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This is of course assuming that pin 8 is meant to be RX and pin 9 is meant to be TX, hence the system being designed to be a null modem. Can one of the designers confirm this?
RX and TX are swapped on the sled harness so it's the opposite of what's on the player body itself. Player itself requires crossed cable, sled harness requires straight-through cable because they're swapped. Covered here.
Naming the RX and TX lines in a standard way on a serial port is tricky because of the whole null modem situation. Do you name them according to what lines you're connecting to those pins, or according to what those pins do? And even then, those concepts shift depending on which end of the cable you're looking at. Personally I think the nomenclature of the individual pins is kind of arbitrary and you just have to know whether your connecting cable is straight or crossed.
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