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Also, according to Hugo, Mark 2 units with serial numbers below 1050 are be missing a ground wire on the in-car serial connector. To get them to work, you need to connect a ground wire between your laptop's serial cable shroud and a ground point on the vehicle. Another thing to remember is that the serial port on the docking sled is already "crossed over" with the RX and TX pins swapped. So you need to use a straight-through serial cable instead of the supplied null-modem cable if you're connecting your PC to the docking sled's serial connector.