In the past two years, the LED display has developed rapidly, and the LED control card market has become more extensive. Although the current market homogenization, price war, and low innovation power have brought certain negative impacts on the market, under the influence of the market environment, LED control cards still have a lot of room for development. The wireless LED control card meets the needs of the unified management of the customer and the market sent by the cluster. For example, the community publicity LED screen, car screen, government projects, mobile, telecommunications, bank door screen, batch installation, easy management, to achieve a state without maintenance, is the user's best choice. In order to avoid unnecessary losses when using the control card, we remind users to pay attention to the following points: 1. It is forbidden to plug and unplug the serial port with power to avoid damage to the serial port of the computer and the serial port of the control card due to improper operation. 2. It is forbidden to adjust the input voltage of the control card when the system is live, so as to avoid damage to the serial port of the computer and the serial port of the control card due to improper adjustment and high voltage. The normal working voltage of the control card is 5V. When adjusting the power supply voltage, the control card should be removed and measured slowly with a multimeter. 3. It is strictly forbidden to short the grounding end of the control card and the display frame. Otherwise, if the static electricity is collected on the display frame, it will easily damage the serial port of the computer and the serial port of the control card, resulting in unstable communication. When the static electricity is serious, the control card and the screen will be burned out. Display unit on. Therefore, when the outdoor screen or communication distance is far away, it is recommended that the user must use the serial port isolator to avoid damage to the serial port of the computer and the serial port of the control card due to harsh environments such as ground loop, surge, inductive lightning strike, and hot swap. 4. The correct connection between the control card and the serial port of the computer must be ensured to avoid damage to the serial port of the control card and the serial port of the computer due to incorrect input signals. 5. Do not connect the control card to the unit board. Should be directly led to the switching power supply, the voltage of the cell board during operation is unstable. Will cause the control card to be fast and slow, serious communication can not be communicated or the program needs to be repaired, especially the U disk control card, in the case of unstable voltage, it may not be able to read the disk or read the disk error. 6, indoor, 16 sweep unit board should not be connected to the whole screen debugging, many indoor monochrome or two-color, or even full color, and then un-commissioned state directly connected to the control card power, it is possible to burn out the unit board behind the sweep drive 4953 chip . Please debug only one unit board for debugging, unplug the power supply after debugging, and then connect the control card. 7. Control card Please keep working in a dry, relatively stable environment, too high temperature, humidity, and dusty environment, which is extremely unfavorable to the control card. Circulator Waveguide/Coaxial/Tab Microwave Circulator,Isolator And Circulator,High Power Rf Circulator,Rf Waveguide Circulator Chengdu Zysen Technology Co., Ltd. , https://www.zysenmw.com