LED Screen Control System Technical Guide

1. LED screen offline LED controller is also called asynchronous LED controller or offline card: LED screen offline LED controller is mainly used to display various text, symbols and graphics or animation. The information displayed on the screen is edited by the computer, pre-installed into the frame memory of the LED screen through the RS232/485 serial port, and then displayed and played screen by screen, and the cycle goes back and forth. The display methods are colorful and varied. Its main features are: simple operation, low price and wide application range. The simple asynchronous LED controller can only display digital clock, text and special characters. In addition to the function of a simple control system, the graphic-text asynchronous LED controller has the biggest feature that it can control the content of the display screen in different regions. With the rapid development of the LED industry, the market demand for LED screen control cards is also increasing, and the wireless LED controller can well meet the needs of customers in the unified management and cluster transmission market. For example, community publicity LED screens, LED car screens, government projects, mobile, telecommunications, bank door screens, batch installation, easy management, and maintenance-free status are the best choices for users. 2. LED screen synchronous LED controller: The LED screen synchronous LED controller is mainly used to display video, graphics, notifications, etc. in real time. Mainly used for indoor or outdoor full-color LED large-screen display. The synchronous LED controller system controls the working mode of the large LED screen is basically equivalent to the monitor of the computer. It maps the images on the computer monitor in real time with at least 60 frames per second update rate, and usually has the ability to display multi-gray colors. , can achieve the effect of multimedia advertising. Its main features are: real-time, rich expressiveness, complicated operation, and high price. A set of synchronous LED screen control card system generally consists of sending card, LED receiving card, and DVI graphics card. Then, when using the control card, in order to avoid unnecessary losses, the user should pay attention to the following items: (1) Please keep the control card in a dry, relatively stable environment where the temperature, humidity, and dust are too high Many environments are extremely unfavorable to the control card. (2) When the power is not cut off, it is strictly forbidden to plug and unplug the serial port, so as not to damage the computer serial port and the control card serial port due to improper operation. (3) It is strictly forbidden to adjust the input voltage of the control card when the system is working with electricity, so as to avoid damage to the serial port of the computer and the serial port of the control card due to improper adjustment or excessive voltage. The normal operating voltage of the control card is 5V. When adjusting the power supply voltage, the control card should be removed, and the multimeter should be used to measure and adjust slowly. (4) It is strictly forbidden to short-circuit the ground terminal of the control card with the display frame, otherwise, once static electricity accumulates on the display frame, it will easily damage the computer serial port and the control card serial port, resulting in unstable communication, and the control card and screen will be burned when the static electricity is serious. display unit on the body. Therefore, when the outdoor screen or the communication distance is long, it is recommended that the user must use a serial port isolator to avoid damage to the computer serial port and the control card serial port due to harsh environments such as ground loops, surges, induced lightning strikes, and hot plugging. (5) It is necessary to ensure the correct connection between the control card and the computer serial port, so as to avoid damage to the control card serial port and the computer serial port due to incorrect input signals. (6) Do not connect the control card to the unit board. It should be directly connected to the switching power supply as much as possible, the voltage of the unit board is extremely unstable during the working process. It will cause the control card to be fast and slow at times, seriously unable to communicate or the program to run away and need to be repaired, especially the U disk control card may not be able to read the disk or read the disk incorrectly when the voltage is unstable. (7) Indoors, the 16-scan unit board should not be connected to the whole LED screen for debugging. Many indoor single-color or double-color, or even full-color, and then directly connected to the control card to power on before debugging, may burn out the row-scan driver behind the unit board in a large area. 4953 chip. For debugging, please only connect one unit board for debugging, unplug the power supply after debugging, and then connect the control card. .