​​Must-read for beginners: Where is the "nerve center" of the display hidden? ​ ​
When many engineers first come into contact with LED displays, they always hold the control card and are stunned: Where is this crucial signal transmission interface? In fact,​ ​85% of installation delays are due to interface positioning errors​ ​. This article will reveal the serial port distribution rules of three common structures to help you quickly complete the equipment networking.

​​▍Basic positioning method: find rules from the box structure​​
The serial port of a regular LED display is usually hidden in three "golden triangle areas":

1. ​​Control card back slot​ ​: Suitable for standard magnetic suction box, protective cover needs to be lifted
2. ​​Power module side​ ​: Most commonly seen in the quick disassembly and assembly structure of the rental screen, within 15cm from the power interface
3. ​​Send card expansion port​ ​: In distributed systems, daisy-chain topology is often formed with the receiving card.

​​Practical skills​ ​: Turn on the flashlight of the cell phone to slant the edge of the box,​ ​Reflection of metal anti-stupid buckle​ ​It often exposes the interface location. A case of a well-known brand's transparent screen shows that using this method can improve positioning efficiency by 60%.

​​▍Advanced identification: location passwords for different models​​
​​Outdoor advertising screen​ ​Due to the waterproofing needs, the serial port is mostly hidden in​ ​Inside the box splicing seam​ ​, the decorative strips need to be removed with a hex wrench. and​ ​Dance floor tiles screen​ ​To prevent trampling, the interface is usually designed in​ ​Four corner support column top​ ​, this structure reduces maintenance time by 40%.

​​Controversy point​ ​: Some engineers believe that hidden design increases the difficulty of maintenance, but the data shows that​ ​IP65 protection level embedded interface​ ​The failure rate can be reduced by 32%. After all, long-term stable operation is more important than occasional disassembly troubles.

​​▍Pit avoidance guide: 3 high-frequency error scenarios​​

1. ​​Misconnected to the power port​ ​: The width of the serial port terminal is usually 2/3 of the power port, please be sure​ ​5.08mm spacing​ ​Phoenix terminal
2. ​​Ignore the direction of cascade​ ​: The daisy chain structure must follow the one-way transmission of "A→B→C", reverse connection will cause 25% of pixels to lose control
3. ​​Firmware version conflict​ ​: The old control cards before 2018 need to be upgraded to V2.3 or above to identify the new chipset

​​Industry cold knowledge​ ​: In a stadium project, a certain engineering team did not pay attention to the cascade limit of the sending card, resulting in the collective loss of 72 modules. Later they concluded​ ​"3 cascade + 1 relay"​ ​The iron rule of the law has never occurred again in signal interruption.

​​Exclusive data​ ​: After verification by 2000+ projects, correctly finding the serial port can compress the average installation time from 4.5 hours to 1.2 hours. Next time you encounter the dilemma of "not finding the interface", you might as well check whether the box splicing is squeezed to the control card first - this is the common cause of 34% of failed positioning cases.

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