I have wasted a lot of time trying to get TSP-Link to work. I even bought an additional card for the DAQ6510.
I could not find any good docs on TSP: some basic illustrations showing daisy-chaining, telling me to use crossover Cat5 cables and set unique node numbers. Well, I've tried all that but must have missed something essential.
There is no marking for "in" or "out" on the TSP connectors. My best guess is that it is connector-xfmr-instrument-xfmr-connector, but I'm not sure.
Also, connecting >2 instruments always causes an error. I've used different cables and the strange thing is that identically connected cables give different results - some refuse to work. Any shielded (S/FTP) cable is a no-no. And, yes, I know how a crossover cable is wired, even from memory.