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LED Control Card Basic Knowledge

  LED Display control card is the core component of LED display screen.The LED Display control card is responsible for receiving the display information from the computer serial port, which is divided into synchronous led control card and asynchronous led control card.
  
  1. Synchronous LED Control Card:
  
  Mainly used in real-time display video, text, notice and so on. Mainly used in indoor or outdoor LED large screen . Synchronous LED control card system control LED display mode is basically equivalent to the computer monitor, it is at least 60 frames/sec Update rate point corresponding to real-time mapping of the computer monitor image, usually has many gray color display ability, can achieve multimedia advertising effect. Its main features are: real-time, expressive, complex operation, high price.A set of synchronous LED Display control card system is generally composed of sending card, receiving card, and DVI video card.
  
  2, Asynchronous LED control card:
  
  Mainly used to display a variety of text, symbols and graphics or animation-oriented. Screen display information by the computer editor, the rs232/485 serial port preset into the LED display frame memory, and then screen display playback, cycle, display way colorful, varied. Its main features are: simple operation, low price, wide use. Simple asynchronous led control card can only display digital clock, text, special characters.
  
  In addition to the function of simple control system, the main feature of the graphic asynchronous led control card is that it can control the display screen content in the region. With the rapid development of LED industry, LED display control card market demand space is also increasing, and wireless led control card can be very good to meet the customer unified management, cluster sent market demand.
  
  For example, the community propaganda led screen, car screen, government projects, mobile, telecommunications, bank door Head screen, batch installation, easy management, to achieve a state without maintenance, is the best choice for users.
  
  So when using the control card, in order to avoid unnecessary losses, should pay attention to the following matters:
  
  1, control Card please keep working in a dry, relatively stable environment, high temperature, and humidity, and dusty environment, the control card is extremely unfavorable.
  
  2, in the absence of power, do not plug the serial port, lest due to improper operation and damage the computer serial port and control card serial port.
  
  3, in the system of live work is strictly prohibited to adjust the control card input voltage, lest due to improper adjustment, high voltage and damage the computer serial port and control card serial port. The normal operating voltage of the control card is 5 v.When adjusting the power supply voltage, the control card should be removed and measured with a multimeter for slow adjustment.
  
  4, forbid the control card grounding end and the display frame short connection, otherwise the display frame once gathers static electricity, extremely easy to damage the computer serial port and the control card serial port, causes the communication to be unstable, the static electricity serious will burn out the control card and the screen body display unit.Therefore, in the outdoor screen or communication distance is far away, we recommend that users must use a serial isolator to avoid the ground circuit, surge, induction lightning, hot Plug and other harsh environment on the computer serial and control card serial port damage.
  
  5, must guarantee the control card and the computer serial port correct connection, lest because of the input signal incorrect and the damage control card serial port and the computer serial port.
  
  6, the control card is not connected to the Unit board. As far as possible direct to the switching power supply, the unit plate in the operating process voltage and instability.will cause the control card when fast slow, serious can not communicate or program to run the need to repair, especially U disk control card, in the case of voltage instability may not be able to read disk or read disk error.
  
  7, 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 did not debug the state directly connected to the control card on the electricity, it is possible to burn a large area behind the unit plate sweep drive 4953 chip. debugging, please only one unit board debugging, debugging finished unplug power, and then connect the control card.

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