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I could easily make the cable myself for dirt cheap since Flytec is nice enough to provide the pinouts of the cable in the manual, but I have never seen the socket that Flytec uses.

When all else fails, use brute force. If I were in your shoes, since I have the pinouts, I'd cut up the casing and solder my own standard serial port there, making it all rugged with generous helpings of hot glue. That way, the only thing between it and the host PC is a single easily-replaceable serial cable. Dongles break and fray too easily.

Now I like where you are heading, but I would take this one step less far.

I have become a great fan of common 4-conductor trailer connectors like yo. If there was room, I would JB Weld one of those inside the case and then fab a custom trailer-to-DB9 serial cable. The are pretty rugged, stay together, and don't stick out much.

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Or you could just jerry rig it.

OK, I was going to say "'jerry rig' or 'jury rig'?" but this interesting note suggests that neither may be the perfect fit! As a word-derivation Bitt I am a failure