My cable was crossed over as well, I had trouble finding a plug that actually had six of the pins present all only had two or four actual pin contacts, in the end I just cut the cable and soldered them in the right order as per the pin outs available on the net.
I had the same problem with a modified controller I bought s/h for the eq5 before I fitted the Synscan. Had to rewire it mirror image of its original config to get it to work. Gave me the same error as yours Alex, but it took me a while to work it out. The Shoestring gear seems to be good, works straight out of the box and reasonably priced too.