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Originally Posted by b_k
Hint: I'm searching for a non-invasive method to get access.
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Centuries ago it was usual to look for a RS232 long distance buffered I/O, easily found to comply with 12 volts. Now for a cradle connector the buffering and driving is in the cradle so it does not seem easy to distinguish from the other pins. You can discard USB and Power pins by looking in the travel connector thing, I suppose, and then concentrate in the pins the travel thing does not use.
An examination of the board does not help, as the connector does not have nearby components, and the only ones it has are in the other side of the board.