Matthias: Yes, it is possible to push out a signal via PC -> TX -> RX, and back to the PC. I can see this happening in the X-CTU tool. I have not tried to connect a second PC to the RX (for the simple reason that I don't have a second cable with a DB9 and a USB ending). You were saying "start with the VOLA-SW pushing out data" - what is the SW you are referring to? If you are referring to SkiAlp-Pro, I tried that, by generating an impulse to the TIMY (which is connected to the PC). Under a cable connection, that impulse goes to the display, but it doesn't go when the connection is through these modems.