Okay, from what I've gleaned, it seems as though the serial connector on the car docking sled is already "crossed over", i.e., TD to RD and vice-versa. Meaning that you can't use the supplied null-modem cable to connect to the car docking sled, you have to use a straight-through cable for that job. (If anyone can confirm this for sure, I'll add it to the FAQ.)

I'm trying to make an adapter plug that will allow me to connect the supplied null-modem cable to the serial port on the car docking sled. It works, but I have a problem.

When I am in Hyperterminal, each character I type is ddoouubblleedd lliikkee tthhiiss.. Everything else seems to work at the player's shell prompt except for this echo.

I know what you're thinking: Turn off local echo in Hyperterminal. But it's already turned off!

What have I wired wrong to cause this?

Here is what I have wired:

Pin1 = Pin1 (Carrier Detect)
Pin8 = Pin8 (Clear To Send)
Pin2 = Pin3 (Crossed Recieve/Transmit)
Pin3 = Pin2 (Crossed Transmit/Receive)

That's all.

When I make it 2=2 and 3=3 it doesn't work at all, so I know it's not that.

Any ideas?