Does anyone know what kind of cable the thinline profiler uses? I recently acquired one of these profilers, but it came with no cables. I went out and bought a female to female serial cable, but it did not work. It will not communicate with my PC. Is it a special kind of cable? I found only RS232 Null modem cables at my electronics store. Are these the right kind of cables, or should I be looking for something different? Thanks for your help.