As a brand-new information medium, LED display has outstanding advantages in performance. Its long service life, fast response speed, simple drive and stable performance make it widely used in various fields of society. For example, highways use LED displays to publish road condition information in real time; stadiums use LED displays to publish live conditions in real time, and so on. How is this real-time information released to the scene quickly?
Outdoor led display
Figure 1 Outdoor LED display
At present, the data transmission of outdoor LED display can be through the following methods:
The staff uses a portable computer to update the data at the equipment site. The disadvantage is that it is difficult to update the display data in real time, and it is difficult to find the faults of the LED display in time. It also increases the labor intensity of the staff and increases the labor cost of the operation of the enterprise.
The LED display screen is connected to the Internet through the Ethernet line to communicate with the server-side computer connected to the Internet, and the computer is used to transmit data to the LED display screen through the Internet. This method requires Ethernet wiring, which has disadvantages such as inconvenient installation and expensive maintenance.
Realize the control of LED display screen through short message. The disadvantage of this data transmission method is that it is difficult to edit short messages and the amount of transmitted data is relatively small. At the same time, there is a certain time delay in the transmission of short messages, and it is difficult to guarantee the real-time performance of the data, especially in the occasions where the information needs to be displayed in real time, such as road traffic and stadiums.
Control the LED display screen through the mobile communication network. The advantage of this data transmission method is that the installation is simple, the speed is relatively fast, and it is not limited by time and space, and can update the display data in real time. Therefore, the use of mobile communication network has become an ideal choice.
The system for remote control of LED display based on GPRS network is shown in the figure. The system consists of LED display, GPRS DTU, upper computer server software, etc. In this solution, the only requirement for the LED display controller is that it needs to have an RS-232 or RS-485 communication interface.
Outdoor led display
ZWG-20IE is a wireless data transmission equipment (DTU) based on GPRS network, providing users with high-speed, fully transparent data channel, simple to use, stable and reliable equipment, at the same time ZWG-20IE has a large buffer area design, using dynamic division Technology to meet the transmission requirements of different data volumes.
Outdoor led display
GPRS wireless data transmission equipment is used for data transmission through the Internet, and the host computer server of the LED display needs to be connected to the Internet to communicate with the GPRS wireless data transmission equipment. The host computer server can be connected to the Internet by using static IP or dynamic domain name, etc. If the host computer server of the LED display is in the local area network, it is necessary to perform port mapping operation on the router.
In this application, ZWG-20IE is used as the client of the network device, and the upper computer software that controls the LED display is used as the server. The upper computer software can communicate with the client through standard socket network programming.
Outdoor led display
Generally speaking, manufacturers who produce LED display controllers will provide a host computer software based on the RS-232 interface. The host computer software communicates with the LED display controller through a serial port. In view of this, we provide a virtual serial port software that directly ZWG-20IE is virtualized as a "wireless serial port", and users can use it directly without modifying the existing host computer software based on the RS-232 interface.
