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I'm not quite certain what you're asking. You mention 'port' several times, but then in your example, you say the answer is /dev/ttyUSB0, which is a device dev path, not a port. So this answer is about finding the dev path for each device. Below is a quick and dirty script which walks through devices in /sys looking for USB devices with a ID_SERIAL ...


From your description the issue can be in two places, Tx pin on Linux box can be demaged, or Rx pin on custom board. I sugest to check serial port on Linux box and on custom board, by connecting Rx and Tx pin together on the same platform creating echo. This can show where problem is, on Linux box or on custom board. Have you tried using other wire, maybe ...

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