I bought an xm direct 2 mini-tuner and am hoping to get it working with my carpc. I have seen the usb cable option provided by mitchjs but I was wondering if a serial cable could be made like for the original xm direct unit? Based on the instructions for the original xm direct cable the only wires that would be important are the data in, data out, ground, and power? I have tried searching any schematics on the xm direct 2 connector. Has anybody made a simple serial cable or know where I can get more information on creating one?