RX TX cable orientation should be fine (I keep track of wire colour), but I also get Communication OK when swapping them. However, if I take one of the cables out, it no longer works.
I plug in my PS3 to the PC via the USB to TTL adapter (I used the "USB to TTL Serial Adapter CH340 chip Converter Module Debug Cable TTL to USB Serial Cable" on Amazon.com) and it says that communication with the Syscon is OK (keep in mind I don't use ground wires and the one time I did try it...