Serial communication (RX, TX) is not connected in Arduino Mega pro

Projects Networking, Protocols, and Devices
1

Hello everyone.
I bought Arduino Mega pro from AliExpress

ail express

A pin map and product description are shown in the hyperlink

There is nothing wrong with uploading and communicating using microusb.

But if I do serial communication with rx, tx while driving the board with 12v power on the vin, communication is not possible.

A TTL-RS232 converter with MAX3232 is being used.
(RX, TX, VIN(5V), GND Connecting All)
The board rate is 9600.

In the same situation, the original Arduino Mega or Uno works normally.
Only the mega pro board doesn't communicate at all.

Even if I change the code, converter, and mega pro board, it still doesn't communicate, so there seems to be a problem other than the code or product problem.

Have you ever experienced anything similar to me?

Please help me

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please show a clear picture of how you have connected the TTL-RS232 to your Mega PRO.
We must be able to clearly identify each wire from the Mega to the TTL-RS232

Furthermore - what have you connected to the RS232 side of yoru TTL-RS232 adapter?
Also this cable must do the RX/TX pin mapping correct.

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