Moin Mike, thanks for your answer.
I found the chapter, thanks for the pointer :-)
An other question (I can't experiment because the TS480 is 400 km away :-) If I go there soon everything should be fine.
The instructions say I need a cable with 2x female plugs on the Radio side. That fits, there is a male plug on the TS480, as well as on the RRC-1258 Mk II
That's why I used to use a USB to 9 pin Sub-D adapter with a female plug. On the control RRC-1258, COM2 is also a socket (female). That means I need a different USB adapter or a gender changer, right?
vy73 de Micha, DD0UL