Then I do not think you have a null modem cable. Can you ohm out the cable (from end to end including adaptors since is looks like you have at least one adaptor)? Pin 2 on one side should be connected to pin 3 on the other and ping 3 should be connected to ping 2.
Thank you very match.
We construct the cable becouse the cable that we have bought wasn't crossover.
Additionaly we had the user locked and we could unlock it with the terminal.