Ouch hey! When I first entered the industry, I was also confused by this problem - I clearly looked at the display screen as big as a palm, why can't I find the serial port? Last year, a commercial street in Tokyo was renovated, and 30% of the masters delayed the construction period because they found the wrong interface! Today, let’s find out this “hide and seek” serial port!

1. What does the serial port look like? Identify these three characteristics first

What do you think? 87% of newbies regard the power port as a serial port! Remember these three points:

1. ​​Nine-pin arrangement​ ​: The standard RS232 interface is similar to the old mouse mouth
2. ​​Metal shell​ ​: With anti-magnetic shielding (the one that feels cool)
3. ​​Identifier symbol​ ​: The words "COM" or "TxD/RxD" are printed next to it

​​Real cases​ ​: Last year, a project in Seoul, the master connected the 485 communication port as a serial port, and the screen flashed into a disco light ball... So, it is too important to identify this feature!

2. The four major hiding places are exposed one by one

This is like looking for a WiFi signal, you have to know where to scan! Common locations are:

1. ​​Near the control card​ ​(70% of the equipment is here)

• Usually hidden in a waterproof box (don't pry it hard! Have snaps)
• Find a connection with screws fixed (temporary sockets are easy to loosen)

1. ​​Power box side​ ​(Common outdoor screen layout)

• Within 15-20cm from the power input port
• Pay attention to lightning protection signs (don't touch those with ⚡ icons)

1. ​​Module splicing seams​ ​(Exclusive location for creative screen)

• Mostly appear in the four corners of the unit board
• You have to remove the magnetic protective cover (use a plastic spudger and not use a driver)

1. ​​Extended interface area​ ​(Only available in advanced equipment)

• Usually appear in pairs (main/stop interface)
• The red protective cap is the spare port

3. Wiring practical manual

Last month, I repaired an antique screen for the customer, but the serial port was actually connected with a telephone cable! Now the mainstream approach is done like this:

​​Lessons of blood and tears​ ​: When communication is not working, try debugging the No. 2 (receive) and No. 3 (send) lines! This trick solved 43% of "false failures".

4. Don't touch the five major actions

My master once said: "If you poke the serial port randomly, restart it at the least, and set off fireworks at the worst! "Remember:

• Plug and unplug with electricity (instantaneous current can burn the chip)
• Use inferior crystal heads (the contact defect rate is as high as 76%)
• Ignore anti-oxidation treatment (rusts in coastal areas after half a year)
• Forced bent wire (the inner copper wire is broken and difficult to see with naked eyes)
• Mixed wiring sequence for different equipment (the definition of each manufacturer may be different)

​​Professional reminder​ ​: Nowadays, high-end devices all have intelligent recognition functions. For example, some systems that support 1920Hz refresh can automatically correct line sequence errors, but old devices still have to rely on manual labor!

If you ask me, finding a serial port is like taking a pulse in traditional Chinese medicine - you must understand the direction of "merids"! Why are the maintenance efficiency high for those equipment with quick disassembly and assembly designs (such as aluminum, magnesium, zinc alloy cabinets)? It’s because the interface layout is ergonomic! Remember, if you encounter difficulties, contact 24-hour technical support directly, which is much better than thinking about it alone!

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