Using the LS-XHL diagrams, http://buffalo.nas-central.org/wiki/Ser ... ort_LS-XHL
I tried unsoldering R253 on my LS-CHLv2, then realised that I didn't know what was meant by "For a (non AC coupled) UART port you have to short the vias underneath R253 with a 0R resistor". So instead I put back R253 (or actually, just soldered a wire across - since it's a 0Ohm "Resistor" I take it to mean that a piece of wire is the same). Anyway, for plan B I've tried connecting up a 3.3v -> 5v RS232 converter to my PC's serial port, and connecting the TXD, RXD & GND ports marked on the diagram above (on the edge of the board where the SATA connector lives).
Then trying to connect with minicom I get some response if I type on my keyboard, but all garbage. I've tried every possible combination of parity, stop bits, data bits @ 115200 baud, but I just get garbage. The fact that this bears some relationship to me typing (garbage characters are only generated when I type) suggests that I'm seeing some serial communication but it's not quite there yet: I get the garbage characters in response intermittently; I've tried other speeds and don't see any improvement (although ssh into the NAS suggests it's running at 115200 baud, esp. 'ps' showing "/sbin/getty -L ttyS0 115200 vt100" as running). I'm not getting *any* correct characters appearing though - what does appear is entirely garbage.
So that's FYI my progress. I'm currently using a jumble of serial cables, null modem, adapters to connect the Linkstation to the PC. This is such a mess, I'll try and get some wires & connectors together so that I can try eliminating all that clutter and see if I get better results.
Meanwhile I'll be very interested to hear anyone else's experiences...