I too am interested in this serial dongle; I'm trying to get my USA 919 to play some region 2 PAL DVDs I have... Blam1, any chance you have an oscilloscope with serial port decoding to grab the commands from it?
I did find this interesting little tidbit in the service manual, but changing that link had no effect for me... I tried it in combination with the 909 solder bridge and the usual DISPLAY remote trick to no avail.
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I also did try a serial-to-USB cable wired to that port, no luck either. I was hoping it might output something but it does not appear to, I see no signs of any activity with an oscilloscope.