finds the GGSN connected to the enterprise server platform, and encapsulates the user request through the GTP tunnel and sends it to the GGSN;

3. GGSN sends the user authentication information (including mobile phone number, user account, password, etc.) to Radius for authentication via a dedicated line;

4. The Radius authentication server sees the authentication information such as the mobile phone number, confirms that the request is from a legitimate user, and requests the DHCP server to allocate a user address;

5. After Radius authentication is passed, Radius sends a confirmation message carrying the user address to GGSN;

6. Once the user obtains the IP address, he can carry data packets and access the GPRS private network system information query and business processing platform.